Cambridge IGCSE Sciences - Co-ordinated (Double) 0654 — 2022 Feb/March Paper 2 · Variant 2

Question 1

1

Plant nutrition needs light and water.

Which row shows what else needs to be taken in?

x
v
v

carbon organic
dioxide compounds
v v

v
x
x

Accepted Answer

C

Question 2

2 The diagram shows a cell starting to plasmolyse. X Y Z In which direction is osmosis occurring? A X to Y B Y to X C Y to Z D Z to Y

Accepted Answer

D

Question 3

3 Which chemical element is found in all proteins, but not in all carbohydrates or fats? A carbon B hydrogen C oxygen D nitrogen

Accepted Answer

D

Question 4

4 The Pompeii worm lives in deep-sea hydrothermal vents where average temperatures are often as high as 68 C. Which graph represents the activity of enzymes found in the Pompeii worm? A B rate of rate of reaction reaction 0 10 20 30 40 50 60 70 80 90 0 10 20 30 40 50 60 70 80 90 temperature / °C temperature / °C C D rate of rate of reaction reaction 0 10 20 30 40 50 60 70 80 90 0 10 20 30 40 50 60 70 80 90 temperature / °C temperature / °C

Accepted Answer

B

Question 5

5 A plant has leaves which have white parts and green parts. One of the leaves is partly covered by
a piece of black card on both sides. The plant is left in the light for two days.

white part of leaf

green part of leaf

position of black card
The leaf is then removed and tested for the presence of starch.

Which row is correct?

key
/¥ = starch present

X = starch absent

09 WD >

\ & & \] TU
x \ & «10
\ & \ x 1]
\ & & \ ] Oo

Accepted Answer

C

Question 6

6 What is assimilation? A the movement of digested food molecules into the cells of the body where they are used, becoming part of the cells B the movement of digested food molecules through the wall of the intestine into the blood C the passing out of food that has not been digested, as faeces, through the anus D the taking of food and drink into the body through the mouth

Accepted Answer

A

Question 7

7

The diagram shows a plant shoot that is ringed. This removes the phloem from a section of the
shoot.

P

ringed section with
phloem removed

Q

The plant is left in bright light for 24 hours. Plant tissues are then tested for the presence of
sucrose above the ringed section at P and below the ringed section at Q.

Which row shows the expected results?

presence of sucrose
P Q

Accepted Answer

C

Question 8

8 The diagram shows the main structures in the breathing system of humans. S R P Q Which row identifies the larynx, bronchus, trachea and bronchioles? larynx bronchus trachea bronchioles A P Q R S B R P S Q C S P R Q D S Q P R

Accepted Answer

C

Question 9

9 The diagram shows a section through the skin. 1 4 2 3 Which labelled structures help to maintain body temperature in the cold? A 1 and 3 B 1 and 4 C 2 and 3 D 3 and 4

Accepted Answer

A

Question 10

10 Which statements correctly describe the human male gamete? 1 contains enzymes 2 food stores present 3 flagellum present 4 surrounded by a jelly coating A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4

Accepted Answer

B

Question 11

11 The table gives statements about a human haploid nucleus.

Which row is correct?

a single set

of unpaired found in produced by
chromosomes gametes mitosis
A x x v key
6 v v x / = true
c x v v X = false
D WA x x

Accepted Answer

B

Question 12

12 What is the main factor which determines the number of trophic levels in food chains? A competition between organisms B efficiency of energy transfer between trophic levels C removal of a member of a food chain D unstable ecosystem due to changing environment

Accepted Answer

B

Question 13

13 Which row shows an effect of a human activity on the environment? activity effect A cutting down forests acid rain B cutting down forests eutrophication C overuse of fertilisers acid rain D overuse of fertilisers eutrophication

Accepted Answer

D

Question 14

14 Substance P is separated into different parts using simple physical techniques. Substance Q is only separated into simpler parts using chemical processes. Substance R is not separated into simpler parts by either physical or chemical processes. Which type of substance are P, Q and R? P Q R A compound mixture element B element compound mixture C mixture element compound D mixture compound element

Accepted Answer

D

Question 15

15 Hydrogen chloride is a gas. It dissolves in water to form an acidic solution. Three different samples of hydrogen chloride are listed. 1 73.0 g of hydrogen chloride gas 2 7.30 dm3 of hydrogen chloride gas at r.t.p. 3 730 cm3 of 1.00 mol / dm3 aqueous hydrogen chloride Which row shows the relative number of moles of hydrogen chloride in these samples? fewest most A 1 2 3 B 1 3 2 C 2 3 1 D 3 2 1

Accepted Answer

C

Question 16

16 Aluminium is extracted from aluminium oxide by electrolysis. What is added to aluminium oxide in this process? A concentrated aqueous sodium chloride B cryolite C dilute sulfuric acid D water

Accepted Answer

B

Question 17

17 Which statements about the reduction of copper(II) oxide by heating with carbon are correct? 1 Copper(II) ions lose electrons. 2 Copper(II) oxide acts as an oxidising agent. 3 Copper(II) oxide loses oxygen. 4 Oxide ions are reduced. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Accepted Answer

C

Question 18

18 Copper carbonate is insoluble in water. Which method can be used to make copper carbonate? A adding aqueous sodium carbonate to aqueous copper sulfate and filtering off the product B adding solid calcium carbonate to aqueous copper sulfate and filtering off the product C adding solid copper oxide to solid calcium carbonate and heating the mixture D heating copper metal in carbon dioxide

Accepted Answer

A

Question 19

19 Which test and its result identifies aqueous bromide ions? A adding acidified aqueous silver nitrate forming a cream precipitate B adding acidified aqueous silver nitrate forming a white precipitate C adding aluminium foil and heating with sodium hydroxide forming a gas that turns red litmus paper blue D adding dilute acid forming a gas that produces a white precipitate when bubbled through limewater

Accepted Answer

A

Question 20

20 Which row about the trends in the elements going down Group I of the Periodic Table is correct? reactivity melting point A decreases decreases B decreases increases C increases decreases D increases increases

Accepted Answer

C

Question 21

21 An airship containing an unreactive gas floats in air, as shown. Which gas is used to fill the airship? A carbon dioxide B helium C hydrogen D nitrogen

Accepted Answer

B

Question 22

22 Duralumin and magnalium are alloys used in the manufacture of aircraft. They both contain aluminium and another metallic element. The alloys are made up of ……1…… of each element. They are used because they are ……2…… than the pure metals. Which words complete gaps 1 and 2? 1 2 A atoms harder B atoms softer C molecules harder D molecules softer

Accepted Answer

A

Question 23

23 Iron is extracted in the blast furnace. Which reactions are involved in removing acidic impurities as slag? 1 C  +  O2    CO2 2 C  +  CO2    2CO 3 Fe2O3  +  3CO    2Fe  +  3CO2 4 CaCO3    CaO  +  CO2 5 CaO  +  SiO2    CaSiO3 A 1 and 2 only B 1, 2 and 3 C 3, 4 and 5 D 4 and 5 only

Accepted Answer

D

Question 24

24 Which statements about the reactions in a catalytic converter are correct? 1 The catalyst needs to be hot for the reactions to work. 2 Carbon dioxide is converted to carbon monoxide. 3 It converts pollutant gases into gases present in clean air. 4 Nitrogen and oxygen combine to form nitrogen monoxide. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Accepted Answer

B

Question 25

25 Which substances neutralise acids? 1 lime 2 limestone 3 calcium hydroxide A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

Accepted Answer

D

Question 26

26 Which statements about ethene and but-1-ene are correct? 1 Only ethene reacts with bromine water. 2 They are both formed by cracking alkanes. 3 They both react with steam to form alcohols. 4 They have different general formulae. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Accepted Answer

C

Question 27

27 The flow chart shows some chemical substances and processes. glucose solution and yeast carbon fermentation dioxide compound X process Y water Which row identifies compound X and process Y? compound X process Y A ethanol combustion B ethanol cracking C ethene combustion D ethene cracking

Accepted Answer

A

Question 28

28 An object falls freely in a vacuum. Which speed–time graph represents the motion of the object? A B speed speed 0 0 0 time 0 time C D speed speed 0 0 0 time 0 time

Accepted Answer

D

Question 29

29 An irregularly shaped object is lowered into a measuring cylinder of water. 75 cm3 50 cm3 water water irregularly shaped object As the object is lowered into the water, the water level rises from 50 cm3 to 75 cm3. The object has a mass of 50 g. What is the density of the object? A 0.50 g / cm3 B 0.67 g / cm3 C 1.5 g / cm3 D 2.0 g / cm3

Accepted Answer

D

Question 30

30 Which source of energy is non-renewable? A hydroelectric B nuclear fission C tides D waves

Accepted Answer

B

Question 31

31 The diagram shows an object made partly of wood and partly of iron. Thermal energy is supplied in the position shown. Point P is marked at the bottom of the object. thermal energy wood iron P How does most thermal energy reach point P? A by conduction through the iron B by conduction through the wood C by convection through the iron D by convection through the wood

Accepted Answer

A

Question 32

32 Light undergoes total internal reflection in an optical fibre. Which statement explains why this reflection occurs? A The angle of incidence is equal to the angle of refraction. B The angle of incidence is greater than the angle of reflection. C The angle of incidence is greater than the critical angle. D The angle of incidence is less than the critical angle.

Accepted Answer

C

Question 33

33 Which statement about sound waves is not correct? A They are caused by vibrations. B They are longitudinal. C They transfer energy. D They travel in a vacuum.

Accepted Answer

D

Question 34

34 A circuit contains a battery, a fixed resistor, an ammeter and a variable resistor. The reading on the ammeter is 1.8 mA. A How much charge flows through the variable resistor in 30 s? A 0.054 C B 17 C C 54 C D 17 000 C

Accepted Answer

A

Question 35

35 A copper wire has a resistance of 8.0 . Four of these wires are arranged side by side to form a cable, as shown. What is the resistance of this cable? A 0.50  B 2.0  C 32  D 128 

Accepted Answer

B

Question 36

36 The diagram shows a circuit containing a resistor and an NTC thermistor. V The temperature of the thermistor increases. What happens to the resistance of the thermistor and what happens to the reading on the voltmeter? resistance of reading on thermistor voltmeter A decreases decreases B decreases increases C increases decreases D increases increases

Accepted Answer

A

Question 37

37 An electrical extension block has four sockets, a cable which can safely take a current of 6 A and a plug. It is protected by a fuse rated at 5 A. The extension block is used with four appliances and the 5 A fuse blows. The owner replaces the 5 A fuse with a 13 A fuse. Why is the extension block now dangerous? A The appliances may not receive enough current. B The cable may overheat before the fuse blows. C The sockets may burn out before the fuse blows. D The 13 A fuse may blow too soon.

Accepted Answer

B

Question 38

38 The diagram shows a wire in a magnetic field. There is a current in the wire in the direction shown. The direction of the magnetic field is also shown. wire current magnetic field The magnetic field causes a force on the wire. In which direction does this force act? A into the page B out of the page C towards the bottom of the page D towards the top of the page

Accepted Answer

A

Question 39

39 How do the ionising effect and the penetrating ability of alpha-emissions compare with those of beta-emissions? ionising effect penetrating ability A alpha more ionising than beta alpha more penetrating than beta B alpha more ionising than beta alpha less penetrating than beta C alpha less ionising than beta alpha more penetrating than beta D alpha less ionising than beta alpha less penetrating than beta

Accepted Answer

B

Question 40

40 A radioactive isotope has a half-life of 18 years. A sample contains 80 million atoms of this isotope. How long does it take for the number of atoms of this isotope in the sample to decrease to 10 million? A 2.25 years B 6.0 years C 54 years D 180 years

Accepted Answer

C

Question paper20 pages

Mark scheme3 pages

Questions as text

Q1 · Plant nutrition needs light and water

Q2 · The diagram shows a cell starting to plasmolyse

Q3 · Which chemical element is found in all proteins, but not in all carbohydrates or fats?

Q4 · The Pompeii worm lives in deep-sea hydrothermal vents where average temperatures are…

Q5 · A plant has leaves which have white parts and green parts

Question 6

Q7 · The diagram shows a plant shoot that is ringed

Q8 · The diagram shows the main structures in the breathing system of humans

Q9 · The diagram shows a section through the skin

Q10 · Which statements correctly describe the human male gamete?

Q11 · The table gives statements about a human haploid nucleus

Q12 · What is the main factor which determines the number of trophic levels in food chains?

Q13 · Which row shows an effect of a human activity on the environment?

Q14 · Substance P is separated into different parts using simple physical techniques

Q15 · Hydrogen chloride is a gas

Q16 · Aluminium is extracted from aluminium oxide by electrolysis

Q17 · Which statements about the reduction of copper(II) oxide by heating with carbon are…

Q18 · Copper carbonate is insoluble in water

Q19 · Which test and its result identifies aqueous bromide ions?

Q20 · Which row about the trends in the elements going down Group I of the Periodic Table is…

Q21 · An airship containing an unreactive gas floats in air, as shown

Q22 · Duralumin and magnalium are alloys used in the manufacture of aircraft

Q23 · Iron is extracted in the blast furnace

Q24 · Which statements about the reactions in a catalytic converter are correct?

Q25 · Which substances neutralise acids?

Q26 · Which statements about ethene and but-1-ene are correct?

Q27 · The flow chart shows some chemical substances and processes

Q28 · An object falls freely in a vacuum

Q29 · An irregularly shaped object is lowered into a measuring cylinder of water

Q30 · Which source of energy is non-renewable?

Q31 · The diagram shows an object made partly of wood and partly of iron

Q32 · Light undergoes total internal reflection in an optical fibre

Q33 · Which statement about sound waves is not correct?

Q34 · A circuit contains a battery, a fixed resistor, an ammeter and a variable resistor

Q35 · A copper wire has a resistance of 8.0 

Q36 · The diagram shows a circuit containing a resistor and an NTC thermistor

Q37 · An electrical extension block has four sockets, a cable which can safely take a current…

Q38 · The diagram shows a wire in a magnetic field

Q39 · How do the ionising effect and the penetrating ability of alpha-emissions compare with…

Q40 · A radioactive isotope has a half-life of 18 years

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