KS3 Science Revision Quiz (Batch 1 of 2)
25 medium-difficulty multiple-choice questions for KS3 science revision. Clear, varied angles and concise explanations to support learning.
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Quiz Questions & Answers
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Question 1: Which statement best describes the relationship between mass and weight?
Mass changes with location; weight never changes
Mass is the amount of matter; weight is the force of gravity on that mass
Weight is the same as density; mass is the same as volume
Mass and weight are identical physical quantities
Question 2: What is a chemical change that indicates a reaction has occurred?
Mixing two substances without any new properties
Change in state from solid to liquid only
Temporary change in shape when force is applied
Formation of a new substance with different properties
Question 3: Which organelle is the site of aerobic respiration in cells?
Mitochondrion
Golgi apparatus
Ribosome
Chloroplast
Question 4: Which best explains why metals conduct electricity?
They have freely moving delocalised electrons
They are liquids at room temperature
They contain ionic bonds holding charged ions
They are always magnetic materials
Question 5: Which process describes water moving up plant stems against gravity?
Active transport of water into leaves
Transpiration pull through xylem
Diffusion of water across bark
Photosynthesis in the roots
Question 6: What is the main greenhouse gas produced by human activities that traps heat?
Nitrogen
Argon
Oxygen
Carbon dioxide
Question 7: Why are isotopes of an element chemically similar but physically different?
They have different numbers of protons but same neutrons
They have the same electrons but different numbers of neutrons
They are different elements that react similarly
They have the same mass but different structures
Question 8: What happens to the total energy in a closed system during an engine’s operation?
Energy is created during the process
Energy disappears as the engine runs
Total energy is conserved but converts between forms
Mass increases to conserve energy
Question 9: Which best describes diffusion in gases or liquids?
Instant transport across any distance
Random movement from higher to lower concentration
Active pumping by cells in all cases
Movement only in solids under pressure
Question 10: Why are catalytic converters important in car exhaust systems?
They increase the engine's chemical energy
They speed up reactions that convert pollutants into less harmful gases
They store fuel for later use
They cool the exhaust to reduce noise
Question 11: Which type of reaction is required to break a polymer into its monomers using water?
Oxidation
Sublimation
Hydrolysis
Combustion
Question 12: When drawing a velocity-time graph, what does the slope represent?
Distance travelled
Force applied
Mass of the object
Acceleration
Question 13: Which property of a substance remains the same during a physical change?
Atomic numbers of elements change
New substances are produced
Chemical identity of the substance
Its ability to react chemically is always changed
Question 14: What is the main function of enzymes in biological reactions?
They provide energy for reactions
They act as structural proteins only
They lower activation energy to speed up reactions
They permanently change the substrate
Question 15: Which technique is best for separating an insoluble solid from a liquid?
Chromatography
Distillation
Filtration
Electrolysis
Question 16: Why does increasing temperature generally increase the rate of a chemical reaction?
Particles have more kinetic energy and more frequent effective collisions
Temperature adds new reactants to the mixture
It changes the conservation of mass
Heat always acts as a catalyst
Question 17: Which process describes energy transfer by electromagnetic waves without needing particles?
Convection
Conduction
Diffusion
Radiation
Question 18: What is an example of a reversible chemical change commonly studied at KS3?
Burning magnesium in air
Ammonium chloride decomposing on heating and reforming on cooling
Combustion of petrol
Rust formation on iron
Question 19: Which structure in the human body exchanges gases between air and blood?
Bronchioles in the heart
Alveoli in the lungs
Villi in the small intestine
Nephrons in the kidneys
Question 20: How does increasing surface area affect the rate of a chemical reaction when a solid is a reactant?
It prevents the reaction from occurring
It increases the rate by exposing more particles to collide
It decreases the rate by reducing collisions
It has no effect on reaction rate
Question 21: Which simple model explains the arrangement and motion of particles in solids, liquids and gases?
Wave-particle duality
String theory
Quantum tunnelling model
Particle model (kinetic theory)
Question 22: Why is conserving biodiversity important for ecosystems?
It only affects silent species not seen
It makes ecosystems less useful to humans
It always reduces primary productivity
It maintains ecosystem stability and resilience to change
Question 23: Which device measures electric current in a circuit?
Barometer
Ammeter
Thermometer
Voltmeter
Question 24: What is a sensible safety precaution when heating liquids in a lab?
Heat under a closed lid to trap steam
Seal the tube completely while heating
Point the open end of a boiling tube away from people
Hold it with bare hands without tongs
Question 25: Which factor does NOT affect the rate at which a soluble solid dissolves in water?
The colour of the solid
Temperature of the solvent
Surface area of the solid
Stirring the solution
Question 26: Which force pair always acts in opposite directions and are equal when an object pushes on a wall and the wall pushes back?
Weight and lift
Friction and normal force
Action and reaction forces (Newton's third law)
Applied force and tension
Question 27: A circuit has a battery, a lamp and a switch. Which change will make the lamp glow brighter if the battery voltage is fixed?
Increase the length of the wires
Open the switch slightly
Decrease the total circuit resistance
Add another identical lamp in series
Question 28: Which human action would most directly increase nutrient runoff into rivers, harming aquatic life?
Installing fish ladders on weirs
Building small dams for hydroelectric power
Replanting native trees along riverbanks
Applying large amounts of fertiliser on fields before heavy rain
Question 29: Which description best explains why solids generally have a fixed shape?
Particles are closely packed and vibrate about fixed positions
Particles are widely separated and collide often
Particles form long chains that slide past each other
Particles move freely and randomly throughout the container
Question 30: A student measures the temperature change when an acid neutralises an alkali. Which variable should be controlled to make the test fair?
Brand of the thermometer
Colour of the containers
Time of day the experiment is done
Concentration and volume of the acid and alkali used
Question 31: Which statement about waves best predicts what happens when waves pass through a narrow gap similar in size to their wavelength?
They diffract and spread out into the region beyond the gap
They are absorbed and disappear
They reflect perfectly with no change in direction
They speed up and a higher frequency appears