Radioactivity — Paper 1 · IGCSE Physics 0625

10 A power station uses nuclear fission to obtain energy. In this process, nuclear energy is first changed into A chemical energy. B electrical energy. C gravitational energy. D internal energy.

1 marks

Answer: D

This question in 0625/11 May/June 2005

38 Which type of radiation has the greatest ionising effect? A α-particles B β-particles C γ-rays D all have the same ionising effect

1 marks

Answer: A

This question in 0625/11 May/June 2005

39 A powder contains 400 mg of a radioactive material that emits α-particles. The half-life of the material is 5 days. What mass of that material remains after 10 days? A 0 mg B 40 mg C 100 mg D 200 mg

1 marks

Answer: C

This question in 0625/11 May/June 2005

38 A radioactive source emits radiation that can pass through a sheet of paper but not through thick aluminium. paper thick aluminium (all the radiation (none of the radiation passes through) passes through) radiation What does this show about the radiation? A It is α-particles. B It is β-particles. C It is γ-rays. D It is a mixture of α-particles and γ-rays.

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2005

39 An unstable nucleus has 145 neutrons and 92 protons. It emits a β-particle. How many neutrons and protons does the nucleus have after emitting the β-particle? neutrons protons A 144 92 B 144 93 C 145 91 D 145 93

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2005

38 The diagram shows five atoms in a radioactive substance. The atoms each give out an α-particle. 1st particle atom 1 atom atom 2 5 atom atom 4 3 2nd particle Atom 1 is the first to give out a particle. Atom 3 is the second to give out a particle. Which atom will give out the next particle? A atom 2 B atom 4 C atom 5 D impossible to tell

1 marks

Answer: D

This question in 0625/11 May/June 2006

39 A Geiger counter detects radiation from radioactive sources. A radioactive source is inside a thick aluminium container as shown. radioactive source 2 m Geiger counter thick aluminium container Which type of radiation from this source is being detected? A α-particles B β-particles C γ-rays D radio waves

1 marks

Answer: C

This question in 0625/11 May/June 2006

38 What are the most penetrating and the least penetrating types of radiation? most penetrating least penetrating A α-particles β-particles B β-particles α-particles C γ-rays α-particles D γ-rays β-particles

1 marks

Answer: C

This question in 0625/11 May/June 2007

39 The half-life of a radioactive substance is 5 hours. A sample is tested and found to contain 0.48 g of the substance. How much of the substance was present in the sample 20 hours before the sample was tested? A 0.03 g B 0.12 g C 1.92 g D 7.68 g

1 marks

Answer: D

This question in 0625/11 May/June 2007

38 A sheet of paper is placed between a radioactive source and a detector. radioactive detector source sheet of paper Which types of radiation can pass through the paper? A α-particles and β-particles only B α-particles and γ-rays only C β-particles and γ-rays only D α-particles, β-particles and γ-rays

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2007

39 A sample of radioactive isotope is decaying. The nuclei of which atoms will decay first? A impossible to know, because radioactive decay is random B impossible to know, unless the age of the material is known C atoms near the centre, because they are surrounded by more atoms D atoms near the surface, because the radiation can escape more easily

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2007

38 What is a β-particle and from which part of a radioactive atom is it emitted? β-particle emitted from A electron nucleus B electron outer orbits C helium nucleus nucleus D helium nucleus outer orbits

1 marks

Answer: A

This question in 0625/11 May/June 2008

39 A sample of radioactive uranium has mass 1 g. Another sample of the same material has mass 2 g. Which property is the same for both samples? A the amount of radiation emitted per second B the half-life C the number of uranium atoms D the volume

1 marks

Answer: B

This question in 0625/11 May/June 2008

38 The diagram shows an experiment to monitor the radiation from a radioactive gas. The counter readings are corrected for background radiation. counter 000.0 radioactive gas The table shows how the counter reading varies with time. time / seconds 0 20 40 60 80 100 120 140 160 180 counter reading / 140 105 82 61 44 36 27 20 15 10 counts per minute What is the half-life of the gas? A between 20 and 40 seconds B between 40 and 60 seconds C between 60 and 140 seconds D between 140 and 180 seconds

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2008

39 Which material is commonly used as a lining for a box for storing radioactive samples? A aluminium B copper C lead D uranium

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2008

40 A uranium 238 U nucleus emits an α-particle. 92 What are the new nucleon and proton numbers? nucleon number proton number A 238 88 B 236 90 C 234 92 D 234 90

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2008

38 A radioactive nucleus contains 138 neutrons. The nucleus emits an α-particle. How many neutrons are in the nucleus after it has emitted the α-particle? A 134 B 136 C 138 D 139

1 marks

Answer: B

This question in 0625/11 May/June 2009

39 The graph shows the decay curve for one particular radioactive nuclide. 2500 count rate counts / min 2000 1500 1000 500 0 0 1 2 3 4 5 time / days What is the half-life of this nuclide? A 1.0 day B 1.5 days C 2.0 days D 2.5 days

1 marks

Answer: C

This question in 0625/11 May/June 2009

40 16 N is the symbol for a particular nuclide of nitrogen. 7 How many nucleons does this nuclide contain? A 7 B 9 C 16 D 23

1 marks

Answer: C

This question in 0625/11 May/June 2009

38 Which statement explains the meaning of the half-life of a radioactive substance? A half the time taken for half the substance to decay B half the time taken for the substance to decay completely C the time taken for half the substance to decay D the time taken for the substance to decay completely

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2009

39 The diagram shows the paths of three different types of radiation, X, Y and Z. X Y Z 2 mm of 10 mm lead plastic of aluminium Which row in the table correctly identifies X, Y and Z? X Y Z A α-particles β-particles γ-rays B β-particles α-particles γ-rays C β-particles γ-rays α-particles D γ-rays α-particles β-particles Question 40 is on the next page.

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2009

39 Which statement explains the meaning of the half-life of a radioactive substance? A half the time taken for half the substance to decay B half the time taken for the substance to decay completely C the time taken for half the substance to decay D the time taken for the substance to decay completely

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2009

40 The diagram shows the paths of three different types of radiation, X, Y and Z. X Y Z 2 mm of 10 mm lead plastic of aluminium Which row in the table correctly identifies X, Y and Z? X Y Z A α-particles β-particles γ-rays B β-particles α-particles γ-rays C β-particles γ-rays α-particles D γ-rays α-particles β-particles

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2009

38 Which row describes the properties of α-particles? ionizing radiation stopped effect by aluminium? A large no B large yes C small no D small yes

1 marks

Answer: B

This question in 0625/11 May/June 2010

39 A radioactive substance has a half-life of 2 weeks. At the beginning of an investigation the substance emits 3000 β-particles per minute. How many β-particles will it emit per minute after 6 weeks? A 0 B 375 C 500 D 1500

1 marks

Answer: B

This question in 0625/11 May/June 2010

37 A radioactive substance has a half-life of 2 weeks. At the beginning of an investigation the substance emits 3000 β-particles per minute. How many β-particles will it emit per minute after 6 weeks? A 0 B 375 C 500 D 1500

1 marks

Answer: B

This question in 0625/12 May/June 2010

38 Which row describes the properties of α-particles? ionizing radiation stopped effect by aluminium? A large no B large yes C small no D small yes

1 marks

Answer: B

This question in 0625/12 May/June 2010

38 A radioactive element has a half-life of 70 s. The number of emissions per second, N, of a sample of the element is measured at a certain time. What was the number of emissions per second 70 s earlier? A 0 B N / 2 C N D 2N

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2010

39 S is a radioactive source emitting α-particles, β-particles and γ-rays. A detector is placed 5 cm away from S. A thin sheet of paper is placed as shown in the diagram. thin sheet of paper S detector 5 cm Which radiations can be detected? A α-particles and β-particles only B α-particles and γ-rays only C β-particles and γ-rays only D α-particles, β-particles and γ-rays

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2010

39 S is a radioactive source emitting α-particles, β-particles and γ-rays. A detector is placed 5 cm away from S. A thin sheet of paper is placed as shown in the diagram. thin sheet of paper S detector 5 cm Which radiations can be detected? A α-particles and β-particles only B α-particles and γ-rays only C β-particles and γ-rays only D α-particles, β-particles and γ-rays

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2010

40 A radioactive element has a half-life of 70 s. The number of emissions per second, N, of a sample of the element is measured at a certain time. What was the number of emissions per second 70 s earlier? A 0 B N / 2 C N D 2N

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2010

38 S is a radioactive source emitting α-particles, β-particles and γ-rays. A detector is placed 5 cm away from S. A thin sheet of paper is placed as shown in the diagram. thin sheet of paper S detector 5 cm Which radiations can be detected? A α-particles and β-particles only B α-particles and γ-rays only C β-particles and γ-rays only D α-particles, β-particles and γ-rays

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2010

39 A radioactive element has a half-life of 70 s. The number of emissions per second, N, of a sample of the element is measured at a certain time. What was the number of emissions per second 70 s earlier? A 0 B N / 2 C N D 2N

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2010

38 Which row shows the relative ionising effects and penetrating abilities of α-particles and β-particles? ionising effect penetrating ability A α greater than β α greater than β B α greater than β α less than β C α less than β α greater than β D α less than β α less than β

1 marks

Answer: B

This question in 0625/11 May/June 2011

39 A powder contains 400 mg of a radioactive material that emits α-particles. The half-life of the material is 5 days. What mass of that material remains after 10 days? A 0 mg B 40 mg C 100 mg D 200 mg

1 marks

Answer: C

This question in 0625/11 May/June 2011

37 A powder contains 400 mg of a radioactive material that emits α-particles. The half-life of the material is 5 days. What mass of that material remains after 10 days? A 0 mg B 40 mg C 100 mg D 200 mg

1 marks

Answer: C

This question in 0625/12 May/June 2011

38 Which row shows the relative ionising effects and penetrating abilities of α-particles and β-particles? ionising effect penetrating ability A α greater than β α greater than β B α greater than β α less than β C α less than β α greater than β D α less than β α less than β

1 marks

Answer: B

This question in 0625/12 May/June 2011

37 A powder contains 400 mg of a radioactive material that emits α-particles. The half-life of the material is 5 days. What mass of that material remains after 10 days? A 0 mg B 40 mg C 100 mg D 200 mg

1 marks

Answer: C

This question in 0625/13 May/June 2011

38 Which row shows the relative ionising effects and penetrating abilities of α-particles and β-particles? ionising effect penetrating ability A α greater than β α greater than β B α greater than β α less than β C α less than β α greater than β D α less than β α less than β

1 marks

Answer: B

This question in 0625/13 May/June 2011

9 A power station uses nuclear fission to obtain energy. In this process, nuclear energy is first changed into A chemical energy. B electrical energy. C gravitational energy. D thermal (heat) energy.

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2012

38 How does the ionising effect of α-particles compare with that of β-particles and γ-rays? compared with β-particles compared with γ-rays A α-particles are less strongly ionising α-particles are less strongly ionising B α-particles are less strongly ionising α-particles are more strongly ionising C α-particles are more strongly ionising α-particles are less strongly ionising D α-particles are more strongly ionising α-particles are more strongly ionising

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2012

39 The table shows the count rates obtained from four radioactive sources. The measurements were taken at noon on four consecutive days. Which source has the longest half-life? count rate /.counts per second day 1 day 2 day 3 day 4 A 100 48 27 11 B 200 142 99 69 C 300 297 292 290 D 400 202 99 48

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2012

39 How does the ionising effect of α-particles compare with that of β-particles and γ-rays? compared with β-particles compared with γ-rays A α-particles are less strongly ionising α-particles are less strongly ionising B α-particles are less strongly ionising α-particles are more strongly ionising C α-particles are more strongly ionising α-particles are less strongly ionising D α-particles are more strongly ionising α-particles are more strongly ionising

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2012

40 The table shows the count rates obtained from four radioactive sources. The measurements were taken at noon on four consecutive days. Which source has the longest half-life? count rate /.counts per second day 1 day 2 day 3 day 4 A 100 48 27 11 B 200 142 99 69 C 300 297 292 290 D 400 202 99 48

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2012

9 A power station uses nuclear fission to obtain energy. In this process, nuclear energy is first changed into A chemical energy. B electrical energy. C gravitational energy. D thermal (heat) energy.

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2012

38 How do the ionising effect and the penetrating ability of α-particles compare with those of β- particles and γ-rays? ionising penetrating effect ability A higher higher B higher lower C lower higher D lower lower

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2012

39 A student is investigating how the radiation from a radioactive source changes with time. The table shows the results from the detector. time count-rate / / min counts per min 0 340 2 180 4 100 6 60 8 40 The experiment is repeated by other students, who also measure the count-rate every two minutes. The half-life of the source is known to be exactly two minutes. Why is the measured count-rate always higher than half the previous value? A Radioactive emissions occur randomly with time. B The detector used is very close to the source. C There is background radiation present. D The radioactive source is decaying.

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2012

40 Which of the following is not a charged particle? A α-particle B β-particle C neutron D proton

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2012

39 The graph shows how the count rate on a detector due to a radioactive source changes with time. 4800 count rate counts per minute 2400 0 0 1 2 3 4 5 time / hours What is the count rate at 5.0 hours? A 960 counts per minute B 600 counts per minute C 150 counts per minute D 0 counts per minute

1 marks

Answer: C

This question in 0625/11 May/June 2013

39 A radiation detector is placed close to a source of β-particles. Aluminium sheets of increasing thickness are placed between the source and the detector. source of β-particles aluminium sheet detector Eventually a sheet which is 2.0 cm thick is used. The reading on the detector decreases, but does not fall to zero. Why does the reading not fall to zero? A Some of the β-particles go round the edges of the sheet. B The detector is too close to the source. C There is always some background radiation. D The sheet can never be thick enough to absorb all the β-particles.

1 marks

Answer: C

This question in 0625/12 May/June 2013

40 The graph shows how the count rate on a detector due to a radioactive source changes with time. 4800 count rate counts per minute 2400 0 0 1 2 3 4 5 time / hours What is the count rate at 5.0 hours? A 960 counts per minute B 600 counts per minute C 150 counts per minute D 0 counts per minute

1 marks

Answer: C

This question in 0625/13 May/June 2013

39 A radioactive substance emits a particle from the nucleus of one of its atoms. The particle consists of two protons and two neutrons. What is the name of this process? A α-emission B β-emission C γ-emission D nuclear fission

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2013

38 A radioactive substance emits a particle from the nucleus of one of its atoms. The particle consists of two protons and two neutrons. What is the name of this process? A α-emission B β-emission C γ-emission D nuclear fission

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2013

39 Why are some radioactive sources stored in boxes made from lead? A Lead absorbs emissions from the radioactive sources. B Lead decreases the half-life of radioactive sources. C Lead increases the half-life of radioactive sources. D Lead repels emissions from the radioactive sources.

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2013

38 The table shows the results of an experiment to find the half-life of a radioactive substance. count rate from substance time / s counts / second 0 150 60 120 120 95 180 75 240 60 What is the half-life of the substance? A 60 seconds B 120 seconds C 180 seconds D 240 seconds

1 marks

Answer: C

This question in 0625/11 May/June 2014

39 The diagram shows a box used for storing radioactive sources. Which material is best for lining the box to prevent the escape of most radioactive emissions? A aluminium B copper C lead D steel

1 marks

Answer: C

This question in 0625/11 May/June 2014

38 Compared with β-particles and γ-rays, α-particles A are the only type of radiation to carry a charge. B have the greatest ionising effect. C have the greatest penetrating effect. D have the smallest mass.

1 marks

Answer: B

This question in 0625/12 May/June 2014

39 The diagram shows a box used for storing radioactive sources. Which material is best for lining the box to prevent the escape of most radioactive emissions? A aluminium B copper C lead D steel

1 marks

Answer: C

This question in 0625/12 May/June 2014

38 The diagram shows a box used for storing radioactive sources. Which material is best for lining the box to prevent the escape of most radioactive emissions? A aluminium B copper C lead D steel

1 marks

Answer: C

This question in 0625/13 May/June 2014

39 The table shows the results of an experiment to find the half-life of a radioactive substance. count rate from substance time / s counts / second 0 150 60 120 120 95 180 75 240 60 What is the half-life of the substance? A 60 seconds B 120 seconds C 180 seconds D 240 seconds

1 marks

Answer: C

This question in 0625/13 May/June 2014

38 The diagram shows a radioactive source, a thick aluminium sheet and a radiation detector. radioactive thick aluminium radiation detector source sheet The radiation detector shows a reading greater than the background reading. Which type of radiation is being emitted by the source and detected by the detector? A α-radiation B β-radiation C γ-radiation D infra-red radiation

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2014

39 The count rate from a radioactive isotope is recorded every hour. The count rate is corrected for background radiation. The table shows the readings. time / hours 0 1 2 3 4 5 corrected count rate 800 620 480 370 290 220 counts / s What estimate of the half-life of the isotope can be obtained from the readings in the table? A between 1 and 2 hours B between 2 and 3 hours C between 3 and 4 hours D between 4 and 5 hours

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2014

37 The diagram shows a radioactive source, a thick aluminium sheet and a radiation detector. radioactive thick aluminium radiation detector source sheet The radiation detector shows a reading greater than the background reading. Which type of radiation is being emitted by the source and detected by the detector? A α-radiation B β-radiation C γ-radiation D infra-red radiation

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2014

38 The count rate from a radioactive isotope is recorded every hour. The count rate is corrected for background radiation. The table shows the readings. time / hours 0 1 2 3 4 5 corrected count rate 800 620 480 370 290 220 counts / s What estimate of the half-life of the isotope can be obtained from the readings in the table? A between 1 and 2 hours B between 2 and 3 hours C between 3 and 4 hours D between 4 and 5 hours

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2014

38 A radioactive source emits three types of radiation R, S and T. The diagram shows an experiment set up to study the penetrating properties of R, S and T. R S T paper few mm of few cm aluminium of lead Which types of radiation are R, S and T? R S T A α-particles β-particles γ-rays B α-particles γ-rays β-particles C β-particles α-particles γ-rays D γ-rays β-particles α-particles

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2014

39 The half-life of a radioactive substance is 10 minutes. A sample of the radioactive substance contains 2000 nuclei. How many radioactive nuclei were in the sample half an hour earlier? A 250 B 4000 C 6000 D 16 000

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2014

38 Which row shows the relative ionising effects and penetrating abilities of α-particles and β-particles? ionising effect penetrating ability A α greater than β α greater than β B α greater than β α less than β C α less than β α greater than β D α less than β α less than β

1 marks

Answer: B

This question in 0625/12 Feb/March 2015

39 A radioactive substance has a half-life of 2 weeks. At the beginning of an investigation, a sample of the substance emits 3000 β-particles per minute. How many β-particles will it emit per minute after 6 weeks? A 0 B 375 C 500 D 1500

1 marks

Answer: B

This question in 0625/12 Feb/March 2015

38 Which row gives the properties of the radiation from radioactive materials? most penetrating radiation most highly ionising radiation A α β B β γ C γ α D γ γ

1 marks

Answer: C

This question in 0625/11 May/June 2015

39 In a laboratory, a detector of ionising radiation records an average background count rate of 8 counts per second. detector counts / s A radioactive source is now placed close to the detector. The count rate on the detector rises to 200 counts per second. detector counts / s radioactive source What is the count rate due to radiation from the radioactive source? A 25 counts / s B 192 counts / s C 200 counts / s D 208 counts / s

1 marks

Answer: B

This question in 0625/11 May/June 2015

8 Which source of energy involves the splitting of heavy atoms? A chemical energy B geothermal energy C hydroelectric energy D nuclear energy

1 marks

Answer: D

This question in 0625/12 May/June 2015

38 Which statement about α-radiation is correct? A It is a stream of fast-moving electrons. B It is a form of electromagnetic radiation. C It is more highly ionising than γ-radiation. D It is more penetrating than β-radiation.

1 marks

Answer: C

This question in 0625/12 May/June 2015

39 A radioactive source produces a count rate on a detector of 1600 counts / s. After 32 hours the count rate has fallen to 100 counts / s. Both count rates have been corrected for background radiation. What is the half-life of the source? A 2.0 hours B 6.4 hours C 8.0 hours D 16 hours

1 marks

Answer: C

This question in 0625/12 May/June 2015

38 α, β and γ-radiations are emitted by radioactive substances. Which statement is correct? A α-radiation consists of charged particles and is the most highly ionising radiation. B β-radiation consists of charged particles and is the most penetrating radiation. C β-radiation consists of uncharged particles and is the least highly ionising radiation. D γ-radiation consists of uncharged particles and is the least penetrating radiation.

1 marks

Answer: A

This question in 0625/13 May/June 2015

39 The nucleus of an americium atom contains 146 neutrons and 95 protons. It decays by emitting an α-particle. How many neutrons and how many protons remain in the nucleus when this form of americium decays? number of neutrons number of protons remaining remaining A 142 93 B 142 95 C 144 93 D 144 95

1 marks

Answer: C

This question in 0625/13 May/June 2015

38 A uranium 238 U nucleus emits an α-particle. 92 What are the new nucleon and proton numbers? nucleon number proton number A 238 88 B 236 90 C 234 92 D 234 90

1 marks

Answer: D

This question in 0625/14 May/June 2015

39 Which row shows the nature and the penetrating ability of β-particles? nature most are stopped by A electron a few mm of aluminium B electron a thin sheet of paper C helium nucleus a few mm of aluminium D helium nucleus a thin sheet of paper

1 marks

Answer: A

This question in 0625/14 May/June 2015

40 A radioactive isotope is placed near a detector. The readings on the detector are corrected for background radiation and recorded every hour. The table shows the corrected readings. time / hours 0 1.0 2.0 3.0 4.0 count rate / counts per second 500 375 280 210 160 What is the half-life of the isotope? A between 0 and 1 hour B between 1 hour and 2 hours C between 2 hours and 3 hours D between 3 hours and 4 hours

1 marks

Answer: C

This question in 0625/14 May/June 2015

38 The nuclide symbol for radioactive polonium is 210 Po . 84 A nucleus of this type of polonium emits an α-particle. What is the proton number (atomic number) of the nucleus after it has emitted the α-particle? A 82 B 83 C 84 D 85

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2015

39 A student investigates how the radiation from a radioactive source changes with time. The table shows the results from the detector used by the student. time / count rate / minutes counts per minute 0 340 2.0 180 4.0 100 6.0 60 8.0 40 The experiment is repeated by many other students, who also measure the count rate every two minutes. The half-life of the source is known to be exactly 2.0 minutes. Why is the measured count rate always greater than half the previous value? A Radioactive emissions occur randomly with time. B The detector used is very close to the source. C There is background radiation present. D The radioactive source is decaying.

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2015

9 Electrical energy may be obtained from nuclear fission. In which order is the energy transferred in this process? A nuclear fuel → generator → reactor and boiler → turbines B nuclear fuel → generator → turbines → reactor and boiler C nuclear fuel → reactor and boiler → generator → turbines D nuclear fuel → reactor and boiler → turbines → generator

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2015

38 Radioactive carbon-14 decays into nitrogen by emitting a β-particle. The equation below represents the decay. 14 C → N 14 7 + β Q 0 P What are the values of P and Q? P Q A 6 1 B 6 –1 C 8 1 D 8 –1

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2015

39 A student investigates how the radiation from a radioactive source changes with time. The table shows the results from the detector used by the student. time / count rate / minutes counts per minute 0 340 2.0 180 4.0 100 6.0 60 8.0 40 The experiment is repeated by many other students, who also measure the count rate every two minutes. The half-life of the source is known to be exactly 2.0 minutes. Why is the measured count rate always greater than half the previous value? A Radioactive emissions occur randomly with time. B The detector used is very close to the source. C There is background radiation present. D The radioactive source is decaying.

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2015

9 Electrical energy may be obtained from nuclear fission. In which order is the energy transferred in this process? A nuclear fuel → generator → reactor and boiler → turbines B nuclear fuel → generator → turbines → reactor and boiler C nuclear fuel → reactor and boiler → generator → turbines D nuclear fuel → reactor and boiler → turbines → generator

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2015

38 A radioactive nucleus contains 128 nucleons. It emits a β-particle. How many nucleons are now in the nucleus? A 124 B 127 C 128 D 129

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2015

39 A student investigates how the radiation from a radioactive source changes with time. The table shows the results from the detector used by the student. time / count rate / minutes counts per minute 0 340 2.0 180 4.0 100 6.0 60 8.0 40 The experiment is repeated by many other students, who also measure the count rate every two minutes. The half-life of the source is known to be exactly 2.0 minutes. Why is the measured count rate always greater than half the previous value? A Radioactive emissions occur randomly with time. B The detector used is very close to the source. C There is background radiation present. D The radioactive source is decaying.

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2015

40 The nuclide notation for radium-226 is 226 Ra . 88 How many electrons orbit the nucleus of a neutral atom of radium-226? A 0 B 88 C 138 D 226

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2015

39 A scientist carries out an experiment using a sealed source which emits β-particles. The range of the β-particles in the air is about 30 cm. Which precaution is the most effective to protect the scientist from the radiation? A handling the source with long tongs B keeping the temperature of the source low C opening all windows in the laboratory D washing his hands before leaving the laboratory

1 marks

Answer: A

This question in 0625/12 Feb/March 2016

40 Which row describes the nature of α-particles and of γ-rays? α-particles γ-rays A helium nuclei electromagnetic radiation B helium nuclei electrons C protons electromagnetic radiation D protons electrons

1 marks

Answer: A

This question in 0625/12 Feb/March 2016

39 A radioactive nucleus emits either an α-particle or a β-particle. What are the products of these two types of radioactive emission? product after α-emission product after β-emission A a nucleus of a different element a nucleus of a different element B a nucleus of a different element a nucleus of the same element C a nucleus of the same element a nucleus of a different element D a nucleus of the same element a nucleus of the same element

1 marks

Answer: A

This question in 0625/11 May/June 2016

40 A reading is taken every 10 minutes of the number of emissions per second from a radioactive source. The table shows the readings. number of time / min emissions per second 0 800 10 560 20 400 30 280 40 200 50 140 60 100 What is the half-life of the source? A 10 min B 20 min C 40 min D 60 min

1 marks

Answer: B

This question in 0625/11 May/June 2016

39 Which row describes the nature and a property of all β-particles? nature property A electrons can travel through a vacuum B electrons stopped by a thin sheet of paper C helium nuclei can travel through a vacuum D helium nuclei stopped by a thin sheet of paper

1 marks

Answer: A

This question in 0625/12 May/June 2016

40 The graph shows how the decay rate of a radioactive source changes with time. 4000 decay rate 3000 decays / s 2000 1000 0 0 2 4 6 8 10 time / days What will be the activity at 8 days? A 0 decays / s B 125 decays / s C 250 decays / s D 500 decays / s

1 marks

Answer: C

This question in 0625/12 May/June 2016

39 Radioactive materials should be handled carefully. Which safety precaution does not reduce the risk to people using a radioactive material? A keeping the material a long distance from people B keeping the material at a low temperature C using lead screening between the material and people D using the material for only a short time

1 marks

Answer: B

This question in 0625/13 May/June 2016

40 A sample of a radioactive isotope has an initial rate of emission of 128 counts per minute and a half-life of 4 days. How long will it take for the rate of emission to fall to 32 counts per minute? A 2 days B 4 days C 8 days D 12 days

1 marks

Answer: C

This question in 0625/13 May/June 2016

17 Changes in which physical property cannot be used for temperature measurement? A decay rate of a radioactive source B electrical resistance of a solid C pressure of a gas D volume of a liquid

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2016

38 Radioactive materials may emit α-particles or β-particles. Which statement about the effect of these emissions is correct? A Both α-particles and β-particles cause the nucleus to change into that of a different chemical element. B Neither α-particles nor β-particles cause the nucleus to change into that of a different chemical element. C Only α-particles cause the nucleus to change into that of a different chemical element. D Only β-particles cause the nucleus to change into that of a different chemical element.

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2016

39 Radioactive source S emits α-particles, β-particles and γ-rays. A detector is placed 5 cm away from S. A thin sheet of paper is placed as shown in the diagram. thin sheet of paper S detector 5 cm Which emissions from the source can be detected? A α-particles and β-particles only B α-particles and γ-rays only C β-particles and γ-rays only D α-particles, β-particles and γ-rays

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2016

40 The half-life of a radioactive nuclide is 2.0 hours. The decay rate of a sample of this nuclide is measured at 1.0 hour intervals. The table shows the measurements, with one value shown as X. time / decay rate hours decays / s 0 240 1.0 170 2.0 120 3.0 85 4.0 X What is the most likely value of X? A 15 B 42 C 50 D 60

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2016

38 Which is the most effective precaution to reduce the risk when handling, storing or using a radioactive source that emits γ-rays? A Handle the source for the least possible time. B Have a fire extinguisher nearby when using the source. C Store the source at a low temperature. D Wear plastic safety goggles when handling the source.

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2016

39 Radioactive source S emits α-particles, β-particles and γ-rays. A detector is placed 5 cm away from S. A thin sheet of paper is placed as shown in the diagram. thin sheet of paper S detector 5 cm Which emissions from the source can be detected? A α-particles and β-particles only B α-particles and γ-rays only C β-particles and γ-rays only D α-particles, β-particles and γ-rays

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2016

40 A radioactive source has a half-life of 3.0 days. It emits radiation at a rate of 1200 particles per minute. At what rate was it emitting radiation 6.0 days earlier? A 300 particles per minute B 2400 particles per minute C 4800 particles per minute D 7200 particles per minute

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2016

39 Radioactive source S emits α-particles, β-particles and γ-rays. A detector is placed 5 cm away from S. A thin sheet of paper is placed as shown in the diagram. thin sheet of paper S detector 5 cm Which emissions from the source can be detected? A α-particles and β-particles only B α-particles and γ-rays only C β-particles and γ-rays only D α-particles, β-particles and γ-rays

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2016

40 A radioactive material emits α-particles. The table shows the rate of emission of α-particles from the material at different times. time rate of emission / hours / particles per minute 0.0 160 4.0 40 8.0 What is the half-life of the material and what is the missing value at 8.0 hours? half-life rate of emission at 8.0 hours / hours / particles per minute A 2.0 0 B 2.0 10 C 4.0 0 D 4.0 10

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2016

39 A radioactive substance emits radiation at a rate of 600 emissions per second. Four hours later, it emits radiation at a rate of 300 emissions per second. What is the half-life of the substance and what is the rate of emission after a further four hours? rate of emission after half-life / hours a further four hours / emissions per second A 2 0 B 2 150 C 4 0 D 4 150

1 marks

Answer: D

This question in 0625/12 Feb/March 2017

40 A radioactive source is placed near a detector. The radiation arriving at the detector from the source is measured for 10 minutes with different materials placed between the source and the detector. materials placed here radioactive detector source (Geiger-Müller tube) material between radiation detected source and detector / counts none 5626 sheet of paper 5629 thick sheet of aluminium 2226 thick sheet of lead 255 Which types of radiation are emitted by the source? A α-particles and γ-rays B α-particles only C β-particles and γ-rays D β-particles only

1 marks

Answer: C

This question in 0625/12 Feb/March 2017

39 A hospital doctor is using a source of γ-rays for a medical treatment. Each diagram shows a view from above of the treatment room. Which diagram shows the best way to protect the doctor and staff in the corridor from the γ-rays? A B dense dense source concrete concrete source doctor of γ-rays of γ-rays wooden wooden door door corridor corridor doctor C D dense dense concrete concrete doctor source source of γ-rays wooden of γ-rays door corridor wooden corridor doctor door

1 marks

Answer: D

This question in 0625/11 May/June 2017

40 A sample of radioactive isotope is decaying. The nuclei of which atoms will decay first? A It is impossible to know because radioactive decay is random. B It is impossible to know unless the age of the material is known. C The atoms near the centre will decay first because they are surrounded by more atoms. D The atoms near the surface will decay first because the radiation can escape more easily.

1 marks

Answer: A

This question in 0625/11 May/June 2017

39 A sample of radioactive isotope is decaying. The nuclei of which atoms will decay first? A It is impossible to know because radioactive decay is random. B It is impossible to know unless the age of the material is known. C The atoms near the centre will decay first because they are surrounded by more atoms. D The atoms near the surface will decay first because the radiation can escape more easily.

1 marks

Answer: A

This question in 0625/12 May/June 2017

40 The half-life of a radioactive isotope is 4.0 years. A sample of this material contains 24 million radioactive nuclei. How many of these radioactive nuclei remain undecayed after 12 years? A 0.5 million B 2.0 million C 3.0 million D 6.0 million

1 marks

Answer: C

This question in 0625/12 May/June 2017

9 In which power station are atoms of one element changed to atoms of other lighter elements? A a coal-fired power station B a hydroelectric power station C a nuclear power station D a solar power station

1 marks

Answer: C

This question in 0625/13 May/June 2017

39 A sample of radioactive isotope is decaying. The nuclei of which atoms will decay first? A It is impossible to know because radioactive decay is random. B It is impossible to know unless the age of the material is known. C The atoms near the centre will decay first because they are surrounded by more atoms. D The atoms near the surface will decay first because the radiation can escape more easily.

1 marks

Answer: A

This question in 0625/13 May/June 2017

40 The diagram shows a decay curve for a radioactive substance. 50 count rate 45 counts / s 40 35 30 25 20 15 10 5 0 0 time According to the curve shown, what is the background radiation count? A 40 counts / s B 20 counts / s C 5 counts / s D 0 counts / s

1 marks

Answer: C

This question in 0625/13 May/June 2017

39 A radioactive source emits three types of radiation R, S and T. The diagram shows an experiment set up to study the penetrating properties of R, S and T. R S T paper few mm of few cm aluminium of lead Which types of radiation are R, S and T? R S T A α-particles β-particles γ-rays B α-particles γ-rays β-particles C β-particles α-particles γ-rays D γ-rays β-particles α-particles

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2017

40 What is meant by the half-life of a radioactive isotope? A half of the time taken for all of the original nuclei to decay B the time taken for half of the original nuclei to decay C the time taken for the charges on all the nuclei to halve D the time taken for the mass of each nucleus to halve

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2017

39 A radioactive source emits three types of radiation R, S and T. The diagram shows an experiment set up to study the penetrating properties of R, S and T. R S T paper few mm of few cm aluminium of lead Which types of radiation are R, S and T? R S T A α-particles β-particles γ-rays B α-particles γ-rays β-particles C β-particles α-particles γ-rays D γ-rays β-particles α-particles

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2017

40 A radioactive source has a half-life of 0.5 hours. A detector near the source shows a reading of 6000 counts per second. Background radiation can be ignored. What is the reading on the detector 1.5 hours later? A 750 counts per second B 1500 counts per second C 2000 counts per second D 3000 counts per second

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2017

39 A radioactive source emits three types of radiation R, S and T. The diagram shows an experiment set up to study the penetrating properties of R, S and T. R S T paper few mm of few cm aluminium of lead Which types of radiation are R, S and T? R S T A α-particles β-particles γ-rays B α-particles γ-rays β-particles C β-particles α-particles γ-rays D γ-rays β-particles α-particles

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2017

40 Radioactive iodine-131 emits β-particles and has a half-life of 8 days. It decays to produce xenon-131. Which statement about this decay is correct? A After 8 days no more β-particles are emitted. B After 8 days the number of xenon-131 atoms has halved. C After 16 days the iodine-131 has decayed completely. D After 16 days the number of iodine-131 atoms has reduced to one quarter.

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2017

39 Which statement about α-particles and β-particles is correct? A α-particles are less ionising than β-particles. B α-particles are more penetrating than β-particles. C α-particles have greater mass than β-particles. D α-particles have the same charge as β-particles.

1 marks

Answer: C

This question in 0625/11 May/June 2018

40 An explosion in a nuclear reactor spread the isotope caesium-137 across a large area. Ninety years after the explosion, the quantity of caesium-137 present will be 12.5% of its original level. What is the half-life of caesium-137? A 11.25 years B 22.5 years C 30.0 years D 45.0 years

1 marks

Answer: C

This question in 0625/11 May/June 2018

39 The table compares the penetrating abilities and ionising effects of α-radiation and of γ-radiation. Which row is correct? least most penetrating ionising A α α B α γ C γ α D γ γ

1 marks

Answer: A

This question in 0625/12 May/June 2018

40 Radioactive materials must be handled in a safe way. What is not a safety procedure? A Monitor exposure time to radioactive materials. B Store radioactive materials in cardboard boxes. C Use tongs to pick up the radioactive source. D Wear protective clothing.

1 marks

Answer: B

This question in 0625/12 May/June 2018

39 Three sources of background radiation are listed. 1 cosmic rays 2 medical X-rays 3 radioactive emissions from radon gas from the ground Which of these sources are naturally occurring? A 1 and 3 only B 1 only C 2 and 3 only D 2 only

1 marks

Answer: A

This question in 0625/13 May/June 2018

40 The rates of emission from four radioactive sources are measured at 20 minute intervals. Each row in the table shows the results for one of the radioactive sources. Which source has the longest half-life? rate of emission / emissions per minute time 0 time 20 min time 40 min A 120 60 30 B 120 110 101 C 240 60 15 D 240 170 122

1 marks

Answer: B

This question in 0625/13 May/June 2018

39 The diagram shows the paths of three different types of radiation X, Y and Z. X Y Z 2 mm of 10 mm of 50 mm plastic aluminium of lead Which row correctly identifies X, Y and Z? X Y Z A α-particles β-particles γ-rays B β-particles α-particles γ-rays C β-particles γ-rays α-particles D γ-rays α-particles β-particles

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2018

40 A sample of a radioactive isotope emits 9600 α-particles per second. After 40 hours the rate of emission has fallen to 600 α-particles per second. What is the half-life of this isotope? A 4.0 hours B 8.0 hours C 10 hours D 20 hours

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2018

39 The diagram shows the paths of three different types of radiation X, Y and Z. X Y Z 2 mm of 10 mm of 50 mm plastic aluminium of lead Which row correctly identifies X, Y and Z? X Y Z A α-particles β-particles γ-rays B β-particles α-particles γ-rays C β-particles γ-rays α-particles D γ-rays α-particles β-particles

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2018

40 Samples of four different radioactive isotopes all emit radiation at the same rate. As time passes, the rates of emission decrease for all the samples. Which sample of isotope has the greatest decrease in rate? isotope half-life A americium-241 470 years B iodine-128 25 minutes C thoron-220 54.5 seconds D uranium-237 6.75 days

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2018

39 The diagram shows the paths of three different types of radiation X, Y and Z. X Y Z 2 mm of 10 mm of 50 mm plastic aluminium of lead Which row correctly identifies X, Y and Z? X Y Z A α-particles β-particles γ-rays B β-particles α-particles γ-rays C β-particles γ-rays α-particles D γ-rays α-particles β-particles

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2018

40 The count rate due to a sample of a radioactive isotope is measured for 80 minutes. time count rate / minutes counts / second 0 480 20 380 40 300 60 240 80 190 What is the half-life of the isotope? A 20 minutes B 40 minutes C 60 minutes D 80 minutes

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2018

39 A student measures the level of radiation emitted by a radioactive sample. radioactive sample counter detector The table shows the readings she records on the counter over a short period of time. counter reading 106 96 98 100 / counts per minute The sample is removed and the counter then shows a background radiation reading of 4 counts per minute. What is the best estimate for the average count rate due to the radioactive sample? A 96 counts per minute B 98 counts per minute C 100 counts per minute D 104 counts per minute

1 marks

Answer: A

This question in 0625/12 Feb/March 2019

40 Four students are discussing ideas about radioactive decay. Which student’s statement is correct? A B When a β-particle is When an α-particle is emitted, emitted, the nucleus the nucleus changes to that remains unchanged. of a different element. C D When a γ-ray is emitted, Stable nuclei are dangerous the nucleus changes to because they emit high that of a different element. levels of γ-radiation.

1 marks

Answer: B

This question in 0625/12 Feb/March 2019

39 A student measures the level of radiation emitted from a radioactive substance. He places a detector very close to the substance. He puts different absorbers between the radioactive substance and the detector. radioactive substance counter detector absorber The student’s results are shown. These results are corrected for background radiation. counter reading absorber counts per minute none 95 thin paper 52 few mm of aluminium 52 several cm of lead 12 Which types of radiation are being emitted by the substance? A α-particles and β-particles only B α-particles and γ-rays only C β-particles and γ-rays only D α-particles, β-particles and γ-rays

1 marks

Answer: B

This question in 0625/11 May/June 2019

40 The nuclei of the atoms in a substance are changing randomly and emitting radiation. What is happening to the substance? A It is undergoing electromagnetic induction. B It is undergoing magnetisation. C It is undergoing solidification. D It is undergoing radioactive decay.

1 marks

Answer: D

This question in 0625/11 May/June 2019

39 Which statement explains the meaning of the half-life of a radioactive isotope? A half the time taken for one nucleus of the isotope to decay B half the time taken for the isotope to decay completely C the time taken for half of the nuclei of the isotope to decay D the time taken for one nucleus of the isotope to split in half

1 marks

Answer: C

This question in 0625/12 May/June 2019

40 The diagram shows a lead-lined box used for storing radioactive sources. Why is the inside of the box lined with lead? A It helps the sources to stay radioactive for longer. B It makes the box heavier. C It makes the radioactive sources more stable. D It reduces the amount of radiation that can escape from the box.

1 marks

Answer: D

This question in 0625/12 May/June 2019

39 Which statement about γ-radiation is correct? A It consists of very small charged particles. B It is a form of electromagnetic radiation. C It is less penetrating than β-radiation. D It is more highly ionising than α-radiation.

1 marks

Answer: B

This question in 0625/13 May/June 2019

40 A radioactive element undergoes α-decay. Which statement is not correct? A A different element is formed. B Radiation is emitted from the nucleus. C The decay is a random process. D The number of particles in the nucleus stays the same.

1 marks

Answer: D

This question in 0625/13 May/June 2019

39 An isotope of radon is radioactive. It decays by emitting an α-particle. What happens to the nucleus of a radon atom during the emission of the α-particle? A It becomes the nucleus of a different isotope of radon with fewer neutrons. B It becomes the nucleus of a different isotope of radon with more neutrons. C It becomes the nucleus of an element with a higher proton number. D It becomes the nucleus of an element with a lower proton number.

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2019

40 Why are some radioactive sources stored in boxes made from lead? A Lead absorbs emissions from the radioactive sources. B Lead decreases the half-life of radioactive sources. C Lead increases the half-life of radioactive sources. D Lead repels emissions from the radioactive sources.

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2019

39 Which type of radiation can be stopped by a sheet of paper? A α-particles B β-particles C γ-rays D Χ-rays

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2019

40 Why are some radioactive sources stored in boxes made from lead? A Lead absorbs emissions from the radioactive sources. B Lead decreases the half-life of radioactive sources. C Lead increases the half-life of radioactive sources. D Lead repels emissions from the radioactive sources.

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2019

39 Three types of radiation that can cause ionisation are α-, β- and γ-radiation. Which row identifies the least and the most ionising of these radiations? least most ionising ionising A α β B α γ C γ β D γ α

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2019

40 Why are some radioactive sources stored in boxes made from lead? A Lead absorbs emissions from the radioactive sources. B Lead decreases the half-life of radioactive sources. C Lead increases the half-life of radioactive sources. D Lead repels emissions from the radioactive sources.

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2019

39 A thin sheet of paper is placed between a radioactive source and a radiation detector. The count rate falls to a very low reading. paper detector counter source From this result, which type of radiation is the source emitting? A α-particles B β-particles C γ-rays D X-rays

1 marks

Answer: A

This question in 0625/11 May/June 2020

40 In 1986 the Chernobyl nuclear power station in Ukraine suffered a meltdown. This caused background radiation in many countries, thousands of kilometres from Chernobyl, to increase. What was transported in the atmosphere to these countries to cause this rise in background radiation? A α-particles B β-particles C γ-rays D radioactive isotopes

1 marks

Answer: D

This question in 0625/11 May/June 2020

39 A thin sheet of paper is placed between a radioactive source and a radiation detector. The count rate falls to a very low reading. paper detector counter source From this result, which type of radiation is the source emitting? A α-particles B β-particles C γ-rays D X-rays

1 marks

Answer: A

This question in 0625/12 May/June 2020

40 A radioactive isotope has a half-life of 120 minutes. It emits radiation at a rate of 100 particles per second. How long does it take for the rate of emission to fall to 25 particles per second? A 30 minutes B 45 minutes C 90 minutes D 240 minutes

1 marks

Answer: D

This question in 0625/12 May/June 2020

39 A thin sheet of paper is placed between a radioactive source and a radiation detector. The count rate falls to a very low reading. paper detector counter source From this result, which type of radiation is the source emitting? A α-particles B β-particles C γ-rays D X-rays

1 marks

Answer: A

This question in 0625/13 May/June 2020

40 Why should all radioactive materials be handled carefully? A They all make anything they touch radioactive. B They all catch fire very easily. C They all emit ionising radiation. D They all have long half-lives.

1 marks

Answer: C

This question in 0625/13 May/June 2020

39 A radiation detector records a low reading even when no radioactive source is close. This is due to background radiation. What does not contribute to this background radiation? A rocks on Earth B cosmic rays from the Sun C satellite TV signals D waste from nuclear power stations

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2020

40 The graph shows the radioactive decay curve of a substance. 1000 count rate counts / s 750 500 250 0 0 5 10 15 20 25 30 time / years What is the half-life of this substance? A 0.5 years B 5 years C 15 years D 30 years

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2020

39 Three types of radiation are -radiation, -radiation and -radiation. Which statement is correct? A -radiation is less ionising than -radiation. B -radiation is less ionising than -radiation. C -radiation produces no ionisation. D -radiation is more ionising than -radiation.

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2020

40 The graph shows the radioactive decay curve of a substance. 1000 count rate counts / s 750 500 250 0 0 5 10 15 20 25 30 time / years What is the half-life of this substance? A 0.5 years B 5 years C 15 years D 30 years

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2020

39 A radiation detector in a laboratory is measuring background radiation. Which row describes the readings and the cause? readings cause A vary with no pattern background radiation is random B vary with no pattern radiation detectors are unstable C slowly increase during the day background radiation increases as temperature increases D slowly reduce during the day background radiation decreases as temperature increases

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2020

40 The graph shows the radioactive decay curve of a substance. 1000 count rate counts / s 750 500 250 0 0 5 10 15 20 25 30 time / years What is the half-life of this substance? A 0.5 years B 5 years C 15 years D 30 years

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2020

39 The diagram shows a radioactivity experiment. absorber counter source radiation detector When a piece of paper is used as the absorber, the count rate drops to the background count rate. Which radiation is the source emitting? A -radiation only B -radiation only C -radiation only D -radiation, -radiation and -radiation

1 marks

Answer: A

This question in 0625/12 Feb/March 2021

40 The graph shows how the count rate from a radioactive sample changes with time. 600 count rate counts / s 500 400 300 200 100 0 0 50 100 150 200 250 300 350 400 time / s What is the half-life for this sample? A 90 s B 120 s C 200 s D 400 s

1 marks

Answer: B

This question in 0625/12 Feb/March 2021

39 A radioactive atom decays by emission of a -particle. Which row is correct? what decays what happens to the atom A the nucleus of the atom it becomes a different element B the nucleus of the atom it becomes a lighter version of the same element C the outer layers of the atom it becomes a different element D the outer layers of the atom it becomes a lighter version of the same element

1 marks

Answer: A

This question in 0625/12 May/June 2021

40 The graph shows the activity of a radioactive source over a period of time. 120 activity counts / s 90 60 30 0 0 1 2 3 4 5 time / minutes What is the half-life of the source? A 1.0 minute B 2.0 minutes C 2.5 minutes D 4.0 minutes

1 marks

Answer: B

This question in 0625/12 May/June 2021

38 Some sources of background radiation are natural and others are due to human activity. Which source is natural? A medical X-rays B nuclear weapons testing C radioactive waste from power stations D radon gas from rocks

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2021

39 A radioactive material is placed near a detector. The detector shows a count rate of 28 000 counts / min. When a piece of card is put between the material and the counter, the reading decreases to 25 000 counts / min. When an aluminium sheet is put between the material and the counter, the reading remains at 25 000 counts / min. When a sheet of lead is put between the material and the counter, the reading decreases to 19 000 counts / min. What is being emitted by the radioactive material? A ,  and -radiation B  and -radiation only C  and -radiation only D  and -radiation only

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2021

40 A radioactive isotope has a half-life of 3 years. A sample gives a count rate of 100 counts / min on a detector. Which calculation is used to predict the count rate after 12 years? A 100  1 2  1 2  1 2  1 2 B 100  1 2  1 2  1 2 C 100  3 12 D 100  12 3  1 2

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2021

38 A sample contains 0.0016 g of a radioactive isotope. After 4.0 hours the mass of the radioactive isotope in the sample falls to 0.00080 g. What is the half-life of the radioactive isotope? A 2.0 hours B 4.0 hours C 8.0 hours D 16 hours

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2021

39 A sample of a radioactive isotope has a mass of 100 g. The half-life of the radioactive isotope is 6.0 hours. Which graph shows the decay for this isotope? A B mass of 100 mass of 100 isotope 80 isotope 80 remaining 60 remaining 60 / g 40 / g 40 20 20 0 0 0 1 2 3 4 5 6 7 8 9 101112 0 1 2 3 4 5 6 7 8 9 101112 time / hours time / hours C D mass of 100 mass of 100 isotope 80 isotope 80 remaining 60 remaining 60 / g 40 / g 40 20 20 0 0 0 1 2 3 4 5 6 7 8 9 101112 0 1 2 3 4 5 6 7 8 9 101112 time / hours time / hours

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2021

40 Which statement best describes background radiation? A any harmful level of radiation B radiation that is only found in space C radiation from natural sources D radiation that is absorbed by rocks

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2021

8 Electrical energy may be obtained from nuclear fission. In which order is the energy transferred in this process? A nuclear fuel  generator  reactor and boiler  turbines B nuclear fuel  generator  turbines  reactor and boiler C nuclear fuel  reactor and boiler  generator  turbines D nuclear fuel  reactor and boiler  turbines  generator

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2021

37 A very important experiment improved scientists’ understanding of the structure of matter. The experiment involved -particles being fired at a thin, gold foil. What happened? A All the -particles were absorbed by the nuclei of the gold atoms. B All the -particles were unaffected by the gold atoms. C Some of the -particles were attracted by the neutrons in the nuclei of the gold atoms. D Some of the -particles were repelled by the protons in the nuclei of the gold atoms.

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2021

39 The half-life for lead-202 is 52 500 years. A sample of lead-202 produces 800 counts / s. How long will it take for the count rate to drop to 100 counts / s? A 105 000 years B 157 500 years C 210 000 years D 420 000 years

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2021

40 Why is a thick shield made of lead needed to protect people from a source of -rays? A Gamma radiation is strongly ionising and so is not very penetrating. B Gamma radiation is strongly ionising and so is very penetrating. C Gamma radiation is weakly ionising and so is not very penetrating. D Gamma radiation is weakly ionising and so is very penetrating.

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2021

39 The table compares the penetrating abilities and ionising effects of -particles and of -radiation. Which row is correct? least most penetrating ionising A   B   C   D  

1 marks

Answer: A

This question in 0625/12 Feb/March 2022

40 When a radioactive isotope is set up close to a counter, a count rate of 38 000 counts / s is obtained. The table shows the count rate from the isotope over a three-year period. count rate time / years counts / s 0 38 000 1 26 000 2 17 000 3 12 000 What is the half-life of the isotope? A less than 1 year B more than 1 year but less than 2 years C more than 2 years but less than 3 years D more than 3 years

1 marks

Answer: B

This question in 0625/12 Feb/March 2022

39 A radioactive source has a half-life of 0.5 hours. A detector near the source shows a reading of 6000 counts per second. Background radiation can be ignored. What is the reading on the detector 1.5 hours later? A 750 counts per second B 1500 counts per second C 2000 counts per second D 3000 counts per second

1 marks

Answer: A

This question in 0625/11 May/June 2022

40 Which statement about the radioactive decay of a substance is correct? A It cannot be predicted when a particular nucleus will decay. B Placing a radioactive substance inside a lead-lined box prevents it from decaying. C The decay always produces poisonous gases. D The rate of decay increases if the substance is dissolved in water.

1 marks

Answer: A

This question in 0625/11 May/June 2022

39 A radioactive source has a half-life of 0.5 hours. A detector near the source shows a reading of 6000 counts per second. Background radiation can be ignored. What is the reading on the detector 1.5 hours later? A 750 counts per second B 1500 counts per second C 2000 counts per second D 3000 counts per second

1 marks

Answer: A

This question in 0625/12 May/June 2022

40 Some nuclei are unstable. They emit radiation and change into nuclei of a different element. What is this process called? A convection B electromagnetic induction C radioactive decay D the motor effect

1 marks

Answer: C

This question in 0625/12 May/June 2022

39 A radioactive source has a half-life of 0.5 hours. A detector near the source shows a reading of 6000 counts per second. Background radiation can be ignored. What is the reading on the detector 1.5 hours later? A 750 counts per second B 1500 counts per second C 2000 counts per second D 3000 counts per second

1 marks

Answer: A

This question in 0625/13 May/June 2022

40 Which statement explains why radioactive materials need to be handled carefully? A -rays are part of the electromagnetic spectrum. B Radioactive decay is a random process. C Radioactive materials have a half-life. D The radiation given out is ionising.

1 marks

Answer: D

This question in 0625/13 May/June 2022

38 Everyone is exposed to background radiation. What are sources of background radiation? A food and drink only B rocks only C cosmic rays only D food and drink, rocks and cosmic rays

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2022

39 The diagram shows a piece of apparatus used to determine the nature of the emissions from a radioactive source. The absorbers can be raised out of or lowered into the path of the radiation from the source to the detector. The apparatus is evacuated. different absorbers detector radioactive source vacuum The table gives a set of results for a particular radioactive source. count rate on detector absorber in use (counts per second) none 350 thin paper 350 1.0 mm aluminium 180 1.0 cm lead 23 Which types of radiation are being emitted by the radioactive source? A α-particles and β-particles B α-particles only C β-particles and γ-rays D β-particles only

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2022

40 The half-life of a sample of radioactive material is 400 years. How long will it take until only 4 1 of this sample remains undecayed? A 100 years B 400 years C 800 years D 1600 years

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2022

38 In the processes shown, X and Y are elements. Which process describes -decay? A Atoms of X collide with atoms of Y. B Atoms of X emit atoms of Y. C Atoms of X change into ions of Y. D Atoms of X absorb -particles.

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2022

39 A high-voltage power supply is connected to a metal grid and a wire, as shown. radioactive source emitting a-particles metal grid high voltage observed When the radioactive source is placed close to the grid, sparks are observed in the position indicated. Which statement explains why the sparks are formed? A a-particles have a long range. B~ a-particles have no charge. C_ a-particles have no mass. D a-particles are strongly ionising.

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2022

40 A radioactive substance has a half-life of 6 hours. It has an initial rate of emission of 120 counts per second. How long will it take for this rate of emission to fall to 30 counts per second? A 1.5 hours B 12 hours C 30 hours D 240 hours

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2022

36 What is an artificial source of background radiation? A X-ray machines in hospitals B radon gas from rocks C cosmic rays from the Sun D plants and other living things

1 marks

Answer: A

This question in 0625/12 Feb/March 2023

37 A sample of a radioactive isotope has an initial rate of emission of 128 counts per minute and a half-life of 4 days. How long will it take for the rate of emission to fall to 32 counts per minute? A 2 days B 4 days C 8 days D 12 days

1 marks

Answer: C

This question in 0625/12 Feb/March 2023

36 Which statement about the random decay of the nuclei in a sample of uranium-238 is correct? A The probabilities of an alpha-particle, a beta-particle or a gamma ray being emitted from a nucleus in the sample are equal. B The probability of a nucleus in the sample decaying decreases as time passes. C The probability of a nucleus decaying in any ten minute interval is the same for all the nuclei in the sample. D The probability of a nucleus in the sample decaying increases as time passes.

1 marks

Answer: C

This question in 0625/11 May/June 2023

37 The count rate due to a sample of a radioactive isotope is measured for 80 minutes. time count rate / minutes counts / second 0 480 20 380 40 300 60 240 80 190 What is the half-life of the isotope? A 20 minutes B 40 minutes C 60 minutes D 80 minutes

1 marks

Answer: C

This question in 0625/11 May/June 2023

36 A sample of a radioactive isotope emits 9600 -particles per second. After 40 hours the rate of emission has fallen to 600 -particles per second. What is the half-life of this isotope? A 4.0 hours B 8.0 hours C 10 hours D 20 hours

1 marks

Answer: C

This question in 0625/12 May/June 2023

37 Which row states a harmful effect and a beneficial effect of ionising radiation on living things? harmful effect beneficial effect A kills cancer cells kills cancer cells B kills cancer cells mutates living cells C mutates living cells kills cancer cells D mutates living cells mutates living cells

1 marks

Answer: C

This question in 0625/12 May/June 2023

36 What is a major source of background radiation? A cosmic rays B microwaves from mobile (cell) phones C nuclear power stations D visible light from the Sun

1 marks

Answer: A

This question in 0625/13 May/June 2023

37 The graph shows the radioactive decay curve of a substance. 1000 count rate counts / s 750 500 250 0 0 5 10 15 20 25 30 time / years What is the half-life of this substance? A 0.5 years B 5 years C 15 years D 30 years

1 marks

Answer: B

This question in 0625/13 May/June 2023

35 -particles, -particles and -rays are emitted by radioactive nuclei when they decay. Which emissions can be deflected by an electric field? A -particles, -particles and -rays B -particles and -particles only C -particles and -rays only D -rays and -particles only

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2023

36 The graph shows the count rate from a radioactive source over a period of time. 2000 count rate counts / s 1500 1000 500 0 0 1 2 3 time / hours What is the half-life of the source? A 0.5 hour B 1.0 hour C 1.5 hours D 3.0 hours

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2023

37 A scientist carries out an experiment using a sealed source which emits -particles. The range of the -particles in the air is about 30 cm. Which precaution is the most effective to protect the scientist from the radiation? A handling the source with long tongs B keeping the temperature of the source low C opening all windows in the laboratory D washing his hands before leaving the laboratory

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2023

35 Which row correctly describes an example of radioactive decay? original change or emission nucleus no change of element A stable  change of element B unstable  change of element C unstable  no change of element D unstable  no change of element

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2023

36 A detector is used to monitor the emissions from a radioactive source over several days. The table shows the count rate from the source at different times. count rate time / days counts / s 0 250 1 215 2 180 3 148 4 120 5 100 What is the half-life of the source? A between 1 and 2 days B between 2 and 3 days C between 3 and 4 days D between 4 and 5 days

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2023

37 What is the most effective precaution to reduce the risk when handling, storing or using a radioactive source that emits -rays? A Handle the source for the least possible time. B Have a fire extinguisher nearby when using the source. C Store the source at a low temperature. D Wear plastic safety goggles when handling the source.

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2023

35 The half-life of carbon-14 is 5700 years. An object containing carbon-14 has a count rate of 100 counts / minute when it is first formed. The graph shows how the count rate decreases over time. Which point on the graph corresponds to a time 11 400 years after the formation of the object? 100 count rate A counts / minute B C D 0 0 time

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2023

36 Which type of radioactive decay causes the nucleus of one element to change into the nucleus of another element? emission of an emission of a emission of a alpha-particle beta-particle gamma ray

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2023

37 A scientist needs to use a source of γ-rays as safely as possible. Which action will not reduce the total radiation that reaches the scientist? A keeping the distance between the source and the scientist as large as possible B keeping the temperature of the source as low as possible C keeping the time for which the scientist uses the source as small as possible D placing a lead screen between the scientist and the source

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2023

32 Which apparatus is used to measure background radiation? A a counter, a detector and a source B a counter and a detector only C a counter and a source only D a detector and a source only

1 marks

Answer: B

This question in 0625/12 Feb/March 2024

33 Which row correctly identifies the nature of each radioactive emission? alpha () beta () gamma () A helium nucleus electromagnetic wave electron B electron helium nucleus electromagnetic wave C helium nucleus electron electromagnetic wave D electromagnetic wave electron helium nucleus

1 marks

Answer: C

This question in 0625/12 Feb/March 2024

34 A nucleus spontaneously emits radiation and becomes a nucleus of a different element. What could the emitted radiation be? A alpha or beta B alpha or gamma C beta or neutron D gamma or neutron

1 marks

Answer: A

This question in 0625/12 Feb/March 2024

35 The diagram shows a lead-lined box used for storing a radioactive source. Why is the inside of the box lined with lead? A It helps the source to stay radioactive for longer. B It makes the box heavier. C It makes the radioactive source more stable. D It reduces the amount of radiation that can escape from the box.

1 marks

Answer: D

This question in 0625/12 Feb/March 2024

34 An isotope of radon is radioactive. It decays by emitting an -particle. What happens to the nucleus of a radon atom during the emission of the -particle? A It becomes the nucleus of a different isotope of radon with fewer neutrons. B It becomes the nucleus of a different isotope of radon with more neutrons. C It becomes the nucleus of an element with a higher proton number. D It becomes the nucleus of an element with a lower proton number.

1 marks

Answer: D

This question in 0625/11 May/June 2024

35 The nuclide notation of the isotope strontium-90 is 90 Sr. 38 Which statement is correct? A A nucleus of strontium-90 has 38 neutrons. B A nucleus of strontium-90 has 52 neutrons. C A nucleus of strontium-90 has 90 electrons. D A nucleus of strontium-90 has 90 neutrons.

1 marks

Answer: B

This question in 0625/11 May/June 2024

36 A box is used for storing radioactive sources. What is the best material to use for lining the box to prevent radiation from escaping? A aluminium B lead C paper D plastic

1 marks

Answer: B

This question in 0625/11 May/June 2024

34 A radiation detector in a laboratory is measuring background radiation. Which row describes the readings and the cause? readings cause A vary with no pattern background radiation is random B vary with no pattern radiation detectors are unstable C slowly increase during the day background radiation increases as temperature increases D slowly reduce during the day background radiation decreases as temperature increases

1 marks

Answer: A

This question in 0625/13 May/June 2024

35 The nuclei of the atoms in a substance are changing randomly and emitting radiation. What is happening to the substance? A It is undergoing electromagnetic induction. B It is undergoing magnetisation. C It is undergoing solidification. D It is undergoing radioactive decay.

1 marks

Answer: D

This question in 0625/13 May/June 2024

36 What is the safest way to store a radioactive source? A in a lead-lined box in a metal cabinet B on a shelf away from other radioactive materials C in a glass bottle containing oil D in a fume cupboard

1 marks

Answer: A

This question in 0625/13 May/June 2024

35 The diagram shows five atoms in a radioactive substance. The atoms each give out an -particle. first particle atom 1 atom atom 2 5 atom atom 4 3 second particle Atom 1 is the first to give out a particle. Atom 3 is the second to give out a particle. Which atom will give out the next particle? A atom 2 B atom 4 C atom 5 D impossible to tell

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2024

36 The diagram shows a radioactive source, a thick aluminium sheet and a radiation detector. radioactive thick aluminium radiation detector source sheet The radiation detector shows a reading greater than the background reading. Which type of radiation is being emitted by the source and detected by the detector? A -radiation B -radiation C -radiation D infrared radiation

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2024

37 The half-life of the radioactive isotope caesium 137 Cs is 30 years. 55 Starting with 30 g of the isotope, which mass of the isotope remains after 90 years? A 10.0 g B 7.50 g C 3.75 g D 1.25 g

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2024

34 A student suggests three sources of naturally occurring background radiation. 1 cosmic rays 2 medical X-rays 3 radioactive emissions from radon gas from the ground Which suggestions are correct? A 1 and 3 B 1 only C 2 and 3 D 2 only

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2024

35 A student measures the rate at which ionising radiation is emitted from a radioactive substance. He places a detector at different distances from the radioactive source. radioactive source count rate meter detector distance d The table shows how the count rate from the source varies with distance d. distance d / cm 0 2 4 6 count rate / counts per minute 1250 115 0 0 Which type of ionising radiation is being emitted by the substance? A -particles B -particles C -rays D X-rays

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2024

36 Radioactive decay results in the emission of -particles, -particles and -radiation. Which types of emission result in a nucleus changing to that of a different element? A -particle emission and -particle emission B -particle emission and -radiation emission C -particle emission and -radiation emission D -radiation emission only

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2024

37 A radioactive isotope has a half-life of 120 minutes. It emits radiation at a rate of 100 particles per second. How long does it take for the rate of emission to fall to 25 particles per second? A 30 minutes B 45 minutes C 90 minutes D 240 minutes

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2024

34 When measuring the emissions from a radioactive rock brought into the laboratory, a teacher mentions that background radiation must be taken into account. What is this background radiation? A ionising radiation in the laboratory when the radioactive rock is not present B ionising radiation from the radioactive rock brought into the laboratory C infrared radiation from the Sun D infrared radiation from warm objects in the laboratory

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2024

35 How do the ionising effect and the penetrating ability of -particles compare with those of -particles and -rays? ionising penetrating effect ability A higher lower B higher higher C lower lower D lower higher

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2024

36 Half-life is … 1 … for the … 2 … a sample of a radioactive isotope to halve. Which words correctly complete gaps 1 and 2? 1 2 A half of the time taken nucleon number of B half of the time taken number of nuclei in C the time taken nucleon number of D the time taken number of nuclei in

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2024

37 Radioactive materials must be handled in a safe way. What is not a safety procedure? A storing radioactive materials in cardboard boxes B monitoring exposure time to radioactive materials C using tongs to pick up the radioactive source D wearing protective clothing

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2024

37 In a laboratory, a radiation detector is connected to a counter which shows a reading for the count rate due to background radiation. detector Which unit is count rate measured in? A counts / s B minutes / count C coulombs / minute D amperes / s

1 marks

Answer: A

This question in 0625/12 Feb/March 2025

38 Which statement about alpha, beta and gamma emissions is correct? A Alpha-particles are lighter than beta-particles. B Beta-particles are not deflected by magnetic fields. C Gamma rays are more penetrating than alpha-particles and beta-particles. D Gamma rays are more ionising than alpha-particles and beta-particles.

1 marks

Answer: C

This question in 0625/12 Feb/March 2025

39 What is an effect of ionising nuclear radiation on living things? A cell mutation B electric shock C internal cooling of body cells D broken bones

1 marks

Answer: A

This question in 0625/12 Feb/March 2025

34 The table shows the contribution to background radiation from the four most common sources. percentage of total source background radiation / % radon gas (in the air) 48 rocks and buildings 13 food and drink 10 cosmic rays 11 Which percentage of background radiation comes from all other sources? A 14% B 18% C 21% D 82%

1 marks

Answer: B

This question in 0625/11 May/June 2025

35 The unstable nucleus of an element undergoes radioactive decay. The proton number remains unchanged. Which description of this radioactive decay event is correct? A The nucleus emits an -particle. B The nucleus emits a -particle. C The nucleus emits -radiation. D The nucleus emits an -particle, a -particle and -radiation together.

1 marks

Answer: C

This question in 0625/11 May/June 2025

22 A person exposed to excessive radiation from certain parts of the electromagnetic spectrum is likely to suffer cell damage. Which radiations cause cell damage? A gamma rays and ultraviolet B gamma rays only C green light and red light D radio waves and green light

1 marks

Answer: A

This question in 0625/12 May/June 2025

35 Which list only includes sources of naturally occurring background radiation? A cosmic rays, radon gas, nuclear power stations B food and drink, mobile phones, cosmic rays C rocks and buildings, food and drink, radon gas D rocks and buildings, mobile phones, nuclear power stations

1 marks

Answer: C

This question in 0625/12 May/June 2025

36 A student compares alpha emissions, beta emissions and gamma emissions. Which statement is correct? A Alpha emissions are the most ionising. B Beta emissions are the most penetrating. C Beta emissions are part of the electromagnetic spectrum. D Gamma emissions are streams of charged particles.

1 marks

Answer: A

This question in 0625/12 May/June 2025

37 In school laboratories, radioactive sources are stored in lead-lined boxes. Why is lead used? A Lead neutralises radiation. B Lead absorbs radiation. C Lead repels radiation. D Lead dissolves radiation.

1 marks

Answer: B

This question in 0625/12 May/June 2025

22 A person exposed to excessive radiation from certain parts of the electromagnetic spectrum is likely to suffer cell damage. Which radiations cause cell damage? A gamma rays and ultraviolet B gamma rays only C green light and red light D radio waves and green light

1 marks

Answer: A

This question in 0625/13 May/June 2025

35 Which list only includes sources of naturally occurring background radiation? A cosmic rays, radon gas, nuclear power stations B food and drink, mobile phones, cosmic rays C rocks and buildings, food and drink, radon gas D rocks and buildings, mobile phones, nuclear power stations

1 marks

Answer: C

This question in 0625/13 May/June 2025

36 A student compares alpha emissions, beta emissions and gamma emissions. Which statement is correct? A Alpha emissions are the most ionising. B Beta emissions are the most penetrating. C Beta emissions are part of the electromagnetic spectrum. D Gamma emissions are streams of charged particles.

1 marks

Answer: A

This question in 0625/13 May/June 2025

37 In school laboratories, radioactive sources are stored in lead-lined boxes. Why is lead used? A Lead neutralises radiation. B Lead absorbs radiation. C Lead repels radiation. D Lead dissolves radiation.

1 marks

Answer: B

This question in 0625/13 May/June 2025

35 When the count rate from a radioactive source is measured, background radiation is taken into account. Which option shows only examples of nuclear background radiation? A alpha-particles from radon gas and gamma radiation from space B alpha-particles from radon gas and infrared radiation from the Sun C gamma radiation from the Sun and microwaves from satellites D microwaves from satellites and X-rays from hospitals

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2025

36 Strontium-89 is a radioactive beta-emitter used to treat bone cancers. A solution of strontium chloride is injected into patients and accumulates in their bones. Which statement about this treatment is not correct? A Beta radiation is a form of electromagnetic radiation. B Beta-particles are a form of ionising radiation. C The strontium-89 atoms change to atoms of another element when they decay. D Beta-particles are negatively charged.

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2025

37 An isotope of strontium decays by  emission. It takes 87 hours for its activity to fall to 8 1 of its original value. What is the half-life of the isotope? A 11 hours B 29 hours C 44 hours D 260 hours

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2025

36 Alpha, beta and gamma emissions are compared. Alpha radiation is the … 1 … ionising as it has the … 2 … electric charge. Which words correctly complete the sentence? 1 2 A least largest B least smallest C most largest D most smallest

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2025

37 A student collects data for a new radioactive substance. 800 000 700 000 count rate 600 000 counts / s 500 000 400 000 300 000 200 000 100 000 0 0 500 1000 1500 2000 2500 3000 3500 4000 time / s Using the graph, what is the approximate half-life of the substance? A 1400 s B 2000 s C 100 000 s D 800 000 s

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2025