IGCSE Science - Combined (0653) — 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 →What is a characteristic of all living things? A egestion B ingestion C nutrition D photosynthesis
Answer this question and get it marked →Which structure is found only in plant cells? A cell membrane B cytoplasm C large vacuole D nucleus
Answer this question and get it marked →The graph shows how the rate of an enzyme-controlled reaction varies with temperature. At which labelled point does the enzyme have the least kinetic energy? B rate of reaction 3…
Answer this question and get it marked →In plants, which energy transfer occurs in chlorophyll during photosynthesis? A chemical to light B heat to chemical C light to chemical D chemical to heat
Answer this question and get it marked →Which row matches the part of the alimentary canal to its function? part of the function of part alimentary canal A anus absorption B oesophagus digestion C mouth ingestion D…
Answer this question and get it marked →The list gives two ways in which an environment changes. 1 humidity increases 2 temperature increases Which changes cause an increase in the rate of transpiration of plants? 1 2…
Answer this question and get it marked →From which chamber does the blood leave the heart to travel to the organs of the body? D A B C
Answer this question and get it marked →Which processes require energy? 1 growth 2 maintenance of body temperature 3 protein synthesis A 1, 2 and 3 B 1 only C 2 and 3 only D 3 only
Answer this question and get it marked →What is caused by the secretion of adrenaline? blood glucose pulse rate pupil size concentration A decreases decreases increases B decreases increases decreases C increases…
Answer this question and get it marked →Which definition of asexual reproduction is correct? A production of genetically different offspring from one parent B production of genetically different offspring from two…
Answer this question and get it marked →Which row shows the correct information about a human female gamete? contains an can swim energy store A ✓ ✗ B ✓ ✓ C ✗ ✓ D ✗ ✗
Answer this question and get it marked →The diagram shows part of a food web. eagle lizard hawk snake rabbit grasshopper mouse grass carrot plants Which row shows the numbers of different types of consumers present in…
Answer this question and get it marked →Eutrophication typically occurs as the result of nitrates and other ions accumulating in bodies of water. Eutrophication involves the five processes listed. 1 death of organisms…
Answer this question and get it marked →The diagrams show four different mixtures of gases. Each diagram (A, B, C, D) shows several molecules drawn as joined circles, where each circle represents an atom and different…
Answer this question and get it marked →The nucleon number of an atom of chlorine is 35. Which statement about this atom is correct? A It contains the same number of neutrons as electrons. B It contains the same number…
Answer this question and get it marked →Which dot-and-cross diagram represents lithium fluoride, LiF? A B + – Li F Li F C D + – Li F Li F
Answer this question and get it marked →Aqueous sodium sulfate reacts with aqueous barium chloride to make barium sulfate and sodium chloride. What is the ionic equation for this reaction? A Ba2+(aq) + SO42–(aq) →…
Answer this question and get it marked →Dilute sulfuric acid is electrolysed using inert electrodes. The concentration of two ions decreases during this process. What are these ions? A hydrogen ions and oxide ions B…
Answer this question and get it marked →Substances P and Q react together. P + Q → R + S The energy level diagram for this reaction is shown. R + S energy Y P + Q progress of reaction Which statement about this reaction…
Answer this question and get it marked →Iron displaces copper from copper oxide. Fe + CuO → FeO + Cu Magnesium displaces iron from iron oxide. Mg + FeO → Fe + MgO Which statement about these reactions is correct? A…
Answer this question and get it marked →Which two substances both react with dilute sulfuric acid to make the salt magnesium sulfate? A magnesium carbonate and magnesium chloride B magnesium chloride and magnesium…
Answer this question and get it marked →The results of two tests on a white solid are shown. test result 1 add aqueous sodium hydroxide white precipitate formed 2 add dilute hydrochloric acid colourless gas formed What…
Answer this question and get it marked →Which statement explains how a greater number of outer-shell electrons affects the metallic character of an element? A The element is more metallic because electrons are lost less…
Answer this question and get it marked →Copper oxide is heated with carbon as shown. copper oxide and carbon crucible tripod Bunsen burner Which statement about this experiment is correct? A A pink-brown solid is…
Answer this question and get it marked →Some gases in air are listed. 1 carbon dioxide 2 oxygen 3 methane 4 sulfur dioxide Which gases cause an enhanced greenhouse effect when their concentration in the air increases? A…
Answer this question and get it marked →Which statement about all alkanes is correct? A They contain the same number of carbon atoms. B They have different chemical properties. C They have the same general formula. D…
Answer this question and get it marked →Which structure represents a molecule that is not formed during cracking of large alkane molecules? A B C D H H H O H C H C C H H H H H H H
Answer this question and get it marked →The diagram shows the speed–time graph for a moving object. speed 20 m/s 0 30 time / s What is the distance travelled by the object in 30 s? A 150 m B 300 m C 450 m D 600 m
Answer this question and get it marked →Which statement about mass and weight is correct? A Mass and weight are different types of force. B The mass of an object depends on the strength of the gravitational field in…
Answer this question and get it marked →The diagram shows an extension–load graph for a spring. Which labelled point shows the limit of proportionality for the spring? D extension C B A 0 load
Answer this question and get it marked →A block of metal has a mass of 2.0 kg. The area of contact between the block and a horizontal surface is 100 cm2. The gravitational field strength is 10 N / kg. What is the…
Answer this question and get it marked →An object has speed v and kinetic energy E. What is the mass of the object? E 2E E 2E A B C D v v v2 v2
Answer this question and get it marked →The generator in a power station is rotated by a turbine. Steam from boiling water rotates the turbine. Which energy source is used to produce electricity in this way? A…
Answer this question and get it marked →Which statement describes the molecules in a gas? A They are close together and move about quickly. B They are close together and move about slowly. C They are far apart and move…
Answer this question and get it marked →A student investigates the rate of evaporation of water. Which changes produce the greatest increase in the rate of evaporation of the water? A doubling its temperature and…
Answer this question and get it marked →Two resistors P and Q are connected in parallel to a cell, as shown. P Q The resistance of resistor P is greater than the resistance of resistor Q. Which row gives the…
Answer this question and get it marked →A sound wave passes through air. Which type of wave is a sound wave and in which direction do the air particles vibrate? type of wave direction of vibration A longitudinal…
Answer this question and get it marked →The speed of light c in a vacuum is 3.0 × 108 m / s. Which row relates other speeds to c ? speed of light speed of infrared in glass waves in a vacuum A equal to c equal to c B…
Answer this question and get it marked →A variable power supply is connected to a resistor and there is a current in the resistor. variable power supply current The potential difference (p.d.) across the resistor is…
Answer this question and get it marked →An electric heater has a label stating this information: 240 V, 2400 W, 10 A. What is written on a fuse with a rating that is appropriate for use with this heater? A 5A B 13 A C…
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