IGCSE Science - Combined (0653) — October–November 2024, Paper 21
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Which characteristics are found in all living organisms? The table uses "yes"/"no" for each of: excretion, growth, photosynthesis, respiration. excretion growth photosynthesis…
Answer this question and get it marked →What is the function of ciliated cells in the bronchi? A absorption of oxygen B movement of mucus C production of mucus D transport of oxygen
Answer this question and get it marked →A student uses a starch suspension contained in a transparent partially permeable membrane to investigate diffusion. The membrane is placed in a beaker of X. The diagram shows the…
Answer this question and get it marked →Which two components of cow's milk are essential for strong teeth and bones? A minerals and vitamins B fats and proteins C carbohydrates and vitamins D minerals and water
Answer this question and get it marked →The diagram shows the human alimentary canal with three regions labelled 1 (mouth/upper region), 2 (middle region) and 3 (lower region/anus). Where do egestion and ingestion…
Answer this question and get it marked →A list of enzymes and a diagram of some human organs are shown. The organ labelled X is shown in the diagram. 1 amylase 2 protease 3 lipase Which enzymes are secreted by the organ…
Answer this question and get it marked →Which row is correct for the transport of water during transpiration in plants? tissue direction of transport --- --- --- A phloem leaf to root B phloem root to leaf C xylem leaf…
Answer this question and get it marked →What happens after blood has filled the atria of the heart? muscles of the atria muscles of the ventricles valves between atria and ventricles --- --- --- --- A contract contract…
Answer this question and get it marked →Which row completes the balanced chemical equation for aerobic respiration? C6H12O6 + ...1... → ...2... + ...3... 1 2 3 --- --- --- --- A 6H2O 6O2 6CO2 B 6O2 6CO2 3H2O C 3O2 6CO2…
Answer this question and get it marked →The diagram shows a germinated seed in a horizontal position, with a shoot and a root growing from the seed. Four areas A, B, C and D are marked along the root. In which area is…
Answer this question and get it marked →Which row about wind-pollinated plants is correct? position of stamens and stigmas size of petals compared to insect-pollinated plants --- --- --- A outside the flower large B…
Answer this question and get it marked →The diagram represents the human placenta. The blood of the fetus is on one side and the blood of the mother on the other, separated by the placenta. P and Q show the net movement…
Answer this question and get it marked →Which factors reduce the possible number of trophic levels in a food chain? 1 energy lost in faeces 2 energy absorbed by a plant leaf 3 energy released by respiration 4 energy…
Answer this question and get it marked →The diagram shows a chromatogram produced by four different substances A, B, C and D. The vertical axis is marked in cm from 0 to 5, with the baseline at 0 and the solvent front…
Answer this question and get it marked →Which process is not a chemical change? A electrolysis of molten lead bromide B fractional distillation of petroleum C oxidation of copper D rusting of iron
Answer this question and get it marked →Magnesium chloride is an ionic compound. Which row describes the formation of magnesium chloride and the strength of the attraction between its ions? formation of magnesium…
Answer this question and get it marked →The equation for the reaction between barium nitrate and sodium sulfate is shown. Ba(NO3)2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaNO3(aq) What is the ionic equation for this reaction? A…
Answer this question and get it marked →When molten sodium chloride is electrolysed using inert electrodes, sodium and chlorine are produced at the electrodes. Which row describes what happens at the anode and at the…
Answer this question and get it marked →Which row about bond breaking is correct? type of process net energy transfer --- --- --- A endothermic to surroundings B endothermic from surroundings C exothermic to…
Answer this question and get it marked →Which statement explains how decreasing the concentration of reactants affects the rate of a reaction? A It decreases because the frequency of collisions decreases. B It decreases…
Answer this question and get it marked →Compound X reacts with compound Y to form sodium sulfate, water and carbon dioxide. What are X and Y? X Y --- --- --- A sodium carbonate hydrochloric acid B sodium carbonate…
Answer this question and get it marked →A piece of damp blue litmus paper is placed in a gas. The litmus paper turns red and then turns white. What is the gas? A chlorine B hydrogen C carbon dioxide D oxygen
Answer this question and get it marked →Which statement explains why the elements in Group VIII of the Periodic Table are unreactive? A They are gases. B They are non-metals. C They have equal numbers of protons and…
Answer this question and get it marked →Which metal can be obtained by passing hydrogen over its heated metal oxide? A copper B magnesium C iron D zinc
Answer this question and get it marked →Which pie chart shows the composition of clean air? The four pie charts A, B, C and D each show segments for nitrogen, oxygen, carbon dioxide and other gases in different…
Answer this question and get it marked →Which statements about the alkanes are correct? 1 They are saturated hydrocarbons. 2 They produce carbon monoxide and water during complete combustion. 3 They are generally…
Answer this question and get it marked →Which statement about cracking is correct? A Alkanes are produced, which are used to make polymers. B Low temperatures are used. C Alkenes are the only products. D A catalyst is…
Answer this question and get it marked →A car is moving downhill along a road at a constant speed. Which graph is the speed–time graph for the car? The four graphs A, B, C and D plot speed (y-axis) against time…
Answer this question and get it marked →A cube is made of material with a density of 5.0 g / cm³. Which row shows the length of one side and the mass of the cube? length of one side of cube / cm mass of cube / g --- ---…
Answer this question and get it marked →A block of weight 65 N rests on a horizontal surface. The pressure on the surface due to the block is 10 Pa. What is the area of contact between the block and the surface? A 6.5…
Answer this question and get it marked →A wind-powered generator is used to charge a car battery. In which form is energy stored in the moving air, and in which form is energy stored in the charged battery? energy in…
Answer this question and get it marked →For which energy resource is the Sun the main source of energy? A geothermal B nuclear C tidal D wind
Answer this question and get it marked →A gas changes state to become a liquid. How do the forces between the molecules and the distances between the molecules change? forces between molecules distances between…
Answer this question and get it marked →A small coloured crystal is at the bottom of a beaker of water at room temperature. The beaker is gently heated from underneath the crystal, and the crystal dissolves slowly.…
Answer this question and get it marked →A thin converging lens is used as a magnifying glass. Where is the object positioned, and is the image real or virtual? position of object image --- --- --- A closer to the lens…
Answer this question and get it marked →The diagram represents a sound wave travelling from left to right in a solid. A rarefaction is labelled R and a compression is labelled C; the wave direction is shown. R is a…
Answer this question and get it marked →A resistor of resistance 3.0 Ω is connected to a 6.0 V power supply. What is the rate of flow of charge through the resistor? A 0.50 C / min B 2.0 C / min C 30 C / min D 120 C /…
Answer this question and get it marked →A power supply causes a current in a circuit. The electromotive force (e.m.f.) of the power supply and the resistance of the circuit are both changed. Which two changes must…
Answer this question and get it marked →Which circuit shows a voltmeter that measures the potential difference (p.d.) across a variable resistor? The four circuit diagrams A, B, C and D each show a voltmeter (V)…
Answer this question and get it marked →An electric circuit contains two resistors connected to a cell. One resistor is labelled R. The switch is shown open in the diagram. The switch is now closed. What happens to the…
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