Cambridge IGCSE Sciences - Co-ordinated (Double) 0654 — 2021 Feb/March Paper 1 · Variant 2
0654/12/F/M/21 · 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 row about characteristics of living things is correct?
1 Which row about characteristics of living things is correct? name of process definition of process A excretion the ability to detect and respond to changes in the environment B nutrition the removal of excess substances and toxic materials C respiration the breaking down of substances to release energy D reproduction the taking in of materials for energy, growth and development
Mark scheme: C
Q2 · The diagram shows an incomplete plant cell
2 The diagram shows an incomplete plant cell. Which structure is not shown? A cell membrane B cell wall C chloroplast D vacuole
Mark scheme: B
Q3 · What are the molecules that make up fats and oils?
3 What are the molecules that make up fats and oils? A amino acids and glycerol B fatty acids and glycerol C glucose and amino acids D glucose and fatty acids
Mark scheme: B
Q4 · What are biological catalysts?
4 What are biological catalysts? A antibodies B enzymes C hormones D platelets
Mark scheme: B
Q5 · The rate of photosynthesis was measured by counting the number of bubbles of oxygen…
5 The rate of photosynthesis was measured by counting the number of bubbles of oxygen produced by a submerged aquatic plant at different light intensities as shown. water aquatic plant Which two variables need to be kept constant? A size of plant used and temperature of the water B light intensity and size of the boiling tube C size of plant used and size of the boiling tube D temperature of the water and light intensity
Mark scheme: A
Q6 · The diagram shows human teeth in the lower jaw
6 The diagram shows human teeth in the lower jaw. X What type of tooth is X? A canine B incisor C molar D premolar
Mark scheme: D
Q7 · In which weather conditions is the rate of transpiration fastest?
7 In which weather conditions is the rate of transpiration fastest? A cold and dry B cold and wet C warm and dry D warm and wet
Mark scheme: C
Q8 · The graph shows the volume of air breathed in and out over a period of time
8 The graph shows the volume of air breathed in and out over a period of time. volume of air breathed in and out X time What happens after time X? breathing rate breathing volume A decreases decreases B decreases increases C increases decreases D increases increases
Mark scheme: D
Q9 · What is the effect of adrenaline on the body?
9 What is the effect of adrenaline on the body? pulse rate size of pupil A decreased large B decreased small C increased small D increased large
Mark scheme: D
Q10 · What is meant by fertilisation?
10 What is meant by fertilisation? A combining of male and female nuclei B joining of male and female sex organs C movement of sperms through the uterus to an ovum D reproduction
Mark scheme: A
Q11 · Which statement about human gametes is correct?
11 Which statement about human gametes is correct? A There is an X chromosome in all egg cells. B There is a Y chromosome in all egg cells. C There is an X chromosome in all sperm cells. D There is a Y chromosome in all sperm cells.
Mark scheme: A
Q12 · The diagram shows a food web
12 The diagram shows a food web. hawk spider snake kangaroo rat lizard plants How many consumers are in this food web? A 1 B 2 C 4 D 5
Mark scheme: D
Q13 · What could be a result of deforestation?
13 What could be a result of deforestation? A a decrease in flooding because there are less tree roots present B an increase in carbon dioxide because there are less tree leaves respiring C a decrease in soil erosion because there are less tree roots present D an increase in extinction because there are less habitats present
Mark scheme: D
Q14 · Which process is used to separate a mixture of coloured compounds?
14 Which process is used to separate a mixture of coloured compounds? A chromatography B distillation C evaporation D filtration
Mark scheme: A
Q15 · Copper hydroxide contains one copper atom, two hydrogen atoms and two oxygen atoms
15 Copper hydroxide contains one copper atom, two hydrogen atoms and two oxygen atoms. What is the correct formula of copper hydroxide? A CuH2O2 B CuO2H2 C Cu(OH)2 D H2O2Cu
Mark scheme: C
Q16 · An experiment is set up to test the effect of electricity on solution R
16 An experiment is set up to test the effect of electricity on solution R. + – Q P solution R What are the names of P, Q and R? P Q R A anode cathode electrode B anode cathode electrolyte C cathode anode electrode D cathode anode electrolyte
Mark scheme: D
Q17 · The diagram shows the energy change for the reactions between hydrogen and the halogens
17 The diagram shows the energy change for the reactions between hydrogen and the halogens. The reaction is H2 + X2 2HX. The size of the energy change is different for each halogen. H2 + X2 energy change energy 2HX progress of reaction The diagram shows that the reactions are ……1…… . The most reactive halogen is ……2…… and therefore the energy change for this element is ……3…… . Which words complete gaps 1, 2 and 3? 1 2 3 A endothermic fluorine least B endothermic iodine least C exothermic fluorine greatest D exothermic iodine greatest
Mark scheme: C
Q18 · In an experiment, a 2 g piece of calcium carbonate is added to 50 cm3 of dilute…
18 In an experiment, a 2 g piece of calcium carbonate is added to 50 cm3 of dilute hydrochloric acid at 21 C. The volume of gas produced is measured over time and is shown as solid line X on the graph. Which line is obtained when the experiment is repeated using 50 cm3 of the same acid at 35 C? A B volume of gas C X D 0 time
Mark scheme: B
Q19 · In which word equation is the underlined substance being oxidised?
19 In which word equation is the underlined substance being oxidised? A carbon dioxide + carbon carbon monoxide B carbon monoxide + iron oxide carbon dioxide + iron C copper oxide + magnesium magnesium oxide + copper D magnesium oxide + hydrochloric acid magnesium chloride + water
Mark scheme: B
Q20 · A label from a packet of indigestion tablets is shown
20 A label from a packet of indigestion tablets is shown. Each tablet contains: magnesium carbonate 120 mg magnesium hydroxide 15 mg magnesium oxide 62 mg magnesium sulfate 47 mg Which substance does not neutralise stomach acid? A magnesium carbonate B magnesium hydroxide C magnesium oxide D magnesium sulfate
Mark scheme: D
More questions on The characteristic properties of acids and bases
Q21 · Substance X is insoluble in water
21 Substance X is insoluble in water. It reacts with dilute nitric acid to produce solution Y and a gas which turns limewater milky. A white precipitate is formed when aqueous sodium hydroxide is added to solution Y. This precipitate remains when excess sodium hydroxide is added. What is substance X? A calcium carbonate B calcium chloride C zinc carbonate D zinc chloride
Mark scheme: A
Q22 · Which elements in the Periodic Table form coloured compounds?
22 Which elements in the Periodic Table form coloured compounds? A Group I metals B halogens C noble gases D transition metals
Mark scheme: D
Q23 · Which metal reacts most vigorously with dilute hydrochloric acid?
23 Which metal reacts most vigorously with dilute hydrochloric acid? A aluminium B copper C magnesium D zinc
Mark scheme: C
Q24 · Both anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are used as chemical…
24 Both anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are used as chemical tests for water. Which row describes the effect of water on the colour of anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate? anhydrous anhydrous cobalt(II) chloride copper(II) sulfate A blue to pink blue to white B blue to pink white to blue C pink to blue blue to white D pink to blue white to blue
Mark scheme: B
Q25 · Which row about carbon dioxide and methane is correct?
25 Which row about carbon dioxide and methane is correct? carbon dioxide methane v v x x v x v x key ¥ = greenhouse gas X = not a greenhouse gas
Mark scheme: A
Q26 · Naphtha is obtained from petroleum
26 Naphtha is obtained from petroleum. What is a use for naphtha? A cooking B making chemicals C heating D making roads
Mark scheme: B
Q27 · Which statements about ethanol are correct?
27 Which statements about ethanol are correct? 1 The combustion of ethanol is exothermic. 2 Ethanol is used as a solvent. 3 Ethanol is produced by fermentation. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only
Mark scheme: A
Q28 · The diagram shows a pendulum swinging backwards and forwards between points P and Q
28 The diagram shows a pendulum swinging backwards and forwards between points P and Q. P Q The pendulum takes 34 seconds to swing from P to Q and back to P again 20 times. What is the period of the pendulum? A 0.85 s B 1.7 s C 3.4 s D 34 s
Mark scheme: B
More questions on Physical quantities and measurement techniques
Q29 · Which property of a body cannot be changed by the application of a force?
29 Which property of a body cannot be changed by the application of a force? A mass B motion C shape D size
Mark scheme: A
Q30 · A scientist uses a lever to lift a heavy load
30 A scientist uses a lever to lift a heavy load. She applies a force of 120 N at a distance of 360 cm from a pivot. 360 cm load 120 N pivot What is the moment about the pivot of the force applied by the scientist? A 3.0 N m B 33.3 N m C 432 N m D 43 200 N m
Mark scheme: C
Q31 · A force acts on an object and moves it through a distance
31 A force acts on an object and moves it through a distance. Which force does the least amount of work? force / N distance / m A 1.0 1.0 B 1.0 10.0 C 10.0 1.0 D 10.0 10.0
Mark scheme: A
Q32 · A beaker of water at 60 C is placed in a freezer
32 A beaker of water at 60 C is placed in a freezer. The graph shows how the temperature of the water changes with time. In which labelled section of the graph are both water and ice present in the beaker? 60 temperature / °C A B 0 0 time C D
Mark scheme: B
Q33 · There is a vacuum in the space between the Sun and the Earth
33 There is a vacuum in the space between the Sun and the Earth. How is thermal energy transferred from the Sun to the Earth? A by conduction only B by convection only C by radiation only D by convection and radiation only
Mark scheme: C
Q34 · The diagram shows two rays of light that have passed from an object through a converging…
34 The diagram shows two rays of light that have passed from an object through a converging lens. object X rays of light lens Y Which labelled point X or Y is a principal focus of the lens, and how does the size of the image compare with the size of the object? principal focus size of image A X larger than object B X smaller than object C Y larger than object D Y smaller than object
Mark scheme: A
Q35 · Astronaut 1 uses a hammer to mend a satellite in space
35 Astronaut 1 uses a hammer to mend a satellite in space. Astronaut 2 is nearby. There is no air in space. hammer astronaut 1 astronaut 2 What does astronaut 2 hear compared with the sound heard if they were working on Earth? A a louder sound B a quieter sound C a sound of the same loudness D no sound at all
Mark scheme: D
Q36 · What is used to measure potential difference (p.d.)?
36 What is used to measure potential difference (p.d.)? A ammeter B newton meter C variable resistor D voltmeter
Mark scheme: D
Q37 · Which symbol represents a fuse?
37 Which symbol represents a fuse? A B C D
Mark scheme: B
Q38 · Which diagram shows the pattern of the magnetic field due to a current in a straight wire?
38 Which diagram shows the pattern of the magnetic field due to a current in a straight wire? A B current current C D current current
Mark scheme: A
Q39 · The table compares an atom of carbon-13 and an atom of nitrogen-14
39 The table compares an atom of carbon-13 and an atom of nitrogen-14. carbon-13 nitrogen-14 nucleon number A 13 14 proton number Z 6 7 What do the neutral atom of carbon-13 and the neutral atom of nitrogen-14 have the same number of? A electrons B ions C neutrons D protons
Mark scheme: C
Q40 · , and radiation can all penetrate materials and ionise atoms
40 , and radiation can all penetrate materials and ionise atoms. Which row compares the different types of radiation? least least penetrating ionising A B C D
Mark scheme: B
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.
2Identification of ions and gases2Air quality and climate1Alcohols1Biological molecules1Cell structure1Characteristics of living organisms1Chromatography1Chromosomes and genes1Digestive system1Electrical quantities1Electrical safety1Electrolysis1Energy, work and power1Enzymes1Exothermic and endothermic reactions1Food chains and food webs1Formulas1Fuels1Gas exchange in humans1Habitat destruction1Hormones1Light1Photosynthesis1Physical quantities and measurement techniques1Radioactivity1Rate of reaction1Reactivity series1Redox1Sexual reproduction in humans1Simple phenomena of magnetism1Sound1The characteristic properties of acids and bases1The nucleus1Thermal properties and temperature1Transfer of thermal energy1Transition elements1Transpiration1What you needed in this session
Cambridge’s own grade thresholds for 2021 Feb/March, Paper 1 · Variant 2. A higher threshold means an easier paper — the bar moves with how the cohort did.