Physics Test | Class 9 Physics

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Class: 9th
Subject: Physics (SNC)
Chapter: 6 – Mechanical Properties of Matter

Test Date: Current Date
Time Allowed: 60 minutes
Total Marks: 50
Paper Type: Objective + Subjective

Multiple Choice Questions (10×1 = 10 Marks)

1. Two metal plates of area 2 and 3 square metres are placed in a liquid at the same depth. The ratio of pressures on the two plates is:
   (A) 1:1
   (B) 2:3
   (C) 2:4
   (D) 4:9
2. What is the unit of density in the SI system?
   (A) kgm⁻³
   (B) kgm³
   (C) kgm⁻²
   (D) All of these
3. What is pressure?
   (A) Force per unit area
   (B) Force per unit volume
   (C) Area per unit force
   (D) Volume per unit force
4. What is the pressure exerted by a force of 10N on an area of 2 m²?
   (A) 5 Pa
   (B) 10 Pa
   (C) 20 Pa
   (D) 50 Pa
5. What is the effect of increasing the area on which a given force is applied on the pressure?
   (A) Decreases
   (B) Increases
   (C) Remains same
   (D) All of these
6. What happens to pressure in a liquid as depth increases?
   (A) Decreases
   (B) Increases
   (C) Remains same
   (D) Zero
7. What is the instrument used to measure atmospheric pressure?
   (A) Barometer
   (B) Hygrometer
   (C) Anemometer
   (D) None of these
8. What is the relationship between atmospheric pressure and weather?
   (A) High pressure means good weather
   (B) Low pressure means good weather
   (C) High pressure means bad weather
   (D) Low pressure means bad weather
9. What is the importance of atmospheric pressure in aviation?
   (A) It is not important
   (B) It is used to determine the altitude of an aircraft
   (C) It is used to determine the air-speed of an aircraft
   (D) It is used to determine the direction of an aircraft
10. Which of the following is not an example of Pascal’s law?
    (A) Hydraulic press
    (B) Hydraulic brake
    (C) Airplane wing design
    (D) None of these

Short Answer Questions (15×2 = 30 Marks)

Answer the following questions briefly.

1. State what you mean by elasticity of a solid.

2. Why is it painful to walk barefoot on pebbles?

3. What is the main reason for the existence of different states of matter?

4. Define spring constant.

5. What is a hair spring?

6. What is the pressure in water at a depth of 10 meters?

7. Why do football and hockey boots have studs on their soles?

8. What is pressure in a liquid?

9. Write the equation of pressure in liquids.

10. How does pressure in a liquid change with depth?
11. What is the principle of buoyancy in liquids?
12. What is atmosphere?
13. Write an example which applies Pascal’s law.
14. How does a hydraulic press work?
15. Which law gives the operation of a hydraulic press?
    ____________________________________________________

Numerical & Detailed Answer Questions (Answer any 2) (2×5 = 10 Marks)

1. Write a note on atmospheric pressure and also discuss its variation with height.
   Answer:

2. Explain the concept of atmospheric pressure and its relationship with altitude.
   Answer:

3. A cylindrical water tank 2m deep has been built on the top of a building 20m high. What will be the pressure of water at the ground floor when the tank is full? Density of water is 1000 kg/m³. Take g = 10 m/s².
   Solution:

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