Cambridge IGCSE Science - Combined 0653 — 2021 May/June Paper 2 · Variant 3

Question 1

1 Which row links a specialised cell to its correct function? specialised cell function A ciliated cell photosynthesis B palisade cell movement of mucus C red blood cell blood clotting D sperm cell reproduction

Accepted Answer

D

Question 2

2 The diagrams represent four similar animal cells immersed in blood plasma. The black dots represent molecules of dissolved oxygen. Which cell will have oxygen molecules diffusing into it most rapidly? A B C D

Accepted Answer

C

Question 3

3 The diagram shows the effect of increasing the pH of an enzyme-controlled reaction. X rate of reaction pH What is happening at point X? 1 denaturation 2 greatest number of enzyme–substrate complexes 3 increased kinetic energy A 1 only B 2 only C 1 and 3 D 2 and 3

Accepted Answer

B

Question 4

4 The leaves of plants produce carbohydrates during photosynthesis.

How are these carbohydrates used by the plants?

for respiration to make other for storage
substances
A Jv x x
B x x Jv
Cc v x JV
D J Jv Jv

Accepted Answer

D

Question 5

5 A person has a low level of haemoglobin. Which row identifies the blood cell that transports oxygen and the nutrient the person is deficient in? type of blood cell nutrient deficiency A red calcium B red iron C white calcium D white iron

Accepted Answer

B

Question 6

6 Most food molecules need to be digested to allow them to be absorbed into the blood. Which row shows the type of digestion and the change needed to allow absorption to happen? type of digestion change to food molecules A chemical large molecules to small, insoluble molecules B chemical large molecules to small, soluble molecules C mechanical large molecules to small, soluble molecules D mechanical large molecules to small, insoluble molecules

Accepted Answer

B

Question 7

7 The diagram shows a cross-section of a root hair cell. Y X Which row identifies the part of the cell with the larger surface area and the correct function? part of cell function A X water and glucose uptake B X water and ion uptake C Y water and glucose uptake D Y water and ion uptake

Accepted Answer

B

Question 8

8 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 9

9 A plant in a pot was placed on its side for four days. shoot root start after four days Which row describes the gravitropic response in the root and shoot? root shoot A positive negative B negative positive C negative negative D positive positive

Accepted Answer

A

Question 10

10 During human reproduction an egg fuses with a sperm. Sometimes the zygote splits into two and produces twins. Which row describes the formation of these twins? original zygote produced by twins A asexual reproduction genetically identical B sexual reproduction genetically identical C asexual reproduction genetically different D sexual reproduction genetically different

Accepted Answer

B

Question 11

11 The diagram shows a wind-pollinated flower. Which label identifies a stigma? B C A D

Accepted Answer

A

Question 12

12 In which food chain does the final consumer receive the most energy from the producer? primary secondary tertiary quaternary A producer     consumer consumer consumer consumer primary secondary tertiary B producer    consumer consumer consumer primary secondary C producer   consumer consumer primary D producer  consumer

Accepted Answer

D

Question 13

13 Which process takes carbon dioxide out of the air? A combustion B decomposition C photosynthesis D plant respiration

Accepted Answer

C

Question 14

14 The melting point and boiling point of oxygen and nitrogen are shown. melting point boiling point / C / C oxygen –219 –183 nitrogen –210 –196 A sealed flask contains a mixture of oxygen and nitrogen. Which diagram shows the arrangement of oxygen and nitrogen particles at –190 C? A B C D key = nitrogen molecules = oxygen molecules

Accepted Answer

A

Question 15

15 During a chromatography investigation, colour X moves 4.5 cm up the chromatography paper from the base line. The Rf value of colour X is 0.59. What is the distance moved by the solvent in this experiment? A 2.7 cm B 4.5 cm C 7.6 cm D 10.3 cm

Accepted Answer

C

Question 16

16 What is an example of a physical change? A carbon dioxide turning limewater milky B the crystallisation of copper(II) sulfate from solution C the electrolysis of molten lead(II) bromide D the thermal decomposition of calcium carbonate

Accepted Answer

B

Question 17

17 Water has the chemical formula H2O. Which statement is correct? A Pure water is a mixture because it contains hydrogen and oxygen. B Pure water is an element because it contains only one type of molecule. C Salt water is a compound because it contains salt and water. D Salt water is a mixture because it contains salt and water.

Accepted Answer

D

Question 18

18 When water boils it changes from a liquid to a gas. Which statement about this process is correct? A It is endothermic because it requires energy to break covalent bonds. B It is endothermic because energy is needed to break attractive forces between molecules. C It is exothermic because it requires energy to break attractive forces between atoms. D It is exothermic because energy is given out when bonds form.

Accepted Answer

B

Question 19

19 In the reaction between an acid and a metal, the rate of reaction decreases as the reaction proceeds. A student suggests three reasons why the rate of this reaction decreases. 1 The concentration of the acid decreases as it gets used up. 2 The energy needed to break bonds is used up as the products form. 3 The surface area of the metal decreases as it gets smaller. Which reasons are correct? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Accepted Answer

C

Question 20

20 Iron is extracted from its oxide using carbon monoxide. The equation is shown. Fe2O3  +  3CO    2Fe  +  3CO2 Which row identifies the reducing agent and explains how it acts as a reducing agent? reducing agent explanation A Fe2O3 it loses mass to become Fe B Fe2O3 it loses oxygen to become Fe C CO it gains mass to become CO2 D CO it removes oxygen from Fe2O3

Accepted Answer

D

Question 21

21 Substances that react together to make zinc salts are listed. 1 zinc carbonate and hydrochloric acid 2 zinc oxide and sulfuric acid 3 zinc and nitric acid 4 zinc hydroxide and hydrochloric acid Which substances produce water when they react? A 1, 2 and 3 B 1, 2 and 4 C 1 and 2 only D 3 and 4

Accepted Answer

B

Question 22

22 Which two substances form a white precipitate when they are mixed? A barium chloride and hydrochloric acid B barium chloride and nitric acid C silver nitrate and hydrochloric acid D silver nitrate and nitric acid

Accepted Answer

C

Question 23

23 Aqueous chlorine is added to aqueous sodium bromide. aqueous chlorine aqueous sodium bromide Which statement about the reaction is correct? A The solution turns orange because bromine is formed. B The solution turns orange because bromide ions are reduced. C The solution remains colourless because bromine is less reactive than chlorine. D The solution remains colourless because chlorine is reduced.

Accepted Answer

A

Question 24

24 How does the character of the elements change across a period of the Periodic Table from left to right? A acidic to basic B basic to acidic C metallic to non-metallic D non-metallic to metallic

Accepted Answer

C

Question 25

25 Four metals, W, X, Y and Z, are added to aqueous solutions of their salts. W displaces Y. Y displaces X. Z displaces Y but does not displace W. Which row shows the reactivity order of the metals? least most reactive reactive A X Y Z W B X Z Y W C W Y Z X D W Z Y X

Accepted Answer

A

Question 26

26 Which statement about greenhouse gases is correct? A Greenhouse gases cause acid rain. B The combustion of fossil fuels produces greenhouse gases. C Nitrogen is a greenhouse gas. D Greenhouse gases are removed from the atmosphere by respiration.

Accepted Answer

B

Question 27

27 Which type of compound contains only carbon and hydrogen? A carbohydrate B carbonate C hydrocarbon D hydroxide

Accepted Answer

C

Question 28

28 Which change cannot be caused by a force acting on an object? A change of mass B change of motion C change of shape D change of size

Accepted Answer

A

Question 29

29 Diagram 1 is a distance–time graph. Diagram 2 and diagram 3 are speed–time graphs. distance speed speed 0 0 0 0 time 0 time 0 time diagram 1 diagram 2 diagram 3 Which of the diagrams represents the motion of an object moving with a non-zero constant acceleration? A 1 and 3 B 1 only C 2 only D 3 only

Accepted Answer

D

Question 30

30 A student does 10 J of work when lifting an object through a vertical distance of 2.0 m. What is the size of the force that the student exerts on the object? A 0.20 N B 5.0 N C 12 N D 20 N

Accepted Answer

B

Question 31

31 Which source of energy is non-renewable? A chemical energy stored in fossil fuels B energy stored in waves C energy stored in water behind a hydroelectric dam D wind energy

Accepted Answer

A

Question 32

32 Cold water evaporates as molecules leave it. Which molecules leave the water and from which part of the water do they leave? molecules that where they leave the water leave from A least energetic the surface only B least energetic throughout the water C most energetic the surface only D most energetic throughout the water

Accepted Answer

C

Question 33

33 A heater creates a convection current in a room. What happens to air as it is heated? A It contracts and its density decreases. B It contracts and its density increases. C It expands and its density decreases. D It expands and its density increases.

Accepted Answer

C

Question 34

34 Which row gives an example of a transverse wave and a longitudinal wave? transverse longitudinal A light wave radio wave B radio wave sound wave C sound wave light wave D sound wave radio wave

Accepted Answer

B

Question 35

35 Which diagram shows a converging lens being used to produce the largest virtual image? (Every point labelled F is a principal focus.) A B object object F F F F C D object object F F F F

Accepted Answer

B

Question 36

36 The speed of sound in air is approximately 330 m / s. The speed of sound in water is approximately 1500 m / s. What is a possible speed of sound in solid iron? A 120 m / s B 330 m / s C 1200 m / s D 5100 m / s

Accepted Answer

D

Question 37

37 The diagram represents a circuit that includes a battery, an ammeter, a voltmeter and a variable resistor. A V What happens to the readings on the meters as the resistance of the variable resistor is increased? ammeter reading voltmeter reading A decreases decreases B decreases stays constant C increases decreases D increases stays constant

Accepted Answer

B

Question 38

38 Which combination of resistors has a combined resistance of 4.00?

A B Cc D

1.00 4.00 6.0Q 200
pe pe |

Accepted Answer

C

Question 39

39 A lamp is labelled 12 V, 25 W. How much electrical energy does the lamp transfer in 4.0 minutes when it is operating at its normal brightness? A 100 J B 1200 J C 6000 J D 72 000 J

Accepted Answer

C

Question 40

40 An air conditioner and a television are both connected to the same electrical circuit. X power air television supply conditioner The current in the air conditioner is 9.0 A and the current in the television is 2.0 A. Several different fuses are available. Which fuse should be connected at X? A 1 A B 3 A C 7 A D 13 A

Accepted Answer

D

Question paper16 pages

Mark scheme3 pages

Questions as text

Q1 · Which row links a specialised cell to its correct function?

Q2 · The diagrams represent four similar animal cells immersed in blood plasma

Q3 · The diagram shows the effect of increasing the pH of an enzyme-controlled reaction

Q4 · The leaves of plants produce carbohydrates during photosynthesis

Q5 · A person has a low level of haemoglobin

Q6 · Most food molecules need to be digested to allow them to be absorbed into the blood

Q7 · The diagram shows a cross-section of a root hair cell

Q8 · What is the maximum number of carbon dioxide molecules produced when four glucose…

Q9 · A plant in a pot was placed on its side for four days

Q10 · During human reproduction an egg fuses with a sperm

Q11 · The diagram shows a wind-pollinated flower

Q12 · In which food chain does the final consumer receive the most energy from the producer?

Q13 · Which process takes carbon dioxide out of the air?

Q14 · The melting point and boiling point of oxygen and nitrogen are shown

Q15 · During a chromatography investigation, colour X moves 4.5 cm up the chromatography paper…

Q16 · What is an example of a physical change?

Q17 · Water has the chemical formula H2O

Q18 · When water boils it changes from a liquid to a gas

Q19 · In the reaction between an acid and a metal, the rate of reaction decreases as the…

Q20 · Iron is extracted from its oxide using carbon monoxide

Q21 · Substances that react together to make zinc salts are listed

Q22 · Which two substances form a white precipitate when they are mixed?

Q23 · Aqueous chlorine is added to aqueous sodium bromide

Q24 · How does the character of the elements change across a period of the Periodic Table from…

Q25 · Four metals, W, X, Y and Z, are added to aqueous solutions of their salts

Q26 · Which statement about greenhouse gases is correct?

Q27 · Which type of compound contains only carbon and hydrogen?

Q28 · Which change cannot be caused by a force acting on an object?

Question 29

Q30 · A student does 10 J of work when lifting an object through a vertical distance of 2.0 m

Q31 · Which source of energy is non-renewable?

Q32 · Cold water evaporates as molecules leave it

Q33 · A heater creates a convection current in a room

Q34 · Which row gives an example of a transverse wave and a longitudinal wave?

Q35 · Which diagram shows a converging lens being used to produce the largest virtual image?

Q36 · The speed of sound in air is approximately 330 m / s

Q37 · The diagram represents a circuit that includes a battery, an ammeter, a voltmeter and a…

Q38 · Which combination of resistors has a combined resistance of 4.00?

Q39 · A lamp is labelled 12 V, 25 W

Q40 · An air conditioner and a television are both connected to the same electrical circuit

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