Cambridge IGCSE Sciences - Co-ordinated (Double) 0654 — 2018 Oct/Nov Paper 2 · Variant 2
0654/22/O/N/18 · 40 questions · 40 marks · ≈45 min
The question paper and its mark scheme, free to read here and free to download. This is Cambridge’s own paper, exactly as it was sat.
Question paper16 pages
Mark scheme3 pages
Answers below. Sit the paper first if you are practising.
Questions as text
Q1 · What are the optimum conditions of pH and temperature for the action of protease in the…
1 What are the optimum conditions of pH and temperature for the action of protease in the stomach? temperature pH / °C A 2 27 B 2 37 C 7 27 D 7 37
Mark scheme: B
Q2 · What will cause plant leaves to turn yellow?
2 What will cause plant leaves to turn yellow? A a lack of magnesium in the soil B a lack of starch in the leaves C a reduction in the rate of photosynthesis D a reduction in the rate of respiration
Mark scheme: A
Q3 · The diagram shows part of the digestive system
3 The diagram shows part of the digestive system. P Q R S Which of the labelled parts produce digestive enzymes, absorb water and store bile? produce digestive absorb water store bile enzymes A P Q R B Q R P C R S P D S P R
Mark scheme: C
Q4 · Plant cells are placed in a solution with a water potential higher than the cells
4 Plant cells are placed in a solution with a water potential higher than the cells. Which row is correct? movement of water volume of vacuole A enters cells decreases B enters cells increases C leaves cells decreases D leaves cells increases
Mark scheme: B
Q5 · Water is taken in through the roots and lost from the leaves of tall trees
5 Water is taken in through the roots and lost from the leaves of tall trees. What enables this to happen? A active transport by the xylem vessels B pressure from the roots C translocation in the phloem D transpiration loss from the leaves
Mark scheme: D
Q6 · What is meant by respiration?
6 What is meant by respiration? A breakdown of protein B sweating to lose heat C the function of lungs D the release of energy
Mark scheme: D
Q7 · What is the equation for aerobic respiration?
7 What is the equation for aerobic respiration? A 6CO2 + 6H2O → C6H12O6 + 6O2 B 6CO2 + C6H12O6 → 6O2 + 6H2O C 6O2 + 6H2O → C6H12O6 + 6CO2 D 6O2 + C6H12O6 → 6CO2 + 6H2O
Mark scheme: D
Q8 · To which environmental stimulus is a plant root responding when it grows downwards?
8 To which environmental stimulus is a plant root responding when it grows downwards? A a decrease in soil water content B light falling on the leaves of the plant C rising temperature D the force of gravity
Mark scheme: D
Q9 · What is an advantage of asexual reproduction compared with sexual reproduction?
9 What is an advantage of asexual reproduction compared with sexual reproduction? A A specific disease is less likely to spread throughout the whole population. B It increases variation in the offspring. C It produces offspring more rapidly. D It requires two parents.
Mark scheme: C
Q10 · The diagram shows part of a flower
10 The diagram shows part of a flower. P What is structure P and what type of pollination is used by the flower? structure P type of pollination A stamen insect-pollination B stamen wind-pollination C stigma insect-pollination D stigma wind-pollination
Mark scheme: D
Q11 · A man breeds small mammals in which the fur colour is black or white
11 A man breeds small mammals in which the fur colour is black or white. The allele for white is dominant to black. If he chooses a pair of heterozygous white mammals to breed together, which proportion of the offspring mammals will be black? A none of them B about a quarter C about half D all of them
Mark scheme: B
Q12 · The diagram shows part of the carbon cycle
12 The diagram shows part of the carbon cycle. Which arrow represents plant respiration? carbon compounds A in the air B carbon compounds carbon compounds in plants C in rocks, sea and soil D carbon compounds in animals
Mark scheme: B
Q13 · Which gas does not contribute to acid rain?
13 Which gas does not contribute to acid rain? A carbon dioxide B methane C oxides of nitrogen D sulfur dioxide
Mark scheme: B
Q14 · W, X, Y and Z are diagrams representing atoms and molecules
14 W, X, Y and Z are diagrams representing atoms and molecules. W X Y Z Which statement is correct? A W and Z are molecules and X and Y are atoms. B W, X and Z are molecules and Y is an atom. C W, Y and Z are molecules and X is an atom. D X, Y and Z are molecules and W is an atom.
Mark scheme: B
Q15 · Hexane and octane are liquid hydrocarbons that mix together
15 Hexane and octane are liquid hydrocarbons that mix together. Which apparatus is used to separate a mixture of these two liquids? A B C D xxxxxxxxx heat xxxxxxxxx heat
Mark scheme: D
Q16 · Compounds are made up from two or more different elements ««1«« bonded together
16 Compounds are made up from two or more different elements ««1«« bonded together. Compounds cannot be broken down into simpler substances by ««2«« processes. Compounds and their elements have ««3«« properties. Which words complete gaps 1, 2 and 3? 1 2 3 A chemically chemical similar B chemically physical different C physically chemical similar D physically physical different
Mark scheme: B
Q17 · Cryolite is a mineral which contains aluminium, sodium and fluorine
17 Cryolite is a mineral which contains aluminium, sodium and fluorine. It contains twice as many fluorine atoms as sodium atoms. It contains three times as many sodium atoms as aluminium atoms. What is the formula of cryolite? A NaAl 3F6 B Na2Al F4 C Na3Al F6 D Na3Al F4
Mark scheme: C
Q18 · The equation for the decomposition of copper carbonate is CuCO3(s) → CuO(s) + CO2(g)…
18 The equation for the decomposition of copper carbonate is CuCO3(s) → CuO(s) + CO2(g) Which volume of carbon dioxide is produced when 0.10 mol of copper carbonate is decomposed? A 0.24 dm3 B 2.4 dm3 C 24 dm3 D 240 dm3
Mark scheme: B
Q19 · Which diagram shows equipment used to electroplate nickel with copper?
19 Which diagram shows equipment used to electroplate nickel with copper? A B power supply power supply + – + – nickel copper nickel copper molten aqueous copper chloride copper chloride C D power supply power supply + – + – copper nickel copper nickel molten aqueous copper chloride copper chloride
Mark scheme: D
Q20 · Lime is manufactured from calcium carbonate
20 Lime is manufactured from calcium carbonate. Which type of reaction is involved in this process? A endothermic B neutralisation C precipitation D reduction
Mark scheme: A
Q21 · Which row describes what happens to an aluminium atom when it forms an aluminium ion, and…
21 Which row describes what happens to an aluminium atom when it forms an aluminium ion, and what is this process known as? aluminium atom process A gains three electrons oxidation B gains three electrons reduction C loses three electrons oxidation D loses three electrons reduction
Mark scheme: C
Q22 · Which statement about fluorine and astatine is correct?
22 Which statement about fluorine and astatine is correct? A Fluorine is a solid and astatine is a gas at room temperature. B Fluorine is darker in colour than astatine. C Fluorine is more reactive than astatine. D The formula of fluorine is F2 and the formula of astatine is At.
Mark scheme: C
Q23 · Which reaction does not occur in the blast furnace?
23 Which reaction does not occur in the blast furnace? A C + CO2 → 2CO B CaCO3 → CaO + CO2 C CaO + SiO2 → CaSiO3 D 2Fe + 3CO2 → Fe2O3 + 3CO
Mark scheme: D
Q24 · The diagram shows gas P being passed through liquid X and over iron filings
24 The diagram shows gas P being passed through liquid X and over iron filings. gas P iron filings liquid X Which gas and liquid cause the iron to rust? gas P liquid X A nitrogen concentrated sulfuric acid (a drying agent) B nitrogen water C oxygen concentrated sulfuric acid (a drying agent) D oxygen water
Mark scheme: D
Q25 · Sulfuric acid is manufactured by the Contact process
25 Sulfuric acid is manufactured by the Contact process. Which conditions are used in this process? A 2 atmospheres pressure and a vanadium pentoxide catalyst B 2 atmospheres pressure and an iron catalyst C 200 atmospheres pressure and a vanadium pentoxide catalyst D 200 atmospheres pressure and an iron catalyst
Mark scheme: A
Q26 · Ethene reacts with steam to make ethanol in the presence of a catalyst
26 Ethene reacts with steam to make ethanol in the presence of a catalyst. Which type of reaction occurs? A addition B displacement C oxidation D polymerisation
Mark scheme: A
Q27 · Which statement about proteins is not correct?
27 Which statement about proteins is not correct? A They are formed by addition polymerisation. B They are macromolecules. C They can be hydrolysed by acids. D They consist of amino acids joined by amide linkages.
Mark scheme: A
Q28 · A model aircraft starts to move
28 A model aircraft starts to move. It takes 16 seconds to reach its take-off speed of 32 m / s. What is the average acceleration of the aircraft during this time? A 0.25 m / s2 B 0.50 m / s2 C 1.0 m / s2 D 2.0 m / s2
Mark scheme: D
Q29 · What is the unit of work and what is an equivalent combination of units?
29 What is the unit of work and what is an equivalent combination of units? equivalent unit combination A joule newton metre B joule newton / metre C newton joule metre D newton joule / metre
Mark scheme: A
Q30 · A ball is thrown vertically upwards at a speed of 4.0 m / s
30 A ball is thrown vertically upwards at a speed of 4.0 m / s. The acceleration of free fall g is 10 m / s2. Air resistance can be ignored. What is the maximum height the ball reaches? A 0.20 m B 0.40 m C 0.80 m D 40 m
Mark scheme: C
Q31 · An axle is slightly larger than the hole in a wheel made from the same metal
31 An axle is slightly larger than the hole in a wheel made from the same metal. wheel axle hole How could an engineer fit the wheel onto the axle? A cool the axle only B cool the axle and cool the wheel by the same temperature change C heat the axle only D heat the axle and heat the wheel by the same temperature change
Mark scheme: A
Q32 · There is a vacuum between the double walls of a vacuum flask
32 There is a vacuum between the double walls of a vacuum flask. Which types of heat transfer are reduced by the vacuum? A conduction, convection and radiation B conduction and convection only C conduction and radiation only D convection and radiation only
Mark scheme: B
Q33 · A radio transmitter emits radio waves with a frequency of 1.25 × 108 Hz
33 A radio transmitter emits radio waves with a frequency of 1.25 × 108 Hz. The most suitable aerial for this frequency is 4 1 of a wavelength long. The speed of radio waves is 3.0 × 108 m / s. What is the length of the most suitable aerial? A 0.10 m B 0.60 m C 2.4 m D 9.6 m
Mark scheme: B
Q34 · Which diagram shows how a real image is formed by a convex lens?
34 Which diagram shows how a real image is formed by a convex lens? A B C D
Mark scheme: A
Q35 · The speed of sound in air is 330 m / s
35 The speed of sound in air is 330 m / s. How do the speeds of sound in concrete and water compare with this speed? speed in concrete speed in water A greater greater B greater less C less greater D less less
Mark scheme: A
Q36 · An electromagnet has a metal core
36 An electromagnet has a metal core. Which metal is used and why? A iron because it becomes a permanent magnet B iron because it does not become a permanent magnet C steel because it becomes a permanent magnet D steel because it does not become a permanent magnet
Mark scheme: B
Q37 · A circuit contains a lamp and a fuse
37 A circuit contains a lamp and a fuse. There is a current of 2.0 A in the lamp and it operates normally. A fault develops in the lamp. The current in the circuit increases, and the fuse now blows. The diagrams show two circuits. diagram 1 diagram 2 Which is the circuit used and what is the effect of the fuse when it blows? circuit effect of fuse A diagram 1 reduces current to 0 B diagram 1 reduces current to 2.0 A C diagram 2 reduces current to 0 D diagram 2 reduces current to 2.0 A
Mark scheme: C
Q38 · A 6.0 V battery is connected to three 10 Ω resistors, as shown
38 A 6.0 V battery is connected to three 10 Ω resistors, as shown. One resistor is labelled R. 6.0 V 10 Ω 10 Ω 10 Ω R What is the current in resistor R? A 0.20 A B 0.40 A C 0.60 A D 1.8 A
Mark scheme: B
Q39 · A current-carrying conductor is in a magnetic field
39 A current-carrying conductor is in a magnetic field. The current is switched on and a force acts on the conductor. The current is doubled and the magnetic field is reversed. How does the force on the conductor change, if at all? A The force is greater and in the opposite direction. B The force is greater and in the same direction. C The force is the same and in the same direction. D The force is the same but in the opposite direction.
Mark scheme: A
Q40 · The diagram shows a beam of β-particles and a beam of γ-rays entering the electric field…
40 The diagram shows a beam of β-particles and a beam of γ-rays entering the electric field between two charged plates. + + + + + + + + + + + + β-particles γ-rays – – – – – – – – – – – – What is the effect of the electric field on each of the beams? β-particles γ-rays A deflected downwards deflected upwards B deflected upwards deflected downwards C deflected upwards no effect D no effect deflected downwards
Mark scheme: C
What was in this paper
The subtopics covered by these 40 questions, and how many questions each got. Open one in a new tab to see every Cambridge question on it.
2Motion2Respiration2Air quality and climate1Alkenes1Asexual reproduction1Carbon cycle1Coordination and response1Corrosion of metals1Digestive system1Electrical circuits1Electrical safety1Electrolysis1Electromagnetic effects1Energy, work and power1Enzymes1Exothermic and endothermic reactions1Extraction of metals1Formulas1General properties of waves1Group VII properties1Light1Monohybrid inheritance1Osmosis1Photosynthesis1Polymers1Radioactivity1Rate of reaction1Redox1Separation and purification1Sexual reproduction in plants1Simple phenomena of magnetism1Sound1The mole and the Avogadro constant1Thermal properties and temperature1Transfer of thermal energy1Transpiration1What you needed in this session
Cambridge’s own grade thresholds for 2018 Oct/Nov, Paper 2 · Variant 2. A higher threshold means an easier paper — the bar moves with how the cohort did.