# 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 Image the Moon Toward the Earth Image the moon toward the earth

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 Gravity Equation Free Fall Acceleration of Body Gravity equation free fall acceleration of body

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 Work Done Against the Gravitational Force Work done against the gravitational force

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