Practice Questions with Answers - Multiple Choice Questions

# MCQ Questions for Class 9 Science Chapter 11 Work and Energy

## MCQ Questions for Class 9 Science Chapter 11 Work and Energy

Multiple Choice Questions

Question 1.
When a body falls freely towards the earth, then its total energy:
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases

Question 2.
In case of negative work, the angle between the force and displacement is:
(a) 0°
(b) 45°
(c) 90°
(d) 180°

Question 3.
Water stored in a dam possesses:
(a) no energy
(b) electrical energy
(c) kinetic energy
(d) potential energy

Question 4.
Which one of the following is not the unit of energy?
(a) Joule
(b) Newton meter
(c) Kilowatt
(d) Kilowatt hour

Question 5.
A body is falling from a height h, After it has fallen a height $$\frac{h}{2}$$, it will possess:
(a) only potential energy
(b) only kinetic energy
(c) half potential and half kinetic energy
(d) more kinetic and less potential energy

Answer: (c) half potential and half kinetic energy

Question 6.
The capacity of a body to perform work is called:
(a) Energy
(b) Work
(c) Power
(d) Heat

Question 7.
The rate of work done is called:
(a) Energy
(b) Power
(c) Capacity
(d) All of these

Question 8.
The capacity to perform work is obtained from :
(a) Food
(b) Energy
(c) Power
(d) All of these

Question 9.
An object of mass, m moving with velocity v has a kinetic energy of:
(a) $$\frac{1}{2} m v^{2}$$
(b) mgh
(c) $$\frac{2 m}{v^{2}}$$
(d) 2mv2

Answer: (a) $$\frac{1}{2} m v^{2}$$

Question 10.
The gravitational potential energy of an object of mass, m raised through a height, h from the earth’s surface is given by:
(a) $$\frac{1}{2}$$ mv2
(b) mgh
(c) $$\frac{1}{2}$$ mgh
(d) 2mgh