Cambridge IGCSE Sciences - Co-ordinated (Double) 0654 — 2017 Oct/Nov Paper 2 · Variant 2

Question 1

1 What is homeostasis? A the maintenance of the body’s external environment B the maintenance of the body’s internal environment C the processes that produce heat in the body D the removal of wastes from the body

Accepted Answer

B

Question 2

2 What is excretion? A breakdown of materials in kidney cells B chemical reactions in liver cells C removal of undigested food from the gut D removal of waste products

Accepted Answer

D

Question 3

3 What would increase the risk of coronary heart disease? A reduced salt diet B relaxation therapy C regular exercise D smoking tobacco

Accepted Answer

D

Question 4

4 Which statements about X chromosomes in humans are correct?

present in present in
body cells in body cells of carry genes
males females
A v v v
B v x v
Cc J x x
D x v x

Accepted Answer

A

Question 5

5 The test-tube shows gelatine with a layer of black dye. The dye can diffuse through the gelatine. gelatine black dye What was the appearance of the test-tube after six hours? A B C D

Accepted Answer

D

Question 6

6 Which component of cigarette smoke can bind to haemoglobin and reduce the ability of the blood to carry oxygen? A carbon monoxide B nicotine C smoke particles D tar

Accepted Answer

A

Question 7

7 When a suspension of powdered milk is completely digested by a protease enzyme it becomes clear. The graph shows the time taken for a mixture of protease and powdered milk to clear at different temperatures. time for mixture to clear 0 10 20 30 40 50 temperature / °C What is this enzyme’s optimum temperature? A 5 °C B 37 °C C 40 °C D 50 °C

Accepted Answer

C

Question 8

8 What is a function of bile? A emulsifying carbohydrates to decrease the surface area for the action of enzymes B emulsifying carbohydrates to increase the surface area for the action of enzymes C emulsifying fats to decrease the surface area for the action of enzymes D emulsifying fats to increase the surface area for the action of enzymes

Accepted Answer

D

Question 9

9 Predators that hunt at night have large eyes and ears. This has resulted from the passing on of genes by the best-adapted organisms. What is this process called? A artificial selection B conservation C homeostasis D natural selection

Accepted Answer

D

Question 10

10 Why might auxins be used in the commercial growth of plants? A to increase uptake of carbon dioxide for increased photosynthesis B to reduce the amount of water needed by the plants C to regulate growth of particular parts of the plants D to stimulate production of chlorophyll for increased yield

Accepted Answer

C

Question 11

11 A plant has a flower with a feathery, exposed stigma. What does this tell us about the plant? A It is insect-pollinated. B It is wind-pollinated. C Its fruits are animal-dispersed. D Its fruits are wind-dispersed.

Accepted Answer

B

Question 12

12 Lichens grow on the bark of trees. Lichen growth can be affected by sulfur dioxide and other pollutants. Their absence is often used as an indicator of pollution. The table shows the percentage cover of lichens at distances from the centre of a large city. distance from percentage cover by city centre / km lichens on the bark 0 3 5 10 8 15 12 30 20 40 Which conclusion can be made from these results? A Lichen growth is reduced by sulfur dioxide. B Lichens cannot survive in the city. C Lichens grow better further away from the city centre. D Lichens grow equally well on all species of trees.

Accepted Answer

C

Question 13

13 Which statement about food chains is correct? A A carnivore is a consumer that gets its energy from plants. B A carnivore is a producer that gets its energy from animals. C A herbivore is a consumer that gets its energy from plants. D A herbivore is a producer that gets its energy from animals.

Accepted Answer

C

Question 14

14 Which row describes the melting point and boiling point of salt water? melting point / °C boiling point / °C A 0 less than 100 B 0 100 C less than 0 more than 100 D more than 0 100

Accepted Answer

C

Question 15

15 Which statement about fractional distillation is correct? A A chemical change occurs because new substances are formed. B A chemical change occurs because no new substances are formed. C A physical change occurs because new substances are formed. D A physical change occurs because no new substances are formed.

Accepted Answer

D

Question 16

16 Hand warmers keep hands warm on a cold day. Which statement describes how hand warmers work? A An endothermic process occurs in which chemical energy is transformed into thermal energy. B An endothermic process occurs in which thermal energy is transformed into chemical energy. C An exothermic process occurs in which chemical energy is transformed into thermal energy. D An exothermic process occurs in which thermal energy is transformed into chemical energy.

Accepted Answer

C

Question 17

17 Ammonia is oxidised as shown. platinum wire ammonia oxides of nitrogen + + air water vapour heat The platinum is chemically unchanged at the end of the reaction. What is the reason for using platinum? A to absorb the heat from the reaction B to filter out oxygen from the air C to increase the rate of the reaction D to neutralise the ammonia

Accepted Answer

C

Question 18

18 Which equation shows iron or one of its compounds being reduced? A 2FeCl 2  +  Cl 2  →  2FeCl 3 B Fe  +  CuSO4  →  FeSO4  +  Cu C Fe  +  H2SO4  →  FeSO4  +  H2O D FeSO4  +  Mg  →  MgSO4  +  Fe

Accepted Answer

D

Question 19

19 Which substances react with dilute sulfuric acid to form a salt?

magnesium
oxide

magnesium
carbonate

magnesium
chloride

magnesium

v v

~*~ KKK

v x
x v
v v

Accepted Answer

A

Question 20

20 Which statement about Group I elements is not correct? A Caesium and rubidium are electrical conductors. B Caesium is softer than lithium. C Potassium has a higher melting point than rubidium. D Sodium is more reactive than rubidium.

Accepted Answer

D

Question 21

21 Sodium is a metal in Group I of the Periodic Table. Some of the properties of sodium are listed. 1 It conducts electricity. 2 It forms white compounds. 3 It forms a basic oxide. 4 It is malleable. Nickel is a transition metal. Which properties are shown by nickel as well as by sodium? A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

Accepted Answer

C

Question 22

22 Which reaction does not occur in the blast furnace? A C  +  O2  →  CO2 B C  +  CO2  →  2CO C 4Fe  +  3O2  →  2Fe2O3 D Fe2O3  +  3CO  →  2Fe  +  3CO2

Accepted Answer

C

Question 23

23 Gases from a car engine pass through the catalytic converter in the exhaust system of the car. Which gases are at lower concentrations when they leave the catalytic converter? A carbon dioxide and nitrogen B carbon dioxide and nitrogen oxides C carbon monoxide and nitrogen D carbon monoxide and nitrogen oxides

Accepted Answer

D

Question 24

24 Which row shows the conditions used for making sulfur trioxide in the Contact process? temperature pressure catalyst / °C / atm A 450 2 V2O5 B 450 200 Fe C 1000 2 V2O5 D 1000 200 Fe

Accepted Answer

A

Question 25

25 Which word equation describes the manufacture of lime from limestone? A calcium carbonate  →  calcium hydroxide  +  carbon dioxide B calcium carbonate  →  calcium oxide  +  carbon dioxide C calcium hydroxide  →  calcium oxide  +  water D calcium oxide  +  carbon dioxide  →  calcium carbonate

Accepted Answer

B

Question 26

26 What is the structure of but-2-ene? A CH3–CH2–CH=CH2 B CH3–CH=CH–CH3 C CH3–CH=CH2 D CH3–CH2–CH3

Accepted Answer

B

Question 27

27 The structures of four hydrocarbons are shown. 1 2 H H H H H H H H C C C C H H C C C H H H H 3 4 H H H H H H H H C C C C C H H C C H H H H H H H H Which of the hydrocarbons change the colour of aqueous bromine? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Accepted Answer

A

Question 28

28 A car moves with a constant speed of 15 m / s along a road for 20 s. After this, the car is 100 m from where it started, measured in a straight line. Which statement about the car is correct? A It has travelled a distance of 100 m along the road. B It has travelled a distance of 300 m along the road. C Its direction was constant. D Its velocity was constant.

Accepted Answer

B

Question 29

29 A load is applied to a spring. The load is gradually increased from zero until the limit of proportionality of the spring is passed. What must happen as soon as the limit of proportionality is passed? A The extension becomes equal to the original length. B The extension stops increasing. C The spring breaks. D The spring stops obeying Hooke’s Law.

Accepted Answer

D

Question 30

30 What is the definition of efficiency? energy input A × 100% useful energy output energy input B × 100% wasted energy useful energy output C × 100% energy input wasted energy D × 100% energy input

Accepted Answer

C

Question 31

31 A worker carries bricks up a ladder. The following quantities are known. ● the height the bricks are lifted up ● the time taken for the worker to lift the bricks ● the volume of the bricks ● the weight of the bricks Which quantities are needed to calculate the useful power produced by the worker as he carries the bricks up the ladder? A height, time and volume B height, time and weight C height, volume and weight D time, volume and weight

Accepted Answer

B

Question 32

32 Water in a beaker is heated in a laboratory. Which statement about boiling and evaporation of the water is correct? A Boiling and evaporation both occur at any temperature. B Boiling only occurs at the surface of water. C Evaporation only occurs at one temperature. D Evaporation only occurs at the surface of water.

Accepted Answer

D

Question 33

33 Which statement describes why convection is the main method of heat transfer in liquids? A Heating a liquid decreases its density. B Heating a liquid decreases its thermal capacity. C Heating a liquid increases its density. D Heating a liquid increases its thermal capacity.

Accepted Answer

A

Question 34

34 The diagram represents a converging lens forming an image of an object. converging lens object Q R S P image Which distance is the focal length of the lens? A PQ B PR C QR D QS

Accepted Answer

C

Question 35

35 A bar magnet is brought close to an unmagnetised iron rod. One end of the rod becomes an S-pole, as shown. X S magnet iron rod Which pole is at end X of the magnet, and what happens if the magnet is turned round so that end X is on the right? if magnet is pole at end X turned round A N rod is attracted B N rod is repelled C S rod is attracted D S rod is repelled

Accepted Answer

A

Question 36

36 A battery of e.m.f. V is connected across a resistor of resistance R. There is a current in the resistor. V R current Which row shows two changes that both increase the current in the resistor? change 1 change 2 A decrease V decrease R B decrease V increase R C increase V decrease R D increase V increase R

Accepted Answer

C

Question 37

37 The diagram shows a 3.0 Ω resistor connected to a 6.0 V battery. 6.0 V 3.0 Ω How much energy is transferred in the 3.0 Ω resistor in 30 seconds? A 15 J B 60 J C 360 J D 540 J

Accepted Answer

C

Question 38

38 Three charged balls P, Q and R are suspended by insulating threads. Ball P is negatively charged. Ball Q is brought close to ball P. The balls move away from each other. insulating thread P – Q Ball Q is now brought close to ball R. The balls move closer to each other. Q R What are the signs of the charges on ball Q and ball R? ball Q ball R A negative negative B negative positive C positive negative D positive positive

Accepted Answer

B

Question 39

39 The circuit in the diagram contains two resistors. Currents P, Q and R, and potential differences S, T and U are labelled. P R S T Q U Which row shows the relationship between the currents and between the potential differences? potential currents differences A P = Q = R S = T = U B P = Q = R S + T = U C P > Q > R S = T = U D P > Q > R S + T = U

Accepted Answer

B

Question 40

40 The diagrams represent pairs of nuclei of some atoms. Which pair shows nuclei of different isotopes of the same element? A B key neutron proton C D

Accepted Answer

B

Question paper16 pages

Mark scheme3 pages

Questions as text

Question 1

Question 2

Q3 · What would increase the risk of coronary heart disease?

Q4 · Which statements about X chromosomes in humans are correct?

Q5 · The test-tube shows gelatine with a layer of black dye

Q6 · Which component of cigarette smoke can bind to haemoglobin and reduce the ability of the…

Q7 · When a suspension of powdered milk is completely digested by a protease enzyme it becomes…

Q8 · What is a function of bile?

Q9 · Predators that hunt at night have large eyes and ears

Q10 · Why might auxins be used in the commercial growth of plants?

Q11 · A plant has a flower with a feathery, exposed stigma

Q12 · Lichens grow on the bark of trees

Q13 · Which statement about food chains is correct?

Q14 · Which row describes the melting point and boiling point of salt water?

Q15 · Which statement about fractional distillation is correct?

Q16 · Hand warmers keep hands warm on a cold day

Q17 · Ammonia is oxidised as shown

Q18 · Which equation shows iron or one of its compounds being reduced?

Q19 · Which substances react with dilute sulfuric acid to form a salt?

Q20 · Which statement about Group I elements is not correct?

Q21 · Sodium is a metal in Group I of the Periodic Table

Q22 · Which reaction does not occur in the blast furnace?

Q23 · Gases from a car engine pass through the catalytic converter in the exhaust system of the…

Q24 · Which row shows the conditions used for making sulfur trioxide in the Contact process?

Q25 · Which word equation describes the manufacture of lime from limestone?

Q26 · What is the structure of but-2-ene?

Q27 · The structures of four hydrocarbons are shown

Q28 · A car moves with a constant speed of 15 m / s along a road for 20 s

Q29 · A load is applied to a spring

Q30 · What is the definition of efficiency?

Q31 · A worker carries bricks up a ladder

Q32 · Water in a beaker is heated in a laboratory

Q33 · Which statement describes why convection is the main method of heat transfer in liquids?

Q34 · The diagram represents a converging lens forming an image of an object

Q35 · A bar magnet is brought close to an unmagnetised iron rod

Q36 · A battery of e.m.f

Q37 · The diagram shows a 3.0 Ω resistor connected to a 6.0 V battery

Q38 · Three charged balls P, Q and R are suspended by insulating threads

Q39 · The circuit in the diagram contains two resistors

Q40 · The diagrams represent pairs of nuclei of some atoms

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