# NCERT Class-9 Science Solutions: Chapter 11-Work and Energy Part 1 (For CBSE, ICSE, IAS, NET, NRA 2023)

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Multiple Choice Questions

Question 1:

When a body falls freely towards the earth, then its total energy

1. Increases
2. Decreases
3. Remains constant
4. First increases and then decreases

Question 2:

A car is accelerated on a levelled road and attains a velocity of its initial velocity. In this process the potential energy of the car

1. Does not change
2. Becomes twice to that of initial
3. Becomes 4 times that of initial
4. Becomes 16 times that of initial

Question 3:

In case of negative work the angle between the force and displacement is

Question 4:

An iron sphere of mass has the same diameter as an aluminum sphere of mass is . Both spheres are dropped simultaneously from a tower. When they are above the ground, they have the same

1. Acceleration
2. Momenta
3. Potential energy
4. Kinetic energy

Question 5:

A girl is carrying a school bag of mass on her back and moves on a levelled road. The work done against the gravitational force will be

Question 6:

Which one of the following is not the unit of energy?

1. Joule
2. Kilowatt-hour
3. Newton meter
4. kilowatt