Cambridge IGCSE Science - Combined 0653 — 2008 Oct/Nov Paper 1 · Variant 1

Question 1

1 The diagram shows a mesophyll cell from a green plant. Where is the cell’s DNA found? A B C D

Accepted Answer

B

Question 2

2 The diagram shows a leaf in sunlight and some of the substances that diffuse into and out of it. water vapour carbon oxygen dioxide Which of the following has a higher concentration outside the leaf than inside the leaf? A carbon dioxide only B carbon dioxide and oxygen C oxygen and water D water vapour only

Accepted Answer

A

Question 3

3 The diagrams show an experiment on enzyme activity. The test-tubes contain equal volumes of solutions of catalase and hydrogen peroxide. In which test-tube does the enzyme fail to work because it has been denatured? A B C D at 4 °C at 37 °C at 37 °C at 37 °C mixture of mixture of mixture of catalase boiled catalase and catalase and boiled hydrogen and hydrogen peroxide hydrogen peroxide peroxide

Accepted Answer

C

Question 4

4 In which way do plants usually take in water from their surroundings? A as liquid through stomata B as liquid through root hairs C as vapour through stomata D as vapour through root hairs

Accepted Answer

B

Question 5

5 A series of tests on a white liquid gave the following results. test result of test Benedict’s an orange-red colour biuret a pale blue colour iodine a blue-black colour What did the white liquid contain? A protein and starch only B protein and reducing sugar only C protein, reducing sugar and starch D reducing sugar and starch only

Accepted Answer

D

Question 6

6 The diagram shows the thorax. Which part has a lining containing goblet cells? A B C D

Accepted Answer

A

Question 7

7 The diagram shows a section through the human heart. tendons Which structures are joined by the tendons? A atrium wall and septum B atrium wall and valve C septum and ventricle wall D valve and ventricle wall

Accepted Answer

D

Question 8

8 A plant shoot is left for several hours in a solution of red dye. red dye What is seen when a section is cut through a leaf and observed under a microscope? A B key red area C D

Accepted Answer

B

Question 9

9 Which sequence shows the path of a signal through the nervous system when a person touches a hot object? A central nervous system → effector → receptor B effector → central nervous system → receptor C effector → receptor → central nervous system D receptor → central nervous system → effector

Accepted Answer

D

Question 10

10 Which event that happens in the ovary of a flower starts seed formation? A conservation B fertilisation C germination D pollination

Accepted Answer

B

Question 11

11 Which is not responsible for variation in characteristics in a plant? A chromosomes B cloning C environment D genes

Accepted Answer

B

Question 12

12 The diagram shows part of the carbon cycle. carbon dioxide in the air 1 6 3 carbon compounds carbon compounds in fossil fuels in animals 4 carbon compounds 2 in plants carbon compounds 5 in dead animals and plants During which stage in the cycle will oxygen be added to the air? A 1 B 3 C 5 D 6

Accepted Answer

D

Question 13

13 Which are possible harmful effects of deforestation?

reduced species

global warming diversity soil erosion
A v v v
B v v x
Cc v x x
D x v v

key
Jv =yes
X =no

Accepted Answer

A

Question 14

14 The symbol for an atom of neon is 20 10Ne . Which statement about the atom is correct? A It contains half as many neutrons as protons. B It contains twice as many neutrons as protons. C The number of neutrons equals the number of protons. D The total number of neutrons and protons is thirty.

Accepted Answer

C

Question 15

15 On heating iron and sulphur together, the mixture starts to glow. The glow then continues even when the heating is stopped. In this reaction, ……1…… heat is given out and a new ……2…… is formed. Which words correctly complete gaps 1 and 2? 1 2 A no element B no compound C some element D some compound

Accepted Answer

D

Question 16

16 Which gases have covalent molecules that contain one or more double bonds?

carbon dioxide ethene hydrogen chloride
A v v v
B v v x
Cc x v v
D x x v

Accepted Answer

B

Question 17

17 What does a word equation show?

the changes that

the speed of

occur in a reaction a reaction
A v v
B v x
Cc x v
D x x

Accepted Answer

B

Question 18

18 Which formula contains the most elements? A NaOH B Rb2S C SiCl 4 D SnO2

Accepted Answer

A

Question 19

19 Urea, (NH2)2CO, is used as a fertiliser. How many atoms or molecules are combined in urea? A atoms: nitrogen, 1; hydrogen, 2; carbon, 2; oxygen, 2 B atoms: nitrogen, 2; hydrogen, 4; carbon, 1; oxygen, 1 C molecules: ammonia, 1; carbon monoxide, 2 D molecules: ammonia, 2; carbon monoxide, 1

Accepted Answer

B

Question 20

20 Copper(II) oxide is mixed with solid Q. On heating the mixture, a reaction occurs and the limewater turns cloudy. copper(II) oxide and solid Q heat limewater What is solid Q? A carbon B iron C sulphur D zinc

Accepted Answer

A

Question 21

21 What is an alloy? A a compound containing two metallic elements B a compound containing two non-metallic elements C a mixture containing two metallic elements D a mixture containing two non-metallic elements

Accepted Answer

C

Question 22

22 Impure copper is purified by electrolysis, as shown. A copper copper aqueous copper(II) sulphate What is the cathode made of and how does its mass change during the electrolysis? the cathode is made of its mass A impure copper decreases B impure copper increases C pure copper decreases D pure copper increases

Accepted Answer

D

Question 23

23 The diagrams show an experiment. powdered powdered copper magnesium dilute hydrochloric acid test-tube 1 test-tube 2 Each element is added until there is no further reaction. Universal Indicator solution is then added to each test-tube. What are the colours of the indicator in the two test-tubes? test-tube 1 test-tube 2 A blue green B blue red C red green D red red

Accepted Answer

C

Question 24

24 When a mixture of hydrogen and oxygen is ignited, an explosive reaction occurs and water is
formed.

Which terms describe this reaction?

combustion redox

00 DW >
«x O* &
x \ x

Accepted Answer

A

Question 25

25 Which diagram shows that an electrolyte is present? A B key battery solid solid electrical contacts C D unlit lamp lit lamp solution solution

Accepted Answer

D

Question 26

26 Which energy sources burn fossil fuels? 1 a coal-fired power station 2 a nuclear power station 3 an oil-fired power station A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

Accepted Answer

B

Question 27

27 Some plastics have long chain molecules that are made from molecules called X. The molecules of X are most commonly obtained from Y. What are X and Y? X Y A monomers coal B monomers oil C polymers coal D polymers oil

Accepted Answer

B

Question 28

28 Two digital stopwatches X and Y, which record in minutes and seconds, are used to time a race. The readings of the two stopwatches, at the start and at the end of the race, are shown. start end X 00:00 00:40 start end Y 01:30 02:20 Which statement about the time of the race is correct? A Both stopwatches recorded the same time interval. B Stopwatch X recorded 10 s longer than stopwatch Y. C Stopwatch Y recorded 10 s longer than stopwatch X. D Stopwatch Y recorded 50 s longer than stopwatch X.

Accepted Answer

C

Question 29

29 A car travels at various speeds during a short journey. The table shows the distances travelled and the time taken during each of four stages P, Q, R and S. stage P Q R S distance travelled / km 1.8 3.6 2.7 2.7 time taken / minutes 2 2 4 3 During which two stages is the car travelling at the same speed? A P and Q B P and S C Q and R D R and S

Accepted Answer

B

Question 30

30 Two identical measuring cylinders containing different liquids are placed on a simple balance. They balance as shown. liquid X volume = 200 cm3 liquid Y volume = 100 cm3 How does the density of X compare with the density of Y? A density of X = 2 1  × density of Y B density of X = density of Y C density of X = 2 × density of Y D density of X = 4 × density of Y

Accepted Answer

A

Question 31

31 A student carries out an experiment to plot the extension-load graph for a spring. The diagrams show the apparatus at the start of the experiment and with a load added. start with load added x y What is the extension caused by the load? A x B y C y + x D y – x

Accepted Answer

D

Question 32

32 The diagram shows water stored behind a dam. dam water turbine generator water The water flows to a turbine and turns a generator. Which sequence for the conversion of energy is correct? A potential energy → kinetic energy → electrical energy B kinetic energy → potential energy → electrical energy C potential energy → electrical energy → kinetic energy D kinetic energy → electrical energy → potential energy

Accepted Answer

A

Question 33

33 A rubber ball is dropped from a height of 2 metres onto a table. Whilst in contact with the table, some of its energy is converted into heat energy. What is the highest possible point the ball could reach after bouncing? 4 m A height B ball released from this height C 2 m D 0 table

Accepted Answer

D

Question 34

34 An engineer wants to fix a steel washer onto a steel rod. The rod is just too big to fit into the hole of the washer. steel steel rod washer How can the engineer fit the washer onto the rod? A Cool the washer and put it over the rod. B Cool the washer and rod to the same temperature and push them together. C Heat the rod and then place it in the hole. D Heat the washer and then place it over the rod.

Accepted Answer

D

Question 35

35 A white plastic lid is placed on a plastic cup used for a hot drink. lid hot drink This would have no effect on the loss of heat by A conduction. B convection. C evaporation. D radiation.

Accepted Answer

A

Question 36

36 In the diagram, the distance OP is the focal length of the lens. Through which point will the ray shown pass, after refraction by the lens? lens A O P D B focal length focal length C

Accepted Answer

A

Question 37

37 The table shows the voltage and current ratings for four electric heaters. Which heater has the least resistance? voltage / V current / A A 110 5.0 B 110 10.0 C 230 5.0 D 230 10.0

Accepted Answer

B

Question 38

38 In the circuit below, X and Y are identical 6 V lamps. 6 V switch X Y What happens when the switch is closed (switched on)? A X lights more brightly than Y. B Y lights more brightly than X. C X and Y both light with full brightness. D X and Y both light with half brightness.

Accepted Answer

C

Question 39

39 Two different systems are used to transmit equal amounts of electrical power from one building to another. One system uses low voltage and the other uses high voltage. Which line in the table is correct about which system wastes least energy and why? least energy wasted why A high voltage system the current in the wires is bigger B high voltage system the current in the wires is smaller C low voltage system the current in the wires is bigger D low voltage system the current in the wires is smaller

Accepted Answer

B

Question 40

40 Which type of radiation can be stopped by a sheet of paper? A alpha-particles B beta-particles C gamma-rays D X-rays

Accepted Answer

A

Question paper20 pages

Mark scheme2 pages

Questions as text

Q1 · The diagram shows a mesophyll cell from a green plant

Q2 · The diagram shows a leaf in sunlight and some of the substances that diffuse into and out…

Q3 · The diagrams show an experiment on enzyme activity

Q4 · In which way do plants usually take in water from their surroundings?

Q5 · A series of tests on a white liquid gave the following results

Q6 · The diagram shows the thorax

Q7 · The diagram shows a section through the human heart

Q8 · A plant shoot is left for several hours in a solution of red dye

Q9 · Which sequence shows the path of a signal through the nervous system when a person…

Q10 · Which event that happens in the ovary of a flower starts seed formation?

Q11 · Which is not responsible for variation in characteristics in a plant?

Q12 · The diagram shows part of the carbon cycle

Q13 · Which are possible harmful effects of deforestation?

Q14 · The symbol for an atom of neon is 20 10Ne

Q15 · On heating iron and sulphur together, the mixture starts to glow

Q16 · Which gases have covalent molecules that contain one or more double bonds?

Q17 · What does a word equation show?

Q18 · Which formula contains the most elements?

Q19 · Urea, (NH2)2CO, is used as a fertiliser

Q20 · Copper(II) oxide is mixed with solid Q

Q21 · What is an alloy?

Q22 · Impure copper is purified by electrolysis, as shown

Q23 · The diagrams show an experiment

Q24 · When a mixture of hydrogen and oxygen is ignited, an explosive reaction occurs and water…

Q25 · Which diagram shows that an electrolyte is present?

Q26 · Which energy sources burn fossil fuels?

Q27 · Some plastics have long chain molecules that are made from molecules called X

Q28 · Two digital stopwatches X and Y, which record in minutes and seconds, are used to time a…

Q29 · A car travels at various speeds during a short journey

Q30 · Two identical measuring cylinders containing different liquids are placed on a simple…

Q31 · A student carries out an experiment to plot the extension-load graph for a spring

Q32 · The diagram shows water stored behind a dam

Q33 · A rubber ball is dropped from a height of 2 metres onto a table

Q34 · An engineer wants to fix a steel washer onto a steel rod

Q35 · A white plastic lid is placed on a plastic cup used for a hot drink

Q36 · In the diagram, the distance OP is the focal length of the lens

Q37 · The table shows the voltage and current ratings for four electric heaters

Q38 · In the circuit below, X and Y are identical 6 V lamps

Q39 · Two different systems are used to transmit equal amounts of electrical power from one…

Q40 · Which type of radiation can be stopped by a sheet of paper?

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