Cambridge IGCSE Science - Combined 0653 — 2018 May/June Paper 2 · Variant 1

Question 1

1 Most cars burn fossil fuels to release energy for their movement. Which characteristic of living organisms is similar to this? A excretion B growth C nutrition D respiration

Accepted Answer

D

Question 2

2 Which structure controls the passage of substances into and out of a cell? A cell membrane B cell wall C nucleus D vacuole

Accepted Answer

A

Question 3

3 Amylase is an enzyme that digests starch. Identical mixtures of starch and amylase are kept at different temperatures. The percentage of starch digested in 20 minutes is recorded. The results are shown in the graph. 100 percentage of starch digested 50 in 20 minutes 0 0 10 20 30 40 50 60 70 temperature / °C The mixtures that were kept at 0 °C and 70 °C are then kept at a temperature of 40 °C for one hour. What are the results after this hour? percentage of starch digested sample originally sample originally kept at 0 °C kept at 70 °C A 0 0 B 0 100 C 100 0 D 100 100

Accepted Answer

C

Question 4

4 Which two chemical substances are required for photosynthesis? A carbon dioxide and glucose B glucose and oxygen C oxygen and water D water and carbon dioxide

Accepted Answer

D

Question 5

5 The diagram shows a plant in a controlled environment.

controlled
environment

The list gives three ways in which the environment can be altered.

1 humidity increased
2 __ light intensity increased

3 temperature increased

Which changes will cause an increase in the rate of transpiration of the plant?

1 2 3
A v v x
B v x x
Cc x x v
D x v v

Accepted Answer

D

Question 6

6 The diagram shows a section through the human heart. valve 4 valve 3 valve 2 valve 1 What happens to the valves as blood is being pumped to the lungs? valve 1 valve 2 valve 3 valve 4 A closed closed open closed B closed closed open open C open open closed closed D open open closed open

Accepted Answer

B

Question 7

7 What is the maximum number of carbon dioxide molecules produced when four glucose molecules are used in aerobic respiration? A 6 B 12 C 24 D 48

Accepted Answer

C

Question 8

8 Why is tar in cigarette smoke a harmful chemical? A It causes addiction. B It causes cancer. C It makes platelets stick together. D It sticks to blood vessel walls.

Accepted Answer

B

Question 9

9 The diagram shows a seedling with its shoot horizontal. shoot P Q Gravity is the stimulus acting on the seedling. Where will the greatest concentrations of auxin be found in the shoot and what effect will this have on the rate of cell elongation? greatest concentration effect of auxin on rate of auxin of cell elongation A P increases B P decreases C Q increases D Q decreases

Accepted Answer

C

Question 10

10 Why are many flowers brightly coloured? A to attract insects to pollinate the flower B to encourage birds to eat insects on the flower C to frighten animals away from the flower D to help with wind-pollination of the flower

Accepted Answer

A

Question 11

11 The diagrams show the human male and female reproductive systems. 3 2 4 1 Which numbered parts produce gametes? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Accepted Answer

B

Question 12

12 At which trophic level in a food chain does transpiration occur? A trophic level 1 B trophic level 2 C trophic level 3 D trophic level 4

Accepted Answer

A

Question 13

13 Which statement about greenhouse gases is correct? A They are caused by acid rain. B They are produced by photosynthesis. C They generate heat when they react with sunlight. D They reduce the loss of heat from the Earth.

Accepted Answer

D

Question 14

14 The diagrams represent different substances. P Q R S T Which row describes the substances? only separate mixture of atoms only molecules atoms and molecules A P Q S B Q T R C T P R D T Q P

Accepted Answer

A

Question 15

15 Which row describes the method used to obtain salt from salt water and petrol from petroleum? salt from salt water petrol from petroleum A crystallisation distillation B crystallisation fractional distillation C filtration distillation D filtration fractional distillation

Accepted Answer

B

Question 16

16 Some changes are listed. 1 boiling 2 decomposing 3 evaporating 4 oxidising Which changes are physical changes? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Accepted Answer

B

Question 17

17 The formula of a sodium ion is Na+. The formula of an oxide ion is O2–. What is the formula of sodium oxide? A NaO B NaO2 C Na2O D Na2O3

Accepted Answer

C

Question 18

18 The diagram shows apparatus for electrolysis. Only one label is correct. electrode + – cathode anode electrolyte Which label on the diagram is correct? A anode B cathode C electrode D electrolyte

Accepted Answer

D

Question 19

19 Molten sodium chloride is electrolysed. Which row shows the product and the equation for the reaction at the stated electrode? equation for reaction electrode product at the electrode A negative chlorine 2Cl –  →  Cl 2  +  2e– B negative sodium Na+  +  e–  →  Na C positive chlorine 2Cl 2–  →  Cl 2  +  4e– D positive sodium Na+  +  2e–  →  Na

Accepted Answer

B

Question 20

20 Which change must take place in an endothermic reaction? A Bubbles of gas are released. B The mass decreases. C The temperature decreases. D The temperature increases.

Accepted Answer

C

Question 21

21 The volume of carbon dioxide produced in a reaction is measured. The results are plotted on a graph. At which time is the rate of reaction greatest? volume of carbon dioxide A B C D time

Accepted Answer

B

Question 22

22 Four reaction equations involving oxides of iron are listed. 1 Fe2O3  +  2Al  →  Al 2O3  +  2Fe 2 4FeO  +  O2  →  2Fe2O3 3 FeO  +  H2  →  Fe  +  H2O 4 2FeO  +  C  →  2Fe  +  CO2 Which statement is correct? A In reaction 1, Al is being oxidised by Fe2O3. B In reaction 2, FeO is being reduced by O2. C In reaction 3, H2 is being reduced by FeO. D In reaction 4, FeO is being oxidised by carbon.

Accepted Answer

A

Question 23

23 Excess solid copper oxide is added to warm dilute sulfuric acid and stirred. How are pure copper sulfate crystals obtained from the mixture? A distil the mixture → wash the solid → dry the solid B filter the mixture → distil the filtrate C filter the mixture → heat the filtrate to saturation → cool and filter → dry the solid D heat the mixture to saturation → cool and filter → dry the solid

Accepted Answer

C

Question 24

24 Which statement describes the metallic character of elements in Period 2 of the Periodic Table? A The first and last elements in this period are metals. B The metallic elements are in the centre of this period. C The metallic elements are on the left of this period. D The metallic elements are on the right of this period.

Accepted Answer

C

Question 25

25 The arrangement of particles in four substances is shown. Which diagram represents an alloy? A B C D + – + – – + – + + – + –

Accepted Answer

A

Question 26

26 Which process produces a gas that contributes to climate change? A the electrolysis of molten lead(II) bromide B the reaction of calcium with water C the reaction of copper oxide with dilute sulfuric acid D the thermal decomposition of calcium carbonate

Accepted Answer

D

Question 27

27 Butane, C4H10, and decane, C10H22, are alkanes. Molecules of decane are larger than molecules of butane. Which row describes the properties of decane compared to those of butane? intermolecular boiling point attractive forces A higher stronger B higher weaker C lower stronger D lower weaker

Accepted Answer

A

Question 28

28 Diagrams 1, 2 and 3 show two distance-time graphs and one speed-time graph. distance distance speed 0 0 0 0 time 0 time 0 time diagram 1 diagram 2 diagram 3 Which of the diagrams represent the motion of an object that is accelerating? A 1 and 2 B 1 only C 2 only D 3 only

Accepted Answer

B

Question 29

29 A student takes an object from one place on Earth to another place where the gravitational field is weaker. Which property of the object has a smaller value at the second location? A density B mass C volume D weight

Accepted Answer

D

Question 30

30 An unstretched spring obeys Hooke’s law and has a length of 10 cm. A load with a mass of 2.0 kg is hung from it, and its length becomes 14 cm. The load is now increased to 6.0 kg, and the new length of the spring is Y. The limit of proportionality is not reached. 10 cm 14 cm Y 2.0 kg 6.0 kg What is Y? A 22 cm B 26 cm C 30 cm D 42 cm

Accepted Answer

A

Question 31

31 Electricity can be obtained from the energy in water behind a hydroelectric dam. Is this energy resource renewable, and in which form is its energy stored? renewable form of energy A no chemical B no gravitational potential C yes chemical D yes gravitational potential

Accepted Answer

D

Question 32

32 A machine does 6.0 kJ of useful work in 20 minutes. How much useful power does it produce? A 0.30 W B 5.0 W C 120 W D 300 W

Accepted Answer

B

Question 33

33 On a summer’s day, hot air rises above hot roofs. What is the name of this process? A concentration B condensation C conduction D convection

Accepted Answer

D

Question 34

34 A radio station transmits signals at a frequency of 9.1 × 107 Hz. What is the wavelength of the radio waves? Light travels at a speed of 3.0 × 108 m / s. A 0.30 m B 0.33 m C 3.0 m D 3.3 m

Accepted Answer

D

Question 35

35 The diagram shows a ray of light as it enters a glass block. Which labelled angle is the angle of refraction? ray of light A B D C glass block

Accepted Answer

C

Question 36

36 Optical fibres are used to transmit telephone conversations. What is transmitted by the optical fibres? A electromagnetic waves with constant amplitude B pulses of electromagnetic waves C pulses of sound waves D sound waves with constant amplitude

Accepted Answer

B

Question 37

37 A student writes two sentences about sound waves. ‘A sound wave travels through the air as compressions and ......X...... .’ ‘The air at the compressions has a different ......Y...... from the air at ......X...... .’ What are the missing words, X and Y? X Y A rarefactions density B rarefactions state C refractions density D refractions state

Accepted Answer

A

Question 38

38 A negative ion X is close to a positive ion and another negative ion. Electrical forces act on ion X because of the charges in the other two ions. Which diagram shows the directions of the two forces acting on ion X? A B C D positive ion + + + + – ion X – ion X – ion X – ion X – – – – negative ion

Accepted Answer

B

Question 39

39 A 240 V mains supply causes a current of 4.00 A in a heater. How much energy is transferred in the heater in 5.00 minutes? A 192 J B 4800 J C 18 000 J D 288 000 J

Accepted Answer

D

Question 40

40 An electric kettle has the following label attached to its base. current: 7.5 A frequency: 50 Hz power: 1800 W voltage: 240 V How is an appropriate fuse for the kettle labelled? A 10 A B 60 Hz C 2000 W D 300 V

Accepted Answer

A

Question paper16 pages

Mark scheme4 pages

Questions as text

Q1 · Most cars burn fossil fuels to release energy for their movement

Q2 · Which structure controls the passage of substances into and out of a cell?

Q3 · Amylase is an enzyme that digests starch

Q4 · Which two chemical substances are required for photosynthesis?

Q5 · The diagram shows a plant in a controlled environment

Q6 · The diagram shows a section through the human heart

Q7 · What is the maximum number of carbon dioxide molecules produced when four glucose…

Q8 · Why is tar in cigarette smoke a harmful chemical?

Q9 · The diagram shows a seedling with its shoot horizontal

Q10 · Why are many flowers brightly coloured?

Q11 · The diagrams show the human male and female reproductive systems

Q12 · At which trophic level in a food chain does transpiration occur?

Q13 · Which statement about greenhouse gases is correct?

Q14 · The diagrams represent different substances

Q15 · Which row describes the method used to obtain salt from salt water and petrol from…

Q16 · Some changes are listed

Q17 · The formula of a sodium ion is Na+

Q18 · The diagram shows apparatus for electrolysis

Q19 · Molten sodium chloride is electrolysed

Q20 · Which change must take place in an endothermic reaction?

Q21 · The volume of carbon dioxide produced in a reaction is measured

Q22 · Four reaction equations involving oxides of iron are listed

Q23 · Excess solid copper oxide is added to warm dilute sulfuric acid and stirred

Q24 · Which statement describes the metallic character of elements in Period 2 of the Periodic…

Q25 · The arrangement of particles in four substances is shown

Q26 · Which process produces a gas that contributes to climate change?

Q27 · Butane, C4H10, and decane, C10H22, are alkanes

Q28 · Diagrams 1, 2 and 3 show two distance-time graphs and one speed-time graph

Q29 · A student takes an object from one place on Earth to another place where the…

Q30 · An unstretched spring obeys Hooke’s law and has a length of 10 cm

Q31 · Electricity can be obtained from the energy in water behind a hydroelectric dam

Q32 · A machine does 6.0 kJ of useful work in 20 minutes

Q33 · On a summer’s day, hot air rises above hot roofs

Q34 · A radio station transmits signals at a frequency of 9.1 × 107 Hz

Q35 · The diagram shows a ray of light as it enters a glass block

Q36 · Optical fibres are used to transmit telephone conversations

Q37 · A student writes two sentences about sound waves

Q38 · A negative ion X is close to a positive ion and another negative ion

Q39 · A 240 V mains supply causes a current of 4.00 A in a heater

Q40 · An electric kettle has the following label attached to its base

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