# NCERT Class-9 Science Solutions: Chapter 11-Work And Energy Part 1

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

Question 7:

The work done on an object does not depend upon the

1. Displacement

2. Force applied

3. Angle between force and displacement

4. Initial velocity of the object