ICSE Class 8 Science · Exam Practice

Science Practice Paper — Set 1

Science Practice Paper — Set 1. ICSE Class 8 Science, covering circulation, the endocrine system, ecosystems, atomic structure, hydrogen, chemical reactions, force and pressure, heat transfer, household electricity and static electricity, with a full answer key and worked solutions.

🎯 Full Marks: 50⏱️ Time: 1½ Hours📝 Questions: 30
SectionType of questionsQsMarks
AMultiple Choice Questions1010
BFill in the Blanks & True / False88
CShort Answer Questions816
DProblem Solving416
Total3050
Before you start
  • This paper samples across the ICSE Class 8 Science chapters on MuskMeadow: circulation, the endocrine system, ecosystems, atomic structure, hydrogen, chemical reactions, force and pressure, heat transfer, household electricity and static electricity.
  • Attempt the paper first, without looking at the answer key at the bottom of the page.
  • Show your working for Sections C and D — method marks are given even if the final answer is wrong.
  • This is a MuskMeadow practice paper. It is not an official CISCE paper and its mark scheme does not copy the board's exact pattern.
10 MARKS

Section A — Multiple Choice Questions

Choose the correct option. (1 mark each)

1. A force of 100 N acts on an area of 0.5 m². The pressure is

A. 50 PaB. 200 PaC. 100.5 PaD. 0.005 Pa

2. The hormone insulin is produced by the

A. thyroidB. pancreasC. liverD. pituitary

3. Hydrogen gas is produced when zinc reacts with

A. water at room temperatureB. dilute hydrochloric acidC. sodium chlorideD. sugar solution

4. The first member of the alkane series is

A. ethaneB. methaneC. propaneD. butane

5. In a food chain, the producers are

A. herbivoresB. carnivoresC. green plantsD. decomposers

6. The number of chambers in the human heart is

A. 2B. 3C. 4D. 5

7. An appliance of 100 W is used for 10 hours. The electrical energy consumed is

A. 1 kWhB. 10 kWhC. 100 kWhD. 0.1 kWh

8. A glass rod rubbed with silk becomes

A. negatively chargedB. positively chargedC. neutralD. magnetic

9. The mass number of an atom is equal to the

A. number of electronsB. number of protonsC. sum of protons and neutronsD. number of neutrons

10. In human beings, fertilisation takes place in the

A. uterusB. oviduct (fallopian tube)C. ovaryD. vagina
8 MARKS

Section B — Fill in the Blanks & True / False

Fill in each blank, or write True / False. (1 mark each)

11. The ______ gland is called the master gland of the body.

12. Hydrogen is lighter than air. (   )

13. The instrument used to measure atmospheric pressure is the ______.

14. Sound can travel through a vacuum. (   )

15. Water is carried upward in plants by the ______.

16. The SI unit of pressure is the ______.

17. Conduction of heat needs no material medium. (   )

18. A device used to detect electric charge on a body is called an ______.

16 MARKS

Section C — Short Answer Questions

Show your working. (2 marks each)

19. Balance: H₂ + O₂ → H₂O.

20. A 60 W bulb is used for 5 hours every day. How much energy does it use in 30 days?

21. Find the pressure exerted by a force of 50 N on an area of 0.25 m².

22. Write the equation for the laboratory preparation of hydrogen using zinc and dilute sulphuric acid.

23. Which gland secretes adrenaline and when is it released?

24. What first aid should be given for a minor burn?

25. Aluminium has atomic number 13 and 14 neutrons. Find its mass number.

26. Arrange in a food chain: snake, grass, frog, grasshopper.

16 MARKS

Section D — Problem Solving

Show all steps. (4 marks each)

27. A 1500 W heater is used for 2 hours every day for 30 days. If electricity costs ₹6 per unit, find (a) the energy consumed in kWh and (b) the cost.

28. A block of mass 20 kg (g = 10 m/s²) rests on a table. Find the pressure when (a) a face of area 0.2 m² is down and (b) a face of area 0.02 m² is down. (c) By what factor does the pressure change? Why?

29. (a) Write the balanced equation for zinc reacting with dilute hydrochloric acid. (b) Using Zn = 65 and H = 1, find the mass of hydrogen released by 13 g of zinc. (c) How is hydrogen tested?

30. Grass in an ecosystem stores 20,000 J of energy. Using the 10% law along the chain grass → grasshopper → frog → snake, find the energy available at (a) the grasshopper, (b) the frog and (c) the snake. (d) Why is the energy less at each level?

ICSE Class 8 Science · Science Practice Paper — Set 1 · Answer Key

Answers & Worked Solutions

Check your paper, then read the solutions for the questions you missed.

Section A — Multiple Choice Questions (10 marks)
Q1. B. 200 Pa

Pressure = force/area = 100/0.5 = 200 Pa.

Q2. B. pancreas

The pancreas makes insulin, which lowers blood sugar.

Q3. B. dilute hydrochloric acid

Zn + 2HCl → ZnCl₂ + H₂.

Q4. B. methane

Methane, CH₄.

Q5. C. green plants

Green plants make their own food by photosynthesis.

Q6. C. 4

Two atria and two ventricles.

Q7. A. 1 kWh

Energy = 0.1 kW × 10 h = 1 kWh (one unit).

Q8. B. positively charged

The glass loses electrons to the silk, so it becomes positive.

Q9. C. sum of protons and neutrons

Mass number = protons + neutrons.

Q10. B. oviduct (fallopian tube)

The sperm and ovum usually meet in the oviduct.

Section B — Fill in the Blanks & True / False (8 marks)
Q11. pituitary

It controls several other endocrine glands.

Q12. True

It is the lightest gas known.

Q13. barometer

Mercury and aneroid barometers are common.

Q14. False

Sound needs a material medium.

Q15. xylem

Phloem carries food.

Q16. pascal

1 Pa = 1 N/m².

Q17. False

Conduction needs matter; only radiation can pass through a vacuum.

Q18. electroscope

The leaves of a gold-leaf electroscope diverge when charged.

Section C — Short Answer Questions (16 marks)
Q19. 2H₂ + O₂ → 2H₂O
  1. Put 2 before H₂O to balance oxygen.
  2. Then 2 before H₂ to balance hydrogen: 2H₂ + O₂ → 2H₂O.
Q20. 9 kWh
  1. Energy per day = 0.06 kW × 5 h = 0.3 kWh.
  2. In 30 days = 0.3 × 30 = 9 kWh.
Q21. 200 Pa
  1. P = F/A.
  2. P = 50/0.25 = 200 Pa.
Q22. Zn + H₂SO₄ → ZnSO₄ + H₂
  1. Zinc displaces hydrogen from the dilute acid.
  2. Zn + H₂SO₄ → ZnSO₄ + H₂↑.
Q23. Adrenal gland, in emergencies
  1. Adrenaline is secreted by the adrenal glands above the kidneys.
  2. It prepares the body for “fight or flight” in fear or danger.
Q24. Cool it under running water
  1. Hold the burnt area under cool running water for about 10 minutes.
  2. Cover it with a clean cloth; do not apply ice, butter or toothpaste.
Q25. 27
  1. Mass number = protons + neutrons.
  2. 13 + 14 = 27.
Q26. Grass → grasshopper → frog → snake
  1. The producer, grass, comes first.
  2. Each organism is eaten by the next: grass → grasshopper → frog → snake.
Section D — Problem Solving (16 marks)
Q27. (a) 90 kWh (b) ₹540
  1. (a) Energy per day = 1.5 kW × 2 h = 3 kWh; for 30 days = 90 kWh.
  2. (b) Cost = 90 × 6 = ₹540.
Q28. (a) 1000 Pa (b) 10,000 Pa (c) 10 times
  1. Weight = 20 × 10 = 200 N, which is the force on the table.
  2. (a) P = 200/0.2 = 1000 Pa.
  3. (b) P = 200/0.02 = 10,000 Pa.
  4. (c) The area is 10 times smaller, so pressure is 10 times greater: pressure = force/area, and the force is unchanged.
Q29. (a) Zn + 2HCl → ZnCl₂ + H₂ (b) 0.4 g (c) burns with a pop
  1. (a) Zn + 2HCl → ZnCl₂ + H₂.
  2. (b) 65 g Zn gives 2 g H₂, so 13 g Zn gives 13 × 2/65 = 0.4 g H₂.
  3. (c) A burning splinter brought near the gas makes a “pop” sound as it burns.
Q30. (a) 2000 J (b) 200 J (c) 20 J
  1. (a) 10% of 20,000 = 2000 J.
  2. (b) 10% of 2000 = 200 J.
  3. (c) 10% of 200 = 20 J.
  4. (d) Most energy is used up in life processes or lost as heat, so only about 10% passes on.
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