IGCSE Sciences - Co-Ordinated (0654) — October–November 2024, Paper 23
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Soya seeds contain a lot of protein and are often fed to farm animals. Which characteristic of living things will benefit from the soya seeds? A excretion B growth C movement D…
Answer this question and get it marked →Pieces of potato of the same length were placed in sucrose solutions of different concentrations. Their length was measured again after two hours. The graph plots change in length…
Answer this question and get it marked →Four different foods labelled A, B, C and D are tested to find out which nutrients they contain. Which food contains both starch and protein but no reducing sugar (final colour…
Answer this question and get it marked →When the phenol molecules in apples are exposed to air, they react with oxygen and the fruit turns brown. This is an enzyme-controlled reaction. The graph shows the effect of pH…
Answer this question and get it marked →What causes 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…
Answer this question and get it marked →Which component of a balanced diet is needed to prevent constipation? A carbohydrate B fat C protein D fibre
Answer this question and get it marked →The diagram shows the life cycle of a plant that takes two years to grow from a seed and produce new seeds. Which row about the large root in year 1 and in year 2 is correct (in…
Answer this question and get it marked →Which equation shows the metabolic process used in bread making? A carbon dioxide + water - glucose + oxygen B glucose + oxygen - carbon dioxide + water C glucose - ethanol +…
Answer this question and get it marked →What are examples of involuntary actions? 1 widening of the pupil in dim light; 2 increasing the pulse rate during exercise; 3 contracting muscles to pick up a pencil. A 1, 2 and…
Answer this question and get it marked →The diagram shows a flower with structures labelled P, Q and R. Which row names the structures labelled P, Q and R (P / Q / R)? A anther / ovary / sepal B anther / style / carpel…
Answer this question and get it marked →The boxes show the steps involved in artificial selection of an animal species: 1 identify offspring with desirable features; 2 mate a male and a female with desirable features; 3…
Answer this question and get it marked →Which statement about all food chains is correct? A All the carnivores are producers. B All the consumers are carnivores. C All the herbivores are consumers. D All the producers…
Answer this question and get it marked →The release of fertiliser into rivers and lakes causes eutrophication which can lead to the death of fish. What causes the fish to die? A Decreased photosynthesis by producers…
Answer this question and get it marked →The numbers of protons, neutrons and electrons in four particles are shown: W (protons 20, neutrons 20, electrons 20); X (19, 20, 19); Y (20, 22, 18); Z (21, 24, 21). Which two…
Answer this question and get it marked →A sample of methane has mass 16.0 g at r.t.p. and contains the Avogadro number of molecules. What is the volume of 4.0 g of methane at r.t.p.? A 4.0 dm^3 B 6.0 dm^3 C 16 dm^3 D 24…
Answer this question and get it marked →The diagram shows the electrolysis of molten lead(II) bromide using inert electrodes, with electrode X producing a grey solid and electrode Y producing coloured fumes. Which…
Answer this question and get it marked →Which energy level diagram shows the activation energy for an exothermic reaction (energy against progress of reaction, with reactants higher than products and an activation…
Answer this question and get it marked →The apparatus used to determine the rate of a chemical reaction is shown (a gas syringe collecting gas from a flask). For which reaction is the rate determined using this…
Answer this question and get it marked →The equation for the reaction between magnesium and zinc sulfate is: Mg + ZnSO4 - Zn + MgSO4. What happens to magnesium in this reaction? A It is oxidised because it gains…
Answer this question and get it marked →Cobalt(II) chloride, cobalt(II) nitrate, and cobalt(II) sulfate are soluble in water. Cobalt(II) oxide and cobalt(II) carbonate are insoluble in water. Which method can be used to…
Answer this question and get it marked →What is warmed with a salt to test for ammonium ions? A aqueous barium chloride B aqueous litmus C aqueous silver nitrate D aqueous sodium hydroxide
Answer this question and get it marked →Which statement about the halogens is not correct? A Bromine is darker in colour than iodine. B Iodine is solid at room temperature. C They all have seven electrons in their outer…
Answer this question and get it marked →Which statement describes a typical transition element? A It has a high melting point, high density and forms a coloured salt. B It has a high melting point, low density and forms…
Answer this question and get it marked →When iron is galvanised, it is coated with a layer of zinc. Which statements about galvanising are correct? 1 Zinc has a greater tendency to form positive ions than iron. 2 Zinc…
Answer this question and get it marked →Which three elements do most fertilisers contain? A Na, C, P B Na, P, K C K, C, N D K, P, N
Answer this question and get it marked →Which reaction that occurs in the Contact process requires the use of a vanadium(V) oxide catalyst? A S + O2 - SO2 B 2SO2 + O2 - 2SO3 C SO3 + H2SO4 - H2S2O7 D H2S2O7 + H2O - 2H2SO4
Answer this question and get it marked →Reactants for three chemical processes are listed: 1 ethene + steam; 2 ethene + hydrogen; 3 ethene forming poly(ethene). Which processes form saturated hydrocarbons? A 1, 2 and 3…
Answer this question and get it marked →The diagrams show four solid blocks of equal mass. Which block is made from the least dense material (dimensions: A 8.0 x 2.0 x 1.0 cm; B 3.0 x 3.0 x 2.0 cm; C 5.0 x 2.0 x 2.0 cm;…
Answer this question and get it marked →A person uses a bar that is 3.0 m long to lift a rock of weight 900 N off the ground. There is a pivot under the bar at 0.50 m from the rock. The person pushes vertically…
Answer this question and get it marked →Which energy resource does not have the Sun as its source of energy? A coal B geothermal C hydroelectric D water waves
Answer this question and get it marked →A sample of gas is sealed inside a container. The volume of the container is slowly decreased. The temperature of the gas remains constant. Which row describes and explains what…
Answer this question and get it marked →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…
Answer this question and get it marked →A light wave travelling in air is refracted as it enters a glass block. Which row shows the effect on the speed and the wavelength of the light wave as it enters the glass (speed…
Answer this question and get it marked →The diagram shows the formation of an image of an object by a converging lens, with points X, Y and Z labelled along the axis. Which labelled point is a principal focus of the…
Answer this question and get it marked →The current-voltage characteristic for a filament lamp is shown (a curve that flattens as voltage increases). As the current increases, what happens to the temperature of the lamp…
Answer this question and get it marked →A 12 ohm resistor is connected in parallel with a 6.0 ohm resistor. What is the combined resistance of the two resistors? A 0.25 ohms B 4.0 ohms C 9.0 ohms D 18 ohms
Answer this question and get it marked →An electric motor is connected to a power supply by insulated wires. The circuit is protected by a fuse, but the wires become hot. Which change prevents the wires from becoming so…
Answer this question and get it marked →Which diagram shows the pattern and the direction of the magnetic field around a straight wire carrying a current into the page (concentric circles, clockwise when viewed with the…
Answer this question and get it marked →What is the purpose of the slip rings in an alternating current (a.c.) generator? A to allow each end of the coil to contact each carbon brush alternately B to allow each end of…
Answer this question and get it marked →A radioactive source emits beta-particles and gamma-rays. Both types of radiation enter the magnetic field between the poles of a magnet (north pole at the top, south pole at the…
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