## Answer :

**Answer:**

**ICSE Physics Sample Question Paper**

**Time: 2 hours**

**Max Marks: 80**

**Instructions:**

1. Attempt all questions.

2. Answers to this Paper must be written on the paper provided separately.

3. You will not be allowed to write during the first 15 minutes.

4. This time is to be spent reading the question paper.

5. The time given at the head of this Paper is the time allowed for writing the answers.

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**Section A (40 marks)**

**Question 1**

(a) Define force. (2 marks)

(b) State Newton's First Law of Motion and give an example. (3 marks)

(c) Differentiate between mass and weight. (3 marks)

(d) What is meant by the term 'pressure'? Write its SI unit. (2 marks)

**Question 2**

(a) Explain the concept of inertia with an example. (3 marks)

(b) Derive the relation between force, mass, and acceleration. (4 marks)

(c) What is atmospheric pressure? How is it measured? (3 marks)

**Question 3**

(a) State and explain Pascal's Law. (3 marks)

(b) What is meant by 'moment of a force'? Write the formula for calculating it. (2 marks)

(c) A force of 10 N is applied to a lever at a distance of 2 m from the fulcrum. Calculate the moment of the force. (3 marks)

(d) Differentiate between speed and velocity. (2 marks)

**Question 4**

(a) Define friction and state its types. (3 marks)

(b) Describe an experiment to show that liquid pressure increases with depth. (4 marks)

(c) Write down the formula for calculating pressure and explain each term in it. (3 marks)

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**Section B (40 marks)**

**Question 5**

(a) A car accelerates from rest to a speed of 30 m/s in 10 seconds. Calculate its acceleration. (3 marks)

(b) State the law of conservation of momentum. (2 marks)

(c) Two objects of masses 3 kg and 5 kg are moving with velocities of 4 m/s and 2 m/s, respectively. Calculate their combined momentum. (5 marks)

**Question 6**

(a) Explain the working of a hydraulic lift with the help of a diagram. (5 marks)

(b) A force of 500 N acts on an area of 0.25 m². Calculate the pressure exerted. (3 marks)

(c) Describe the principle of a manometer and its use. (2 marks)

**Question 7**

(a) What is the principle of moments? Explain with an example. (4 marks)

(b) A boy of mass 40 kg runs with a velocity of 3 m/s. Calculate his kinetic energy. (3 marks)

(c) Differentiate between uniform and non-uniform motion. Give an example of each. (3 marks)

**Question 8**

(a) Describe the different types of motion with examples. (4 marks)

(b) A block of mass 2 kg is lifted to a height of 5 m. Calculate the work done. (3 marks)

(c) Explain how the surface area affects pressure with an example. (3 marks)

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**End of Question Paper**