IGCSE Science - Combined (0653) — 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 →Which row correctly identifies the function of a ciliated cell in the bronchus of a healthy human? substance being moved direction of movement --- --- --- A air towards…
Answer this question and get it marked →Water enters a plant cell. In which order does the water pass through the cell structures before reaching the vacuole? A cell membrane → cell wall → cytoplasm B cell wall → cell…
Answer this question and get it marked →Which row describes an enzyme? molecule function --- --- --- A carbohydrate biological catalyst B carbohydrate hormone C protein biological catalyst D protein hormone
Answer this question and get it marked →What is a symptom of iron deficiency? A constipation B feeling tired C coronary heart disease D scurvy
Answer this question and get it marked →Chemical digestion produces small, soluble molecules. For which process is chemical digestion necessary? A absorption B egestion C excretion D ingestion
Answer this question and get it marked →The diagram shows a section through the human heart. The four valves are labelled W, X, Y and Z (W and X near the top, Z and Y in the middle). When the left ventricle contracts,…
Answer this question and get it marked →Which row describes how the oxygen concentration and carbon dioxide concentration in blood changes as the blood passes through the lungs? oxygen concentration carbon dioxide…
Answer this question and get it marked →The incomplete equation for aerobic respiration is shown. X + oxygen → carbon dioxide + water What is the formula of X? A C6H6O12 B C6H12O6 C C12H12O6 D 6CH12O6
Answer this question and get it marked →Which row is correct for auxin in a shoot? effect of auxin side of shoot where more auxin is found --- --- --- A cell division closer to the light B cell division further away…
Answer this question and get it marked →Which row is correct for sexual reproduction? requires gametes offspring produced --- --- --- A yes genetically different B yes genetically identical C no genetically different D…
Answer this question and get it marked →Which diagram shows the stigma and stamen of a wind-pollinated flower? The four diagrams A, B, C and D each show a flower's stigma and stamen arrangement; the wind-pollinated…
Answer this question and get it marked →What is the function of the placenta? A to allow the mixing of the mother's blood with the blood of the fetus B to exchange nutrients and waste C to keep the fetus warm D to stop…
Answer this question and get it marked →What are the effects of deforestation and the combustion of fossil fuels on the concentrations of carbon dioxide and oxygen in the atmosphere? concentration of carbon dioxide…
Answer this question and get it marked →Solid mixtures X and Y are made from the salts as shown in the table. mixture X mixture Y --- --- barium sulfate: white, insoluble; iron(III) sulfate: brown, soluble potassium…
Answer this question and get it marked →Which particle has the smallest mass? A atom B electron C neutron D proton
Answer this question and get it marked →Which dot-and-cross diagram represents the bonding in a molecule of ethene? The four options A, B, C and D each show a dot-and-cross diagram for two carbon atoms bonded to…
Answer this question and get it marked →What are the correct numbers of atoms in one molecule of nitric acid? hydrogen nitrogen oxygen --- --- --- --- A 1 1 3 B 1 3 1 C 2 1 3 D 2 3 1
Answer this question and get it marked →Molten silver chloride is electrolysed using inert electrodes. Which statement about this electrolysis is correct? A Silver ions gain electrons at the anode. B Silver ions gain…
Answer this question and get it marked →The reaction of bromine with ethene is exothermic. Which statement about this reaction is correct? A The activation energy is greater than the energy released in bond formation. B…
Answer this question and get it marked →Which row describes what happens to the rate of reaction and the frequency of collisions between particles when the concentration of a reactant is increased? rate of reaction…
Answer this question and get it marked →Which statements about an oxidising agent are correct? 1 It is oxidised in a redox reaction. 2 It is reduced in a redox reaction. 3 It oxidises another substance in a redox…
Answer this question and get it marked →Magnesium chloride crystals can be made by reacting solid magnesium carbonate with dilute hydrochloric acid. What is not used in this process? A excess solid B crystallisation C…
Answer this question and get it marked →Which statement about the halogens is correct? A Aqueous sodium bromide reacts with chlorine to produce aqueous sodium chloride. B Aqueous sodium chloride reacts with iodine to…
Answer this question and get it marked →Which metal is extracted from bauxite? A aluminium B copper C iron D zinc
Answer this question and get it marked →Two different bottles each contain a colourless liquid. One bottle contains an alkene and the other contains water. Three different tests are listed. 1 addition of pink cobalt(II)…
Answer this question and get it marked →Which statement about greenhouse gases is correct? A Increased concentrations of greenhouse gases cause a reduced greenhouse effect, which may contribute to climate change. B…
Answer this question and get it marked →Q, R and S are fossil fuels. The main constituent of Q is methane. R is a source of diesel oil and bitumen. S is burned in car engines. Which row identifies Q, R and S? Q R S ---…
Answer this question and get it marked →Which distance–time graph represents an object that is moving with changing speed? The four graphs A, B, C and D each plot distance (y-axis) against time (x-axis). A changing…
Answer this question and get it marked →Which statement about mass and weight is correct? A Mass is the gravitational field that acts on a weight. B Mass is the gravitational force that acts on a weight. C Weight is the…
Answer this question and get it marked →A luggage trolley is pushed with a horizontal force of 120 N. The diagram shows a luggage trolley being pushed by a horizontal 120 N force. The trolley travels a distance of 500…
Answer this question and get it marked →A brick of mass 3.0 kg rests on a shelf. The brick falls from the shelf. The brick hits the ground at a speed of 8.0 m / s. Ignore air resistance. How much kinetic energy does the…
Answer this question and get it marked →Which row states an advantage and a disadvantage of the energy resource given? energy resource advantage disadvantage --- --- --- --- A natural gas renewable produces carbon…
Answer this question and get it marked →The water in four containers is at the same temperature. There is a movement of air over the surface of containers A and B but not over C and D. The diagram shows four open…
Answer this question and get it marked →An aluminium cap is screwed onto the top of an aluminium bottle. The diagram shows an aluminium cap on an aluminium bottle. The cap is difficult to unscrew. Which action makes…
Answer this question and get it marked →A metal bar is heated at one end. The diagram shows a metal bar being heated at one end. What is the main method by which thermal energy reaches the other end of the bar? A…
Answer this question and get it marked →Three types of wave are listed. 1 microwaves 2 sound waves 3 radio waves Which waves are longitudinal waves? A 1 and 2 B 1 and 3 C 1 only D 2 only
Answer this question and get it marked →A wave is refracted when it moves from one medium to another. What must remain constant? A direction of motion B frequency C speed D wavelength
Answer this question and get it marked →The current in a resistor is 4.0 A. What is the time taken for 1200 C of charge to flow through the resistor? A 0.20 min B 5.0 min C 80 min D 300 min
Answer this question and get it marked →A student connects a lamp to a cell. Which change to the circuit can increase the current in the circuit? A connecting a second cell in series B connecting a second lamp in series…
Answer this question and get it marked →Four ammeters, V, W, X and Y, are connected in the circuit shown. The circuit has two parallel branches: ammeters V and W are in the top branch, ammeters Y and X are in the bottom…
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