IGCSE Sciences - Co-Ordinated (0654) — May–June 2023, Paper 21
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →1 What is meant by respiration? A protein synthesis B sweating to lose heat C the function of lungs D the release of energy
Answer this question and get it marked →2 What is meant by osmosis? A the net movement of water molecules from a region of higher water potential to a region of lower water potential through a cell wall B the net…
Answer this question and get it marked →3 Linoleic acid is a fatty acid. Which larger molecule may contain linoleic acid? A glycogen B oil C protein D starch
Answer this question and get it marked →4 Which row about enzymes is correct? each enzyme the active site is enzymes are enzymes are enzymes can catalyses many the part of the denatured at complex work outside different…
Answer this question and get it marked →5 An experiment is set up to investigate the effect of changing the light intensity on the rate of photosynthesis. The lamp is moved in 10 cm intervals away from the plant and the…
Answer this question and get it marked →6 Some processes that occur in the alimentary canal and associated organs are listed. 1 absorption 2 assimilation 3 digestion 4 egestion 5 ingestion Which diagram correctly links…
Answer this question and get it marked →7 What is the sequence of blood vessels that a red blood cell passes through as it travels from the vena cava to the kidney? A pulmonary artery pulmonary vein aorta renal…
Answer this question and get it marked →8 Which statement about anaerobic respiration is correct? A It does not cause an oxygen debt. B It occurs in the muscles during vigorous exercise. C It uses oxygen to release…
Answer this question and get it marked →9 What is the function of the cornea? A It carries impulses to the brain. B It controls how much light enters the pupil. C It focuses light onto the retina. D It refracts light.
Answer this question and get it marked →10 In a plant, what leads to offspring that are genetically identical to the parent? A asexual reproduction B insect pollination C seed germination D sexual reproduction 6
Answer this question and get it marked →11 The diagram shows eggs and sperm containing sex chromosomes. 1 2 3 4 egg XX X XY Y 5 6 7 8 sperm X Y XX XY Which row gives the correct combination of sex chromosomes for a male…
Answer this question and get it marked →12 The diagram shows a food web. kestrels wrens bank voles goldfinches aphids caterpillars grass hogweed ivy oak tree How many primary consumers, secondary consumers, tertiary…
Answer this question and get it marked →13 What causes eutrophication? A combustion of fossil fuels B cutting down of forests C discarded plastic rubbish D overuse of nitrogen-containing fertiliser
Answer this question and get it marked →14 An aqueous salt solution contains an insoluble impurity. Which processes are used to obtain pure salt crystals? A distillation then crystallisation B distillation then…
Answer this question and get it marked →15 The element phosphorus burns in air, as shown. 4P + 5O2 P4O10 What does the formula P4O10 show? A a mixture of atoms of two elements B a mixture of molecules of two elements…
Answer this question and get it marked →16 Which row describes an atom that has the nucleon number 24? number of number of number of protons neutrons electrons A 8 8 8 B 12 12 12 C 21 24 21 D 24 28 24 8
Answer this question and get it marked →17 Which symbol equation is not balanced? A C3H8 + 5O2 3CO2 + 4H2O B Fe3O4 + 2H2 3Fe + 2H2O C Mg(OH)2 + 2HCl MgCl 2 + 2H2O D 2Na + 2H2O 2NaOH + H2
Answer this question and get it marked →18 Sodium hydroxide is manufactured by the electrolysis of concentrated aqueous sodium chloride. During the process, a gas is given off at each electrode and the aqueous sodium…
Answer this question and get it marked →19 Which row explains why increasing the concentration of a reactant increases the rate of reaction? proportion of particles collision frequency with the minimum between reacting…
Answer this question and get it marked →20 Which statements about neutralisation are correct? 1 Acids and bases produce water when they neutralise each other. 2 During neutralisation, bases transfer protons to acids. 3…
Answer this question and get it marked →21 The properties of some substances are listed. 1 form acidic oxides 2 have high melting points 3 act as catalysts 4 form coloured compounds What are the properties of transition…
Answer this question and get it marked →22 Which atmospheric pollutant is removed from air by lime? A ammonia B carbon monoxide C hydrocarbons D sulfur dioxide
Answer this question and get it marked →23 Which row describes how hydrogen and nitrogen are obtained for use in the Haber process? hydrogen nitrogen A electrolysis of sulfuric acid catalytic reduction of nitrogen…
Answer this question and get it marked →24 Equations representing reactions in the Contact process are listed. reaction 1 S + O2 SO2 reaction 2 2SO2 + O2 2SO3 reaction 3 H2SO4 + SO3 H2S2O7 reaction 4 H2S2O7 + H2O …
Answer this question and get it marked →25 Which statements about limestone are correct? 1 Its main constituent is calcium oxide. 2 It can be used to manufacture lime. 3 It thermally decomposes to release carbon…
Answer this question and get it marked →26 Petroleum is separated into fractions by fractional distillation. Information about uses of some fractions and positions in the fractionating column where they are collected is…
Answer this question and get it marked →27 Which structure represents the addition polymer made from the monomer propene, C3H6? A B CH3 H CH3 H H H H H C C C C C C C C H H H H H H H H C D CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH3…
Answer this question and get it marked →28 The diagram shows the speed–time graph for a moving object. 20 speed m/s 10 0 0 2.0 4.0 time / s What is the distance travelled by the object in 4.0 s? A 30 m B 40 m C 50 m D…
Answer this question and get it marked →29 The diagram shows a triangular sheet of metal with sides of length 50 cm, 40 cm and 30 cm. The sheet is free to move about a pivot at the top corner, as shown. pivot 50 cm 40…
Answer this question and get it marked →30 cm A cord is attached to the bottom left corner of the sheet and pulled with a horizontal force of 5.0 N to the left. What is the moment of the 5.0 N force about the pivot? A…
Answer this question and get it marked →31 Which statement about thermal radiation is correct? A A dull surface is a good absorber and a good reflector of thermal radiation. B A dull surface is a poor absorber and a…
Answer this question and get it marked →32 A student stands in front of a plane mirror on a wall. Which statement about the image of the student is not correct? A The image is laterally inverted (left to right). B The…
Answer this question and get it marked →33 A wave has a frequency of 3.0 MHz and a speed of 1500 m / s. What is the wavelength of the wave? A 5.0 10–4 m B 0.50 m C 500 m D 4500 m
Answer this question and get it marked →34 The diagram shows a ray of light passing from air into plastic. The sizes of four angles are given. 30° 60° air plastic 72° 18° The table gives the value of the sine of each…
Answer this question and get it marked →35 Two insulators are charged by rubbing them with a cloth. After this, the charged insulators repel each other. Which statement is a possible description of how the insulators…
Answer this question and get it marked →36 A battery of e.m.f. V is connected across a resistor of resistance R. There is a current in the resistor. V R current Which row shows two changes that both increase the current…
Answer this question and get it marked →37 An electric kettle is connected to a 250 V supply. The current in the heating element of the kettle is 10 A. How much electrical energy is transferred in 3.0 minutes? A 75 J B…
Answer this question and get it marked →38 Fuses are used in domestic electric circuits. Which statement about fuses is correct? A A fuse is connected in the live wire. B A fuse is connected in the neutral wire. C A 3.0…
Answer this question and get it marked →39 A radioactive nucleus 238 92 U decays into a thorium (Th) nucleus by emitting an alpha-particle. What is the symbol for the thorium nucleus formed? 234 234 238 238 A 90 Th B 92…
Answer this question and get it marked →40 The diagrams show a beam of beta-particles passing into an electric field and another beam of beta-particles passing into a magnetic field. + + + + + beta-particles – – – – – N…
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