IGCSE Sciences - Co-Ordinated (0654) — October–November 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 →1 A person throws a ball which their dog runs after and brings back to them. Which characteristics of living things is the dog showing by this action? A growth and nutrition B…
Answer this question and get it marked →2 The diagram shows a section through a red blood cell. Which statement is correct for red blood cells? A The cell has no nucleus to minimise oxygen binding. B The cell membrane…
Answer this question and get it marked →3 Which food test requires heating? A fat B protein C reducing sugar D starch 3
Answer this question and get it marked →4 The diagram shows the effect of temperature on enzyme activity. enzyme Y activity X temperature What has increased the enzyme activity between points X and Y? A decreased…
Answer this question and get it marked →5 Plants need magnesium ions and nitrate ions. Which statements correctly show what the plants make using these ions? 1 Magnesium ions are needed for making amino acids. 2 Nitrate…
Answer this question and get it marked →6 Which statements about mechanical digestion are correct? 1 Food is broken down into smaller pieces. 2 Food molecules do not undergo chemical changes. 3 Soluble molecules are…
Answer this question and get it marked →7 Which row names the substances carried by xylem vessels and the direction of travel? substances direction of travel A sucrose only leaves to roots B sucrose only roots to leaves…
Answer this question and get it marked →8 What is the expected concentration of oxygen and the water vapour content in expired air? oxygen / % water vapour A 16 saturated B 16 variable C 21 saturated D 21 variable
Answer this question and get it marked →9 Which statement about the role of blood vessels in the skin is correct? A If the environment is too cold, vasoconstriction of capillaries occurs. B If the environment is too…
Answer this question and get it marked →10 The table shows some features of insect-pollinated flowers and wind-pollinated flowers. Which rows are correct? insect-pollinated flowers wind-pollinated flowers 1 anthers…
Answer this question and get it marked →11 What is a difference between a haploid nucleus and a diploid nucleus from the same plant? A The diploid nucleus has more chromosomes. B The diploid nucleus is the result of…
Answer this question and get it marked →12 What is an ecosystem? A a network of interconnected food chains in a given area B all the members of one species in a given habitat C all the organisms and their environment…
Answer this question and get it marked →13 Which row describes the effects of deforestation? level of risk of carbon dioxide flooding in the air A decreases decreases B decreases increases C increases decreases D…
Answer this question and get it marked →14 The colours in an ink are separated by chromatography. Which diagram shows the assembled apparatus? A B spot of ink spot of ink solvent solvent C D spot of ink spot of ink…
Answer this question and get it marked →15 Which diagram represents a mixture of an element and a compound? A B C D
Answer this question and get it marked →16 X and Y are isotopes of the same element. Which statement about X and Y is correct? A They have the same nucleon number but different numbers of protons. B They have the same…
Answer this question and get it marked →17 Nonane, C9H20, burns in oxygen to form carbon dioxide and water. The equation for this reaction is shown. C9H20 + 14O2 9CO2 + 10H2O What is the mass of oxygen required for…
Answer this question and get it marked →18 Which statement correctly describes how aluminium is changed during the electrolysis of aluminium oxide? A At the anode, aluminium ions gain electrons and so are oxidised. B At…
Answer this question and get it marked →19 Dilute hydrochloric acid is reacted with magnesium. The reaction is repeated using a higher concentration of acid. Which statement about the second reaction is not correct? A…
Answer this question and get it marked →20 A piece of damp blue litmus paper is put in a test-tube of a gas. The litmus paper turns red and then changes to white. What is the gas? A ammonia B carbon dioxide C chlorine D…
Answer this question and get it marked →21 The elements in Group I of the Periodic Table are metals. What are the trends as the group is descended? A decrease in melting point and less reactive with water B decrease in…
Answer this question and get it marked →22 Why is argon used in lamps? A It is heavier than air. B It is lighter than air. C It is reactive. D It is unreactive.
Answer this question and get it marked →23 Which metal can only be extracted from its ore using electrolysis? A calcium B copper C iron D zinc
Answer this question and get it marked →24 Which row shows the conditions used for making ammonia by the Haber process? pressure / atm temperature / C catalyst A 250 450 iron B 250 200 vanadium pentoxide C 2 200 iron D…
Answer this question and get it marked →25 Four reaction equations involving sulfur and its compounds are shown. 1 S + O2 SO2 2 SO2 + H2O H2SO3 3 2H2SO3 + O2 2H2SO4 4 H2SO4 + SO3 H2S2O7 Which reactions take…
Answer this question and get it marked →26 Which formula represents but-1-ene? A CH3CH=CH2 B CH3CH2CH2CH3 C CH3CH2CH=CH2 D CH3CH=CHCH3
Answer this question and get it marked →27 The structure of the monomer chloroethene is shown. H H C C H Cl What is a part of the structure of the addition polymer formed from this monomer? A B H H H H H Cl H Cl C C C C…
Answer this question and get it marked →28 The graph shows the variation of speed with time for an object moving in a straight line. speed 0 0 time Which statement about the motion of the object is correct? A At time 0,…
Answer this question and get it marked →29 Diagram 1 shows a spring with its length indicated. Diagram 2 shows the same spring with a 20 N load hung from it, and the new length of the spring. The spring obeys Hooke’s…
Answer this question and get it marked →30 30 extension / cm extension / cm 20 20 10 10 0 0 0 10 20 30 0 10 20 30 load / N load / N C D 30 30 extension / cm extension / cm 20 20 10 10 0 0 0 10 20 30 0 10 20 30 load / N…
Answer this question and get it marked →31 An electric motor transfers 4000 J of electrical energy to useful energy and 12 000 J of electrical energy is wasted. What is the efficiency of the motor? A 25% B 33% C 50% D…
Answer this question and get it marked →32 The pressure of a gas in a container is caused by gas molecules colliding with the walls. The pressure can be increased by heating the gas or by reducing its volume. Which row…
Answer this question and get it marked →33 Which statement explains why metals are better thermal conductors than non-metals? A Atoms in metals are fixed in a lattice by bonds. B Atoms in metals vibrate about fixed…
Answer this question and get it marked →34 The sound heard from the siren of a police car becomes quieter and lower pitched as the car moves away from an observer. Which row describes what happens to the amplitude and…
Answer this question and get it marked →35 A bar magnet is brought near to a metal rod. The metal rod is attracted to the magnet. magnet metal rod N S The magnet is then turned around so that the N-pole is on the right.…
Answer this question and get it marked →36 Four resistors are connected into circuits. The current in each resistor and the potential difference (p.d.) across each resistor are shown. Which resistor has a resistance of…
Answer this question and get it marked →37 Two lamps can be connected to a battery either in series or in parallel. Which statement is not a benefit of connecting two lamps in parallel rather than in series? A If one…
Answer this question and get it marked →38 What is the purpose of a fuse in an electric circuit? A to make the circuit more efficient B to protect the circuit from damage by a large current C to provide a constant…
Answer this question and get it marked →39 A current-carrying wire is placed between the poles P and Q of a magnet, as shown. force P Q current The direction of the current is shown. A force acts on the wire upwards, as…
Answer this question and get it marked →40 The diagram shows a beam of -particles and a beam of -rays entering the electric field between two charged plates. + + + + + + + + + + + + β-particles γ-rays – – – – – – – –…
Answer this question and get it marked →← October–November 2023 Paper 31 · October–November 2023 Paper 22 →