S3 Integrated Science Practice Paper: Cells And Life Processes, Matter And The Particle Model, Force And Motion, Energy, Earth And Space, Scientific Investigation Skills (100 Marks)

S3 Integrated Science Practice Paper: Cells and Life Processes, Matter and the Particle Model, Force and Motion, Energy, Earth and Space, Scientific Investigation Skills (100 marks)

2026-11-14

S3 Integrated Science – School Exam Practice

S3 Integrated Science practice paper: 24 parts on cells, the particle model, force and motion, energy, earth and space, with answers.

Paper details　S3 Integrated Science practice paper with full answers and marking notes: cells, particle model, force and motion, energy, earth and space, investigation skills.

Part A: Cells and Life Processes

Part A carries 4 to 5 marks each. Answer in complete sentences.

#	Question	Answer and marking notes
1	A microscope has a 10x eyepiece and a 40x objective lens. Find the total magnification.	400 times (3 marks multiplying the two, 1 mark answer with unit)
2	Which organelle in a cell carries out respiration and releases energy?	Mitochondria (3 marks name, 1 mark function)
3	Write the word equation for photosynthesis.	Carbon dioxide + water -> (light, chlorophyll) glucose + oxygen (2 marks reactants, 2 marks products)
4	A cell measures 60 mm in a micrograph taken at 500 times magnification. Find the real length in micrometres.	120 micrometres (3 marks dividing by magnification, 1 mark unit conversion, 1 mark answer)

Part B: Matter and the Particle Model

Show working and units in all calculations.

#	Question	Answer and marking notes
5	A metal block has a mass of 240 g and a volume of 30 cm3. Find its density.	8 g/cm3 (3 marks formula, 1 mark answer with unit)
6	Will the metal block float or sink in water? Explain.	It sinks (2 marks comparison, 2 marks explanation: density is greater than water)
7	Name the change of state when a solid turns to a liquid and when a liquid turns to a gas.	Melting (2 marks); vaporisation or boiling or evaporation (2 marks)
8	A salt solution has a mass of 250 g and contains 15 g of salt. Find the percentage by mass of salt.	6 percent (3 marks formula, 1 mark multiplying by 100, 1 mark answer)

Part C: Force and Motion

Take g = 10 N/kg. Show working and units in all calculations.

#	Question	Answer and marking notes
9	A runner covers 120 m in 20 s. Find the average speed.	6 m/s (3 marks formula, 1 mark answer with unit)
10	A car accelerates from rest to 12 m/s in 4 s. Find the acceleration.	3 m/s2 (2 marks change in velocity, 1 mark division, 1 mark answer)
11	Find the weight of an object of mass 5 kg on Earth (g = 10 N/kg).	50 N (3 marks using W = mg, 1 mark answer with unit)
12	A person pushes a box 6 m with a horizontal force of 40 N. Find the work done.	240 J (3 marks formula, 1 mark unit, 1 mark answer)

Part D: Energy and Energy Transfers

Take g = 10 N/kg. Give efficiency as a percentage.

#	Question	Answer and marking notes
13	An object of mass 2 kg moves at 3 m/s. Find its kinetic energy.	9 J (2 marks squaring the speed, 2 marks applying the formula)
14	A book of mass 2 kg is lifted 5 m. Find the gain in gravitational potential energy.	100 J (3 marks formula, 1 mark answer with unit)
15	A machine does 600 J of work in 20 s. Find its power.	30 W (3 marks formula, 1 mark answer with unit)
16	A machine takes in 500 J and gives 150 J of useful output. Find its efficiency.	30 percent (3 marks division, 1 mark converting to percent, 1 mark answer)

Part E: Earth and Space

Each question in this part carries 4 marks. Answer briefly.

#	Question	Answer and marking notes
17	Name, in order, the processes in the water cycle by which sea water becomes vapour and vapour becomes droplets.	Evaporation (2 marks); condensation (2 marks)
18	Rocks are grouped into three types by origin. Name two of them and how each forms.	Igneous (magma cools) 2 marks; sedimentary (compacted sediments) or metamorphic (heat and pressure) 2 marks
19	How long does one rotation of the Earth take, and which two everyday effects does it cause?	About 24 hours (2 marks); day and night (1 mark), apparent movement of the Sun (1 mark)
20	Seasons are mainly caused by a change during the Earth revolution. Name that factor and state its effect.	Tilt of the Earth axis, about 23.5 degrees (2 marks); it changes daylight length and Sun angle through the year (2 marks)

Part F: Scientific Investigation and Practical Skills

Each question in this part carries 4 marks. Give answers to a suitable number of significant figures.

#	Question	Answer and marking notes
21	An experiment tests how light intensity affects the rate of photosynthesis. State the independent variable, the dependent variable and one controlled variable.	Independent: light intensity (1 mark); dependent: rate of photosynthesis (1 mark); controlled variable such as temperature (2 marks)
22	Three readings of a length are 12.4, 12.6 and 12.8 cm. Find the mean.	12.6 cm (2 marks total, 1 mark dividing by three, 1 mark answer with unit)
23	Convert 3.5 m into cm and into mm.	350 cm and 3500 mm (2 marks each: 1 mark value, 1 mark unit)
24	State two safety precautions and one piece of personal protective equipment for a heating experiment.	Two sensible precautions, 1 mark each; goggles or lab coat as protective equipment, 2 marks

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