IGCSE Science - Combined (0653) — 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 →Which adaptation of root hair cells increases their rate of absorption of water? A large surface area B phloem present C small surface area D xylem present
Answer this question and get it marked →Which statement about diffusion is correct? A Diffusion occurs only in living organisms. B Diffusion occurs only in solution. C Diffusion occurs only through a cell wall. D…
Answer this question and get it marked →Which row contains all of the elements in fats? carbon hydrogen nitrogen oxygen A ✓ ✗ ✓ ✓ B ✓ ✓ ✓ ✗ C ✓ ✓ ✗ ✓ D ✗ ✓ ✓ ✓
Answer this question and get it marked →At which temperature is the enzyme denatured? rate of enzyme activity A B C D temperature
Answer this question and get it marked →A plant shoot is 5 cm tall and has two leaves half way up the stem. What can happen to the simple sugars made by these leaves? 1 move down the stem from the leaves 2 move up the…
Answer this question and get it marked →What is the role of mechanical digestion? A It breaks down large food molecules into smaller molecules. B It forms new chemical compounds for the body to utilise. C It breaks down…
Answer this question and get it marked →From which part of a leaf does water evaporate during transpiration? A the cuticle B the mesophyll cells C the upper epidermis D the stomata
Answer this question and get it marked →Some features of the human gas exchange system are listed. 1 has large surface area 2 contains goblet cells 3 has a good blood supply 4 has ciliated cells 5 inner surfaces are…
Answer this question and get it marked →The diagram shows the apparatus used in an investigation on gas exchange in organisms. In which test-tube would the concentration of oxygen decrease most rapidly? A B C D light…
Answer this question and get it marked →The table shows some statements about reproduction. Which row is correct for asexual reproduction? offspring are offspring are the zygote is genetically identical genetically…
Answer this question and get it marked →The diagram shows an insect-pollinated flower. Which label identifies a petal? A D B C
Answer this question and get it marked →The diagram shows part of the carbon cycle. carbon dioxide in 1 the atmosphere 2 3 fossil fuels 4 carbon compounds carbon compounds in animals in plants carbon compounds in dead…
Answer this question and get it marked →What occurs as a result of eutrophication? A There is a decrease in the availability of nitrate ions. B There is a decrease in the availability of oxygen molecules. C There is a…
Answer this question and get it marked →Which diagram represents a covalent molecule containing three different types of atom? A B H H C O H Na+ SO42– Na+ H C D O K+ K+ H H O2–
Answer this question and get it marked →What is a general property of metals? A They are malleable. B They are soluble in water. C They act as catalysts. D They have low melting points.
Answer this question and get it marked →Which statement about the melting points of aluminium oxide, Al 2O3, and methanol, CH3OH, is correct? A Aluminium oxide has a higher melting point than methanol because ionic…
Answer this question and get it marked →Aqueous lead nitrate and aqueous sodium chloride react to form aqueous sodium nitrate and solid lead chloride. What is the ionic equation for this reaction? A Pb2+(aq) + Cl 2–(aq)…
Answer this question and get it marked →Which energy level diagram identifies the activation energy and the energy change for an exothermic reaction? key: 1 = activation energy 2 = energy change for the reaction Each…
Answer this question and get it marked →Rutile is an ore of titanium. Rutile contains titanium oxide, TiO2. The first step in the extraction of titanium from rutile is heating with chlorine and carbon at a high…
Answer this question and get it marked →Which element reacts with dilute sulfuric acid to form a salt? A carbon B copper C sulfur D zinc
Answer this question and get it marked →Substance X is warmed with aqueous sodium hydroxide and aluminium. A gas is produced which turns damp red litmus paper blue. Which anion is present in X? A carbonate B hydroxide C…
Answer this question and get it marked →Which equation represents a reaction that occurs when a halogen is added to an aqueous potassium halide? A 2KBr + Cl 2 → 2KCl + Br2 B 2KBr + I2 → 2KI + Br2 C 2KCl + Br2 → 2KBr +…
Answer this question and get it marked →Which diagram represents an alloy? A B C D H – + – + + – + – H C O H – + – + + – + – H
Answer this question and get it marked →Which row shows elements in order of reactivity? most reactive least reactive A aluminium iron zinc hydrogen B calcium carbon aluminium copper C magnesium zinc hydrogen copper D…
Answer this question and get it marked →The equations show reactions that occur in the extraction of copper and of iron. 1 2CuO + C → 2Cu + CO2 2 C + O2 → CO2 3 CO2 + C → 2CO 4 Fe2O3 + 3CO → 2Fe + 3CO2 Which equations…
Answer this question and get it marked →Which processes contribute to the enhanced greenhouse effect? 1 the electrolysis of concentrated aqueous sodium chloride 2 the extraction of iron in a blast furnace 3 the reaction…
Answer this question and get it marked →Which statement about alkanes is correct? A They are unsaturated hydrocarbons. B They are very reactive. C They burn to form carbon dioxide and hydrogen. D They contain only…
Answer this question and get it marked →A train travels between two stations. The distance–time graph for the train is shown. At which labelled time is the train travelling the fastest? distance 0 A B C D time
Answer this question and get it marked →A student performs an experiment to determine the density of an irregularly shaped stone. The student pours some water into a measuring cylinder and then lowers the stone into the…
Answer this question and get it marked →Which energy source is renewable? A geothermal B natural gas C nuclear fission D oil
Answer this question and get it marked →What is the main energy transfer that takes place in the Sun? A chemical potential energy to thermal energy B thermal energy to chemical potential energy C thermal energy to…
Answer this question and get it marked →Which row describes the arrangement and separation of the particles in a liquid? arrangement of particles separation of particles A random closer than in a gas B random further…
Answer this question and get it marked →An open container in a laboratory contains water. The container is placed on a bench near a closed window. The container is in bright sunlight and it is a windy day outside. The…
Answer this question and get it marked →A sound wave travels in air. What is the name of the region of the wave where the separation of particles is greatest? A compression B medium C rarefaction D reflection
Answer this question and get it marked →A loudspeaker vibrates with different amplitudes and at different frequencies to make a sound. Which amplitude and frequency produces the louder, higher-pitched sound? A large…
Answer this question and get it marked →The diagram shows two charged metal spheres, P and Q, suspended from insulating threads. P is positively charged and Q is negatively charged. insulating threads P Q +++ ––– + + –…
Answer this question and get it marked →A circuit includes a lamp, a switch and an ammeter. The switch is open. A The switch is now closed and the ammeter displays the reading shown. 4 6 2 8 0 10 A The switch remains…
Answer this question and get it marked →A wire of length 3.0 m and cross-sectional area of 0.24 mm2 has a resistance of 6.0 Ω. A second wire, made from the same material, has a cross-sectional area of 0.12 mm2 and a…
Answer this question and get it marked →A car has two headlamps connected in parallel to a 12 V battery. The power of each headlamp is 60 W. What is the total energy supplied by the battery to the two headlamps in 5.0…
Answer this question and get it marked →A 4.0 Ω resistor and a 6.0 Ω resistor are connected in parallel. What is the combined resistance of the two resistors? A 0.42 Ω B 2.4 Ω C 5.0 Ω D 10 Ω reasonable effort has been…
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