Cambridge IGCSE Science - Combined 0653 — 2022 May/June Paper 2 · Variant 1

Question 1

1 What is the outermost layer of an animal cell and a plant cell? animal cell plant cell A cell membrane cell membrane B cell membrane cell wall C cell wall cell membrane D cell wall cell wall

Accepted Answer

B

Question 2

2 The plant cell in the diagram is in a concentrated salt solution. Which arrow represents osmosis? B A D C

Accepted Answer

D

Question 3

3 The enzyme salivary amylase starts digesting starchy foods in the mouth. This stops when the food reaches the stomach. Why does this happen? A The acid in the stomach slows down all reactions. B The shape of the active site of the enzyme is altered by the low pH. C The kinetic energy of molecules is reduced by acids. D The shape of the substrate molecules is changed.

Accepted Answer

B

Question 4

4 Which foods are rich in carbohydrate? 1 eggs 2 meat 3 potatoes 4 rice A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Accepted Answer

D

Question 5

5 Which row is correct for a protease enzyme? where secreted molecule acted on end product A stomach protein amino acids B pancreas protein fatty acid and glycerol C stomach lipids amino acids D pancreas lipids fatty acid and glycerol

Accepted Answer

A

Question 6

6 The diagram shows the circulation of blood through the heart, lungs and other organs. lungs 4 1 3 heart 2 other organs Which row gives a correct comparison of oxygen concentration in the blood in two of the numbered vessels? lower oxygen higher oxygen concentration concentration A 1 2 B 1 3 C 3 4 D 4 2

Accepted Answer

D

Question 7

7 Which row shows the features of an efficient gas exchange surface in mammals? alveoli wall blood supply surface area A thick low large B thick high small C thin high large D thin low small

Accepted Answer

C

Question 8

8 Physical activity affects our rate and depth of breathing. What happens during increased physical activity? rate of breathing depth of breathing A decreases decreases B decreases increases C increases decreases D increases increases

Accepted Answer

D

Question 9

9 Which responses occur as a result of adrenaline secretion?

increased decreased increased
breathing rate | pupil diameter pulse rate
A v x x
B J x J
Cc x Jv J
D x Jv x

key
JY = does occur

X = does not occur

Accepted Answer

B

Question 10

10 A plant seedling is pinned horizontally onto a damp board inside a light-proof box. The diagrams show the seedling at the start of the experiment and after 72 hours. start of experiment after 72 hours light-proof box root shoot pin damp board Which response is shown by the root and the shoot? root shoot A gravitropism gravitropism B gravitropism phototropism C phototropism gravitropism D phototropism phototropism

Accepted Answer

A

Question 11

11 During sexual intercourse the penis transfers sperm cells to the vagina. What is the pathway for sperm cells from their site of production to the vagina? A sperm ducts  testes  urethra  vagina B testes  sperm ducts  urethra  vagina C testes  urethra  sperm ducts  vagina D urethra  testes  sperm ducts  vagina

Accepted Answer

B

Question 12

12 The diagram shows part of a food web. fox eagle stoat rabbit small bird caterpillar ant beetle locust grass flowering plant tree Which animal is a quaternary consumer only? A eagle B fox C locust D small bird

Accepted Answer

A

Question 13

13 In the process of eutrophication, what causes the increased growth of producers? A increased carbon dioxide availability B increased decomposition C increased nitrate ion availability D increased oxygen availability

Accepted Answer

C

Question 14

14 Which row describes a chemical change? test result A one end of a piece of aluminium is heated the other end gets hot B calcium carbonate is heated carbon dioxide is made C a piece of iron is heated it becomes more malleable D a beaker of water is heated steam is made

Accepted Answer

B

Question 15

15 What describes a solvent? A a solid that dissolves in a liquid B the amount of solid that dissolves in a liquid C the liquid in which a solid dissolves D the mixture formed when a solid dissolves in a liquid

Accepted Answer

C

Question 16

16 The formula of sodium phosphate is Na3PO4. The formula of aluminium chloride is Al Cl 3. What is the formula of aluminium phosphate? A Al PO4 B Al (PO4)3 C Al 2(PO4)3 D Al 3PO4

Accepted Answer

A

Question 17

17 Magnesium reacts with dilute hydrochloric acid. Which statement explains why the rate of this reaction increases when the concentration of the acid is increased? A A greater proportion of the particles have the minimum energy to react. B The particles are closer together and the particles collide more frequently. C The particles collide more frequently and more of the particles have the minimum energy to react. D The particles collide more frequently and the activation energy of the reaction is reduced.

Accepted Answer

B

Question 18

18 In which equation is the underlined substance acting as an oxidising agent? A CaCO3  +  2HCl    CaCl 2  +  CO2  +  H2O B Fe2O3  +  3CO    2Fe  +  3CO2 C 2Mg  +  O2    2MgO D ZnO  +  C    Zn  +  CO

Accepted Answer

D

Question 19

19 Three powders are added to dilute sulfuric acid, as shown.

magnesium
powder

dilute
sulfuric acid

Which powders react to produce water?

magnesium

oxide
powder

dilute
sulfuric acid

magnesium

magnesium
oxide

x \ x

magnesium
carbonate

\ \ x

magnesium
carbonate
powder

dilute
sulfuric acid

key
¥ = does produce water

X = does not produce water

Accepted Answer

C

Question 20

20 Elements X, Y and Z are in Group I of the Periodic Table. Some information about these elements is shown. melting point density / C g / cm3 X 1.53 Y 98 Z 63 0.86 Which row correctly identifies elements X, Y and Z? X Y Z A potassium sodium rubidium B rubidium potassium sodium C rubidium sodium potassium D sodium rubidium potassium

Accepted Answer

C

Question 21

21 The results of two tests on substance Q are shown. test result add dilute hydrochloric acid bubbles of colourless gas, R, to solid Q which turns limewater milky add aqueous sodium hydroxide green precipitate to a solution of Q Which cation is present in Q and what is gas R? cation present in Q gas R A iron(II) carbon dioxide B iron(II) chlorine C iron(III) carbon dioxide D iron(III) chlorine

Accepted Answer

A

Question 22

22 The equation for the reaction between zinc and aqueous iron(II) sulfate is shown. Zn(s)  +  FeSO4(aq)    ZnSO4(aq)  +  Fe(s) Which statements about this reaction are correct? 1 Zinc atoms give electrons to iron ions. 2 Iron atoms have a greater tendency to form positive ions than zinc atoms. 3 Zinc displaces iron because it is more reactive than iron. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

Accepted Answer

B

Question 23

23 Iron is extracted from hematite in the blast furnace. Coke and hematite are added at the top of the blast furnace, and hot air enters at the bottom. Which statements are correct? 1 Coke burns to produce high temperatures. 2 Carbon monoxide is formed by the reaction of carbon with carbon dioxide. 3 Hematite contains iron(III) oxide which is oxidised by carbon monoxide. 4 The oxygen needed for the combustion of the coke comes from the hematite. A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4

Accepted Answer

A

Question 24

24 Which statement about a chemical test for water is correct? A Anhydrous cobalt(II) chloride turns blue. B Anhydrous cobalt(II) chloride turns white. C Anhydrous copper(II) sulfate turns blue. D Anhydrous copper(II) sulfate turns white.

Accepted Answer

C

Question 25

25 Alkenes are hydrocarbons that belong to the same homologous series. What are the general properties of a homologous series? 1 same general formula 2 same melting point 3 similar chemical properties A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

Accepted Answer

B

Question 26

26 Methane, ethane and propane are all alkanes. Their formulae are shown. methane, CH4 ethane, C2H6 propane, C3H8 Which statement is not correct? A All three compounds are hydrocarbons. B All three compounds burn. C Methane is the main constituent of natural gas. D Propane burns completely to form carbon dioxide and hydrogen.

Accepted Answer

D

Question 27

27 Which substance rapidly turns aqueous bromine from orange to colourless? A ethane B ethanol C ethene D methane

Accepted Answer

C

Question 28

28 Which statement about forces is always correct? A A resultant force is needed to keep an object moving at constant speed in a straight line. B Air resistance acting on an object falling in still air causes its speed to increase. C Friction on an object sliding along rough ground acts in the opposite direction to its motion. D No forces act on any object that is at rest.

Accepted Answer

C

Question 29

29 A table of mass 20 kg is supported on four legs. The area of contact between each leg and the ground is 1.0 × 10–3 m2. The value of the gravitational field strength g is 10 N / kg. How much pressure is exerted on the ground by each leg? A 5000 Pa B 20 000 Pa C 50 000 Pa D 200 000 Pa

Accepted Answer

C

Question 30

30 The diagram shows an extension–load graph for a spring. Which labelled point is the limit of proportionality of the spring? D extension C B A 0 0 load

Accepted Answer

B

Question 31

31 A boy of mass 80 kg is running at a speed of 4.0 m / s. What is his kinetic energy? A 160 J B 320 J C 640 J D 1280 J

Accepted Answer

C

Question 32

32 A mechanic cannot remove a large steel nut from a steel bolt because it is too tight. bolt nut What does the mechanic do to help remove the nut? A cool the nut and heat the bolt B heat the bolt only C heat the nut and the bolt through the same temperature rise D heat the nut only

Accepted Answer

D

Question 33

33 A metal rod is heated at one end. Thermal energy moves from the hotter end to the colder end. How do molecules and free electrons transfer thermal energy along the rod? molecules free electrons A move from the hotter end move from the hotter end to the colder end to the colder end B move from the hotter end pass kinetic energy to the colder end to neighbouring electrons C pass kinetic energy move from the hotter end to neighbouring molecules to the colder end D pass kinetic energy pass kinetic energy to neighbouring molecules to neighbouring electrons

Accepted Answer

C

Question 34

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

Accepted Answer

D

Question 35

35 Which region of the electromagnetic spectrum is used in remote controllers to control a television? A microwaves B infrared C ultraviolet D visible light

Accepted Answer

B

Question 36

36 Where does sound travel at the greatest speed? A in a gas B in a liquid C in a solid D in a vacuum

Accepted Answer

C

Question 37

37 Two balloons X and Y are suspended by insulating threads. They are each held near a negatively charged balloon. The balloons hang as shown. insulating insulating threads threads – – – – – – – – – – – – – X – – Y ––– – – – – – – What is the charge on balloon X and what is the charge on balloon Y? balloon X balloon Y A negative negative B negative positive C positive negative D positive positive

Accepted Answer

B

Question 38

38 A circuit contains two lamps and a variable resistor. lamp 1 lamp 2 The resistance of the variable resistor is increased. What happens to the brightness of lamp 1 and what happens to the brightness of lamp 2? brightness of lamp 1 brightness of lamp 2 A decreases decreases B decreases increases C no change decreases D no change increases

Accepted Answer

A

Question 39

39 The diagram shows a circuit that includes three resistors, a battery and three voltmeters. Readings V1, V2 and V3 on the voltmeters, and currents I1, I2 and I3, are labelled. reading = V1 V I1 I2 V V reading = V2 reading = V3 I3 Which row gives the relationships between the currents and between the voltages? currents voltages A I1 = I2 + I3 V1 = V2 + V3 B I1 = I2 + I3 V1 + V2 = V3 C I1 + I2 = I3 V1 = V2 + V3 D I1 + I2 = I3 V1 + V2 = V3

Accepted Answer

A

Question 40

40 There is a current I in a resistor when there is a potential difference (p.d.) V across it. Which quantity is equal to the product IV ? A the charge passing through the resistor B the energy transferred in the resistor C the power transferred in the resistor D the resistance of the resistor

Accepted Answer

C

Question paper16 pages

Mark scheme3 pages

Questions as text

Q1 · What is the outermost layer of an animal cell and a plant cell?

Q2 · The plant cell in the diagram is in a concentrated salt solution

Q3 · The enzyme salivary amylase starts digesting starchy foods in the mouth

Q4 · Which foods are rich in carbohydrate?

Q5 · Which row is correct for a protease enzyme?

Q6 · The diagram shows the circulation of blood through the heart, lungs and other organs

Q7 · Which row shows the features of an efficient gas exchange surface in mammals?

Q8 · Physical activity affects our rate and depth of breathing

Q9 · Which responses occur as a result of adrenaline secretion?

Q10 · A plant seedling is pinned horizontally onto a damp board inside a light-proof box

Q11 · During sexual intercourse the penis transfers sperm cells to the vagina

Q12 · The diagram shows part of a food web

Q13 · In the process of eutrophication, what causes the increased growth of producers?

Q14 · Which row describes a chemical change?

Q15 · What describes a solvent?

Q16 · The formula of sodium phosphate is Na3PO4

Q17 · Magnesium reacts with dilute hydrochloric acid

Q18 · In which equation is the underlined substance acting as an oxidising agent?

Q19 · Three powders are added to dilute sulfuric acid, as shown

Q20 · Elements X, Y and Z are in Group I of the Periodic Table

Q21 · The results of two tests on substance Q are shown

Q22 · The equation for the reaction between zinc and aqueous iron(II) sulfate is shown

Q23 · Iron is extracted from hematite in the blast furnace

Q24 · Which statement about a chemical test for water is correct?

Q25 · Alkenes are hydrocarbons that belong to the same homologous series

Q26 · Methane, ethane and propane are all alkanes

Q27 · Which substance rapidly turns aqueous bromine from orange to colourless?

Q28 · Which statement about forces is always correct?

Q29 · A table of mass 20 kg is supported on four legs

Q30 · The diagram shows an extension–load graph for a spring

Q31 · A boy of mass 80 kg is running at a speed of 4.0 m / s

Q32 · A mechanic cannot remove a large steel nut from a steel bolt because it is too tight

Q33 · A metal rod is heated at one end

Q34 · Light travels at a speed of 3.0  108 m / s in a vacuum

Q35 · Which region of the electromagnetic spectrum is used in remote controllers to control a…

Q36 · Where does sound travel at the greatest speed?

Q37 · Two balloons X and Y are suspended by insulating threads

Q38 · A circuit contains two lamps and a variable resistor

Q39 · The diagram shows a circuit that includes three resistors, a battery and three voltmeters

Q40 · There is a current I in a resistor when there is a potential difference (p.d.) V across it

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