Physics Test | Class 9 Physics

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Class: 9th
Subject: Physics (SNC)
Chapter: 5 – Work, Energy, and Power

Test Date: Current Date
Time Allowed: 60 minutes
Total Marks: 40
Paper Type: Objective + Subjective

Multiple Choice Questions (10×1 = 10 Marks)

1. If a car doubles its speed, its kinetic energy will be:
   (A) the same
   (B) doubled
   (C) increased to three times
   (D) increased to four times
2. The work done will be zero when the angle between force and distance is:
   (A) ( 45^\circ )
   (B) ( 60^\circ )
   (C) ( 90^\circ )
   (D) ( 180^\circ )
3. Work done is a quantity:
   (A) Scalar
   (B) Vector
   (C) Both A and B
   (D) None of these
4. The energy of a body possessed by its motion is called:
   (A) Kinetic
   (B) Mechanical
   (C) Potential
   (D) Chemical
5. Formula of kinetic energy is:
   (A) K.E = mg
   (B) K.E = ½ mv²
   (C) K.E = w/t
   (D) K.E = mgh
6. What is the law of conservation of energy also known as?
   (A) First law of thermodynamics
   (B) Law of conservation of energy
   (C) Law of energy transformation
   (D) Second law of thermodynamics
7. What type of energy source is natural gas?
   (A) Non-renewable
   (B) Renewable
   (C) Fossil fuels
   (D) Nuclear
8. A machine takes 5s to lift a load of 100N through a height of 2m. What is its power?
   (A) 40W
   (B) 100W
   (C) 200W
   (D) 400W
9. What is the percentage of efficiency of a petrol engine?
   (A) 20%
   (B) 30%
   (C) 40%
   (D) 25%
10. The formula of efficiency is:
    (A) [ E = \frac{\text{output}}{\text{input}} \times 100 ]
    (B) [ E = \frac{\text{output}}{\text{input}} ]
    (C) [ E = \frac{\text{input}}{\text{output}} ]
    (D) None of these

Short Answer Questions (15×2 = 30 Marks)

Answer the following questions briefly.

1. Define work. Write its SI unit.

2. What is the condition for maximum work?

3. What is the work done by a force of 50N that moves an object 10m distance?

4. Define potential energy. Write its formula.

5. What is the law of conservation of energy?

6. Can energy be created or destroyed?

7. What is the total energy of an isolated system?

8. Can energy be converted from one form to another?

9. Give the names of renewable energy sources.

10. Why are non-renewable energy sources limited?
11. What is solar energy?
12. What is geothermal energy?
13. What is the main advantage of renewable energy sources?
14. Can a machine have 100% efficiency?
15. Write the percentage efficiency of an electric motor and a bicycle.
    ____________________________________________________

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

1. What is meant by kinetic energy? State its unit. Describe how it is determined.
   Answer:

2. Derive the formula for conservation of energy.
   Answer:

3. Describe the advantages and disadvantages of using solar energy as a renewable energy source.
   Answer:

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