IGCSE Sciences - Co-Ordinated (0654) — May–June 2023, Paper 23
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →1 Which term is used to describe the removal of toxic materials from living organisms? A excretion B nutrition C respiration D secretion
Answer this question and get it marked →2 The diagrams show four different cells found in living organisms. 1 2 3 4 Which cell types have a large surface area for diffusion? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4
Answer this question and get it marked →3 Eggs contain fat, protein and water. Which results are obtained from doing food tests on an egg? ethanol Benedict’s test biuret test iodine test emulsion test A blue purple…
Answer this question and get it marked →4 During an enzyme-controlled reaction, the temperature is gradually lowered from the enzyme’s optimum temperature of 20 C to 5 C. Which changes occur as the temperature is…
Answer this question and get it marked →5 The diagram shows some of the uses in a plant of the initial carbohydrate made by photosynthesis. initial carbohydrate made in photosynthesis many of the addition of X same…
Answer this question and get it marked →6 A person is unwell with the following symptoms. ● swollen abdomen (belly) ● red patches on their skin ● loss of muscle mass What is the likely condition that this person has? A…
Answer this question and get it marked →7 Which cells lose water by evaporation from their surfaces during transpiration? A epidermis cells B guard cells C mesophyll cells D root hair cells 4
Answer this question and get it marked →8 Endothermic reactions use up more energy than they release while exothermic reactions release energy overall. Which row describes the type of reaction that occurs in the process…
Answer this question and get it marked →9 Which type of chemical is adrenaline? A enzyme B hormone C mineral salt D vitamin
Answer this question and get it marked →10 The diagram shows a section through an insect-pollinated flower. When pollination occurs, where must the pollen grains reach? A B C D 5
Answer this question and get it marked →11 A student writes down the statement shown. ‘Selective breeding by natural selection is carried out over many generations to improve crop plants and domesticated animals.’ The…
Answer this question and get it marked →12 The diagram shows a marine food web around a kelp (seaweed) forest. killer whale seal sea otter large fish sea urchin crab small fish kelp Which organisms are secondary…
Answer this question and get it marked →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 6
Answer this question and get it marked →14 A mixture of solid sulfur and solid sodium chloride is added to water and stirred. Sulfur is insoluble in water. Sodium chloride is soluble in water. Which processes are used…
Answer this question and get it marked →15 An atom of indium has the atomic number 49 and the nucleon number 115. Which row shows the numbers of protons, neutrons and electrons in this atom? number of number of number…
Answer this question and get it marked →16 Pentane, C5H12, burns in a limited air supply to produce some carbon dioxide and some carbon monoxide. What is a balanced equation for this reaction? A C5H12 + 7O2 3CO2 + 2CO…
Answer this question and get it marked →17 Copper is refined by electrolysis. Which statements about this process are correct? 1 Aqueous copper(II) sulfate is the electrolyte. 2 Inert anodes are used. 3 Cu2+ ions are…
Answer this question and get it marked →18 Which statement about chemical reactions is correct? A Endothermic reactions result in a temperature decrease. B Endothermic reactions result in a temperature increase. C…
Answer this question and get it marked →19 Which row describes the effect of increasing temperature on the collisions between particles in a chemical reaction? frequency of energy of collisions collisions A decreases…
Answer this question and get it marked →20 Crystals of copper(II) sulfate, a soluble salt, are made by reacting excess copper(II) oxide with dilute sulfuric acid. After filtering off the unreacted copper(II) oxide, the…
Answer this question and get it marked →21 The first row of the transition elements is shown. Sc Ti V Cr Mn Fe Co Ni Cu Zn Which statement about transition elements is not correct? A They are often used as catalysts. B…
Answer this question and get it marked →22 Which equation represents a reaction that takes place in the catalytic converter of a car? A N2 + 2O2 2NO2 B 2NO N2 + O2 C N2 + 3H2 2NH3 D 2SO2 + O2 2SO3
Answer this question and get it marked →23 The Haber process is used to make ammonia. Which statement about the Haber process is not correct? A A vanadium(V) oxide catalyst is used. B The nitrogen used is obtained from…
Answer this question and get it marked →24 Four different reactions occur in the manufacture of sulfuric acid by the Contact process. Which substance is a reactant in one of these reactions and a product in another? A…
Answer this question and get it marked →25 When limestone is heated, it decomposes. Which row about limestone and the decomposition is correct? chemical name for limestone decomposition products A calcium carbonate…
Answer this question and get it marked →26 Which fraction obtained from petroleum is used as a feedstock for making chemicals? A bitumen B gasoline C naphtha D refinery gas
Answer this question and get it marked →27 What is the structure of the addition polymer formed from but-2-ene? A B H H H H CH3 H C C C C C C H H H H n CH3 H n C D H H CH3 H C C C C H CH2CH3 n H CH3 n 10
Answer this question and get it marked →28 The speed–time graph represents the journey of a bicycle. 0.8 speed km / minute 0.6 0.4 0.2 0.0 0 1 2 3 4 time / minutes What is the total distance travelled by the bicycle? A…
Answer this question and get it marked →29 The diagram shows a cuboid box resting on the ground. The dimensions of the box are shown. 0.50 m 0.40 m 0.50 m The pressure on the ground due to the weight of the box is 50…
Answer this question and get it marked →30 Electricity can be generated in different types of power station. Which statement about geothermal power and nuclear power is correct? A Geothermal power and nuclear power are…
Answer this question and get it marked →31 What is the definition of efficiency? energy input A 100% useful energy output energy input B 100% wasted energy useful energy output C 100% energy input wasted energy D…
Answer this question and get it marked →32 The diagrams represent the arrangement of molecules in three states of matter. Arrows P and Q represent two changes of state. P Q Which row identifies the changes of state? P Q…
Answer this question and get it marked →33 A sound wave has a frequency of 16 kHz. The speed of sound is 320 m / s. What is the wavelength of the wave? A 0.020 m B 0.050 m C 20 m D 50 m 12
Answer this question and get it marked →34 Light passes from air through a solid glass block and back into the air. Which diagram shows the path of the light? A B glass glass block block C D glass glass block block
Answer this question and get it marked →35 The diagram shows an object at position P in front of a thin converging lens of focal length f. The lens produces a real image of the object. P Q f 2f The object is moved to…
Answer this question and get it marked →36 A student measures the current in a resistor and the potential difference (p.d.) across it. Which circuit shows an ammeter and a voltmeter both connected correctly? A B C D V A…
Answer this question and get it marked →37 A 3.0 resistor is connected to a 12 V power supply. 12 V 3.0 Ω How much electrical energy does the resistor transfer in 10 s? A 3.6 J B 4.8 J C 360 J D 480 J 14
Answer this question and get it marked →38 A solenoid carrying a current produces a magnetic field. Which diagram shows the magnetic field pattern? A B magnetic magnetic field field current current C D magnetic field…
Answer this question and get it marked →39 The diagram shows a motor. One part of the motor is labelled X. N S brush contact X What is the name of part X and how does it help the motor to work? how X helps the name of…
Answer this question and get it marked →40 A radioactive source emits -particles and -particles that pass into the space between two charged plates. – – – – – – – – α-particles and β-particles from radioactive source…
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