IGCSE Science - Combined (0653) — May–June 2025, Paper 13
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Which row shows substances that are removed by the process of excretion? substances in excess of requirements waste products undigested food --- --- --- --- A ✗ ✓ ✓ B ✓ ✗ ✓ C ✓ ✓…
Answer this question and get it marked →The diagram shows an animal cell. A small structure inside the cell is labelled X, located within the cytoplasm. What is the function of part X? A to carry out photosynthesis B to…
Answer this question and get it marked →The diagram shows a food test on some food in solution. 2 cm^3 of food in solution has an equal volume of Benedict's solution added, the mixture is heated in a water-bath, and a…
Answer this question and get it marked →What function as biological catalysts? A antibodies B enzymes C hormones D platelets
Answer this question and get it marked →Which substance is required for photosynthesis to occur? A chlorophyll B glucose C haemoglobin D oxygen
Answer this question and get it marked →The diagram shows a section through a leaf. The upper epidermis is labelled at the top, an air space is labelled in the lower (spongy) layer, and a small structure at the lower…
Answer this question and get it marked →What is meant by a balanced diet in humans? A a diet that contains a lot of fibre to aid food passing through the alimentary canal B a diet that has only enough of each food group…
Answer this question and get it marked →The diagram shows part of the human alimentary canal and associated organs. A large organ in the upper right of the abdomen is labelled W. What is the organ labelled W? A gall…
Answer this question and get it marked →Which row shows what happens to soluble food molecules after food is chemically digested? name of process what happens to soluble food molecules --- --- --- A ingestion pass…
Answer this question and get it marked →The diagrams show sections through different parts of a dicotyledonous plant (leaf, stem and root). In the leaf, tissues are labelled P and Q; in the stem, tissues are labelled R…
Answer this question and get it marked →Which part of the female reproductive system matches its function? part of the female reproductive system function --- --- --- A cervix ring of muscle at the opening of the uterus…
Answer this question and get it marked →The diagram shows a food web. Grass is eaten by rabbit and vole; rowan tree is eaten by beetle; vole, beetle, rabbit and frog feed into pine marten; beetle is eaten by frog. Which…
Answer this question and get it marked →The diagram represents part of the carbon cycle, with boxes for 'carbon dioxide in air', 'animals', 'plants' and 'decomposers'. Numbered arrows show: 1 (animals to carbon dioxide…
Answer this question and get it marked →Which electronic configuration represents a noble gas? A 2 B 2,1 C 2,2 D 2,3
Answer this question and get it marked →What happens when a sodium atom reacts with a chlorine atom? A The sodium atom and chlorine atom lose electrons. B The sodium atom gains an electron and the chlorine atom loses an…
Answer this question and get it marked →What is produced when calcium reacts with dilute hydrochloric acid? A calcium chloride + hydrogen B calcium chloride + water C calcium hydroxide + chlorine D calcium hydroxide +…
Answer this question and get it marked →The diagram shows the apparatus for electrolysis. Two electrodes dip into a liquid in a beaker; the left electrode (W) is connected to the negative terminal and the right…
Answer this question and get it marked →Magnesium ribbon is added to dilute hydrochloric acid at 20 degrees C. The mixture starts to fizz and the temperature increases to 32 degrees C. The fizzing then stops and the…
Answer this question and get it marked →Which process results in a chemical change? A Heat liquid water to form steam. B Mix powdered carbon and iron filings. C Melt iron filings. D Heat sulfur in air to make sulfur…
Answer this question and get it marked →Which substance contains a covalent bond between two different elements? A chlorine B potassium chloride C hydrogen D hydrogen chloride
Answer this question and get it marked →Universal indicator is placed into a colourless liquid. The colour change of the universal indicator shows that the pH of the liquid is 6. Which statement about the colourless…
Answer this question and get it marked →Sodium nitrate, NaNO3, is a soluble salt. Which method is used to make pure solid sodium nitrate? A Add aqueous sodium hydroxide to a conical flask, titrate with dilute nitric…
Answer this question and get it marked →Iron nails are placed in four test-tubes under different conditions and left for two weeks. The conditions are: A tap water B boiled tap water (oxygen removed) C moist air D…
Answer this question and get it marked →Brass is an alloy. Which statement describes brass? A Brass is made of pure copper. B Brass is a mixture of copper and zinc. C Brass is a mixture of lead and tin. D Brass is made…
Answer this question and get it marked →In the blast furnace, iron(III) oxide reacts with carbon monoxide to form iron. What happens to the iron(III) oxide? A It is oxidised by gaining oxygen. B It is oxidised by losing…
Answer this question and get it marked →A sample of solid sodium chloride is mixed with water and stirred. The sodium chloride dissolves. Which name describes the solid sodium chloride? A solution B solvent C solute D…
Answer this question and get it marked →Separate samples of the gases ammonia, chlorine, hydrogen and oxygen are tested with damp blue litmus paper. How many of these gases change the colour of the litmus paper? A 0 B 1…
Answer this question and get it marked →A stop-watch is used to record the time at two points in a race. The diagram shows the readings. Reading 1 shows 00:01:58 (h:min:s) and reading 2 shows 00:03:04 (h:min:s). What is…
Answer this question and get it marked →Which expression is the definition of density? A mass / volume B volume / mass C volume / weight D weight / volume
Answer this question and get it marked →A car is powered by a petrol engine. The car accelerates from rest along a horizontal road. Which energy transfer occurs? A electrostatic - kinetic B electrostatic - gravitational…
Answer this question and get it marked →Two cylinders contain the same type of gas. The gas in one cylinder is at a higher temperature than the gas in the other cylinder. Which statement must be correct? A In one…
Answer this question and get it marked →The diagram shows a hand held above a candle flame, with the hand positioned to the side of and above the flame rather than directly over it. What is the main method by which…
Answer this question and get it marked →What is the main region of the electromagnetic spectrum involved in thermal energy transfer from the Sun to the Earth? A gamma B infrared C microwave D X-ray
Answer this question and get it marked →The diagram represents a wave drawn on a grid. The vertical extent of the wave (peak to trough) spans 6.0 cm, and the horizontal extent shown spans 8.0 cm and contains two…
Answer this question and get it marked →The diagram shows a wave on water moving towards a straight barrier. The direction of the wave is shown by an arrow, with wavefronts approaching the barrier at an angle from…
Answer this question and get it marked →A student uses electronic equipment to determine the speed of sound in air. The apparatus shows a drum, detector 1, a timer and detector 2 arranged in a line. The student hits the…
Answer this question and get it marked →Which equations for power and energy transferred in an electrical component are correct? power energy --- --- --- A P = V/I E = IV/t B P = V/I E = IVt C P = IV E = IV/t D P = IV E…
Answer this question and get it marked →When the switch in the circuit shown is closed, the lamp glows dimly. The circuit contains a lamp, a cell/battery, an ammeter (labelled A), a switch (labelled B), a variable…
Answer this question and get it marked →The current in a kettle is 8.4 A. Which fuse rating is appropriate for a fuse used to protect the kettle? A 5 A B 8 A C 13 A D 30 A
Answer this question and get it marked →How many stars are there in the Solar System? A 1 B 2 C 8 D 9
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