Cambridge IGCSE Sciences - Co-ordinated (Double) 0654 — 2019 May/June Paper 2 · Variant 1
0654/21/M/J/19 · 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 · Which characteristic of living organisms is correctly matched to the description?
1 Which characteristic of living organisms is correctly matched to the description? characteristic description A excretion the removal from organisms of the waste products of metabolism B nutrition the chemical reactions in cells that break down nutrient molecules and release energy for metabolism C respiration the taking in of materials for energy, growth and development D sensitivity the action by an organism or part of an organism causing a change of position or place
Mark scheme: A
Q2 · Which row correctly describes the diffusion of molecules from P to Q?
2 Which row correctly describes the diffusion of molecules from P to Q? P Q movement A higher concentration lower concentration down a concentration gradient B higher concentration lower concentration up a concentration gradient C lower concentration higher concentration down a concentration gradient D lower concentration higher concentration up a concentration gradient
Mark scheme: A
Q3 · Which chemical element is found in proteins, but not in carbohydrates or fats?
3 Which chemical element is found in proteins, but not in carbohydrates or fats? A carbon B hydrogen C oxygen D nitrogen
Mark scheme: D
Q4 · An investigation was carried out to see the effect of temperature on how quickly the…
4 An investigation was carried out to see the effect of temperature on how quickly the enzyme amylase breaks down starch to sugar. y-axis Z 0 x-axis Which labels should be used for the axes and what has happened at point Z? what has happened x-axis y-axis at Z A rate of breakdown temperature enzyme is denatured of starch B temperature time taken to enzyme is used up break down starch C temperature rate of break down enzyme is denatured of starch D time taken to temperature enzyme is used up break down starch
Mark scheme: C
Q5 · A farmer noticed that the older leaves of his maize plant were becoming yellow between…
5 A farmer noticed that the older leaves of his maize plant were becoming yellow between the veins. What is the plant lacking? A carbon dioxide B magnesium ions C sunlight D water
Mark scheme: B
Q6 · Which disease is caused by a diet that is low in protein?
6 Which disease is caused by a diet that is low in protein? A coronary heart disease B kwashiorkor C rickets D scurvy
Mark scheme: B
Q7 · Which component is needed for blood to clot?
7 Which component is needed for blood to clot? A hormones B platelets C red blood cells D white blood cells
Mark scheme: B
Q8 · During vigorous exercise there is an increase in the rate of breathing
8 During vigorous exercise there is an increase in the rate of breathing. What causes the increase in the rate of breathing? A a decrease in the adrenaline concentration in the blood B a decrease in the lactic acid concentration in the blood C an increase in the alcohol concentration in the blood D an increase in the carbon dioxide concentration in the blood
Mark scheme: D
Q9 · What occurs when our eyes look from a near object in dim light to a distant object in…
9 What occurs when our eyes look from a near object in dim light to a distant object in bright light? A Pupils constrict and lenses become thinner. B Pupils constrict and lenses become fatter. C Pupils dilate and lenses become thinner. D Pupils dilate and lenses become fatter.
Mark scheme: A
Q10 · The diagram shows a section through an insect-pollinated flower
10 The diagram shows a section through an insect-pollinated flower. When pollination occurs, where must the pollen grains reach? A B C D
Mark scheme: B
Q11 · Which row about human cells is correct?
11 Which row about human cells is correct? number of name of cell type of nucleus chromosomes A body cell diploid 23 B body cell haploid 46 C gamete diploid 46 D gamete haploid 23
Mark scheme: D
Q12 · In a food chain, what do all living organisms get from their food?
12 In a food chain, what do all living organisms get from their food? A a supply of water B oxygen for respiration C protection from disease D the energy they need
Mark scheme: D
Q13 · What decreases as a result of eutrophication?
13 What decreases as a result of eutrophication? A aerobic respiration by decomposers B decomposition of dead producers C dissolved oxygen in the water D growth of producers
Mark scheme: C
Q14 · Two substances, X and Y, are heated and then cooled
14 Two substances, X and Y, are heated and then cooled. The observations are shown. blue heat white cool white substance X solid solid solid grey heat purple cool grey substance Y solid vapour solid Which type of change occurs when X and Y are heated? X Y A chemical chemical B chemical physical C physical chemical D physical physical
Mark scheme: B
Q15 · Why do isotopes of the same element have the same chemical properties?
15 Why do isotopes of the same element have the same chemical properties? A They have a different number of protons and a different number of outer shell electrons. B They have a different number of protons and the same number of outer shell electrons. C They have the same number of protons and a different number of outer shell electrons. D They have the same number of protons and the same number of outer shell electrons.
Mark scheme: D
Q16 · Diamond and graphite are different forms of the element carbon
16 Diamond and graphite are different forms of the element carbon. Graphite conducts electricity. Which statement explains why diamond does not conduct electricity? A All of the atoms in diamond are arranged tetrahedrally. B All of the bond lengths in diamond are the same. C All of the bonds in diamond are single bonds. D All of the outer shell electrons in diamond are held in covalent bonds.
Mark scheme: D
Q17 · What is the electrolyte that is used when a nickel spoon is electroplated with copper?
17 What is the electrolyte that is used when a nickel spoon is electroplated with copper? A copper B copper sulfate solution C nickel sulfate solution D nickel
Mark scheme: B
Q18 · An acid is added to an alkali until the final solution is just neutral
18 An acid is added to an alkali until the final solution is just neutral. The reaction is exothermic. Which graph shows how the temperature changes as the acid is being added to the alkali? A B start start temperature temperature 0 volume of acid 0 volume of acid C D start start temperature temperature 0 volume of acid 0 volume of acid
Mark scheme: C
Q19 · Some properties of four oxides, W, X, Y and Z, are shown
19 Some properties of four oxides, W, X, Y and Z, are shown. property W X Y Z reaction with acids yes no no yes reaction with alkalis no yes no yes Which row classifies these oxides? W X Y Z A acidic basic neutral amphoteric B acidic basic amphoteric neutral C basic acidic amphoteric neutral D basic acidic neutral amphoteric
Mark scheme: D
Q20 · Hydrochloric acid and sodium hydroxide neutralise each other to form water and sodium…
20 Hydrochloric acid and sodium hydroxide neutralise each other to form water and sodium chloride. Which method is used to make the solution crystallise? A chromatography B evaporation C filtration D fractional distillation
Mark scheme: B
Q21 · Which statement about elements in the Periodic Table is correct?
21 Which statement about elements in the Periodic Table is correct? A Elements are arranged in mass number order. B The group number of an element is the same as the number of outer shell electrons. C The reactivity of elements in both Group I and Group VII increases down the group. D There is a change from non-metallic to metallic character from left to right across each period.
Mark scheme: B
Q22 · Samples of four different metals, L, M, N and O, are added to solutions of the metal…
22 Samples of four different metals, L, M, N and O, are added to solutions of the metal chlorides. The table shows which metals react with the metal chlorides. L chloride | Mchloride | Nchloride | Ochloride L x x x M J x J N J J J O J x x What is the order of reactivity? most least reactive reactive A L M O N B L O M N Cc N M O L D N O M L key JY = reaction X = no reaction
Mark scheme: C
Q23 · Some properties of aluminium are listed
23 Some properties of aluminium are listed. 1 conducts electricity 2 malleable 3 resistant to corrosion Which properties make aluminium suitable for use as food containers? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only
Mark scheme: D
Q24 · Which processes lead to the formation of a greenhouse gas?
24 Which processes lead to the formation of a greenhouse gas? 1 reaction of sodium with water 2 respiration 3 combustion of fossil fuels A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3
Mark scheme: C
Q25 · Sulfuric acid is manufactured by the Contact process
25 Sulfuric acid is manufactured by the Contact process. Four reactions occur in this process. Which reaction requires a catalyst? A S + O2 → SO2 B 2SO2 + O2 → 2SO3 C H2SO4 + SO3 → H2S2O7 D H2S2O7 + H2O → 2H2SO4
Mark scheme: B
Q26 · Three reactions are listed
26 Three reactions are listed. 1 the addition of hydrogen to ethene 2 the addition of steam to ethene 3 the cracking of long chain alkanes Which reactions produce molecules of a different homologous series from the reactant molecules? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3
Mark scheme: D
Q27 · Which diagram represents part of the structure of nylon?
27 Which diagram represents part of the structure of nylon? A B O O O O C N N C C CH CH C H H H H C D H H H H H H H H H H H H C C C C C C C C C C C C C C C C H H H H H H H H H H H H
Mark scheme: A
Q28 · A spring that obeys Hooke’s law has an unstretched length of 5.0 cm
28 A spring that obeys Hooke’s law has an unstretched length of 5.0 cm. A load of weight 0.50 N is hung from the spring and the length of the spring becomes 10.0 cm. The load is replaced with a new load and the length of the spring becomes 15.0 cm. The spring has not passed its limit of proportionality. What is the weight of the new load? A 0.50 N B 0.75 N C 1.0 N D 1.5 N
Mark scheme: C
Q29 · An object X with mass 2.0 kg is moving with a speed of 4.0 m / s
29 An object X with mass 2.0 kg is moving with a speed of 4.0 m / s. Which object has kinetic energy equal to that of object X? speed of object mass of object / kg m / s A 0.50 16 B 1.0 8.0 C 8.0 2.0 D 16 1.0
Mark scheme: C
Q30 · What are the units of work and power?
30 What are the units of work and power? work power A joule joule B joule watt C watt joule D watt watt
Mark scheme: B
Q31 · When evaporation occurs, molecules escape from the surface of a liquid
31 When evaporation occurs, molecules escape from the surface of a liquid. Which molecules escape, and what happens to the average speed of the molecules remaining in the liquid? average speed of escaping molecules remaining molecules A less energetic decreases B less energetic increases C more energetic decreases D more energetic increases
Mark scheme: C
Q32 · Two identical metal containers are painted
32 Two identical metal containers are painted. One is painted dull black and the other is painted shiny silver. They contain equal volumes of water and are placed outside on a sunny day. The temperature of the water in the black container increases more quickly than the temperature of the water in the silver container. Why does this happen? A The black container is the better absorber of radiation from the Sun. B The black container is the better conductor of heat. C The black container is the better emitter of radiation. D The black container is the better reflector of radiation from the Sun.
Mark scheme: A
Question 33
33 Diagram 1 represents a wave. displacement 00 time diagram 1 Which diagram represents a wave with twice the frequency and half the amplitude of the wave in diagram 1? The scales are the same in all the diagrams. A B displacement displacement 00 00 time time C D displacement displacement 00 00 time time
Mark scheme: B
Q34 · In the diagrams, F is one principal focus of the converging lens
34 In the diagrams, F is one principal focus of the converging lens. Which diagram shows the lens being used as a magnifying glass? A B F F C D F F
Mark scheme: A
Q35 · A sports field is next to a large school building
35 A sports field is next to a large school building. A student at the far side of the sports field sees a groundsman hit a pole with a hammer. school building student hammer pole about 400 m After the hammer hits the pole, the student hears two bangs. Why does the student hear two bangs? first bang caused by second bang caused by A sound of hammer hitting pole sound of pole hitting hammer B sound reaching the student’s left ear sound reaching the student’s right ear C sound reaching student directly sound reflected back from school building D sound reflected back from school building sound reaching student directly
Mark scheme: C
Q36 · In the circuit, component X is used to control the brightness of the lamp
36 In the circuit, component X is used to control the brightness of the lamp. lamp cell – + X What is component X? A an ammeter B a fixed resistor C a fuse D a variable resistor
Mark scheme: D
Q37 · There is a current of 3.0 A in a resistor
37 There is a current of 3.0 A in a resistor. The potential difference across the resistor is 3.0 V. How much electrical energy is transferred to other forms in 3.0 minutes? A 3.0 J B 9.0 J C 540 J D 1620 J
Mark scheme: D
Q38 · Which graph shows how the output voltage of an a.c
38 Which graph shows how the output voltage of an a.c. generator varies with time? A B voltage voltage 0 0 0 time 0 time C D voltage voltage 0 0 0 time 0 time
Mark scheme: A
Q39 · A transformer increases the voltage from a power station in order to transfer electricity…
39 A transformer increases the voltage from a power station in order to transfer electricity along the transmission cables. How does increasing the voltage affect the current in the cables and how does it affect the efficiency of energy transfer? current efficiency A decreases decreases B decreases increases C increases decreases D increases increases
Mark scheme: B
Q40 · There are three different isotopes of hydrogen
40 There are three different isotopes of hydrogen. 1 H H 2 H 3 1 1 1 Which statement about the nuclei of these three isotopes is correct? A They have different numbers of electrons. B They have the same number of nucleons. C They have the same number of neutrons. D They have the same number of protons.
Mark scheme: D
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.
2Energy, work and power2Air quality and climate1Alkenes1Arrangement of elements1Biological molecules1Blood1Cell division1Characteristics of living organisms1Conservation1Coordination and response1Diet1Diffusion1Electrical circuits1Electrical quantities1Electrolysis1Energy flow1Enzymes1Exothermic and endothermic reactions1Forces1Gas exchange in humans1General properties of waves1Giant covalent structures1Isotopes1Kinetic particle model of matter1Light1Oxides1Physical and chemical changes1Polymers1Preparation of salts1Properties of metals1Rate of reaction1Reactivity series1Sexual reproduction in plants1Sound1The nucleus1Transfer of thermal energy1Xylem and phloem1What you needed in this session
Cambridge’s own grade thresholds for 2019 May/June, Paper 2 · Variant 1. A higher threshold means an easier paper — the bar moves with how the cohort did.