# Class 9 Chapter 11 Work and Energy MCQs with Answers

## CBSE Class 9 Science Chapter 11 “Work and Energy MCQs with Answer keys

Work and Energy MCQs – Here is a compilation of Free MCQs (with answers) from Class 9 Science Book Chapter 11 Work and Energy.  Students can practice free MCQs as have been added by CBSE in the new Exam pattern. At the end of Multiple- Choice Questions, the answer key also has been provided for your reference.Also Take free Online MCQs Test for Class 9.

Q.1. Which is the renewable source of energy among the following.

(a) Sun

(b) Coal

(c) Natural gas

(d) Fossil fuels

Q.2. The energy of a body due to its motion is called  ____.

(a) gravitation energy

(b) static energy

(c) kinetic energy

(d) All of these

Q.3. What is the work done on a satellite by the Earth’s gravitational force?

(a) zero, because the force exerted by the Earth on the satellite is parallel to the displacement of the satellite.

(b) zero, because the force exerted by the Earth on the satellite is perpendicular to the displacement of the satellite.

(c) positive, because the force exerted by the Earth on the satellite is perpendicular to the displacement of the satellite.

(d) negative, because the force exerted by the Earth on the satellite is perpendicular to the displacement of the satellite.

Q.4. The momentum of a body is _________.

(a) directly proportional to velocity of the body, provided its mass remains constant.

(b) directly proportional to the mass of the body, provided its velocity remains constant.

(c) inversely proportional to the kinetic energy of the body

(d) Both (a) and (b)

Q.5. Identify from the following which is true about work?

(a) Unit of work is newton metre

(b) Its SI unit is Joule.

(c) It is a scalar quantity

(d) All of these

Q.6. If 20 N of force is applied on a body and the body is displaced by 2 m, then work done on the body is

(a) 5 J

(b) 40 J

(c)10 N

(d) 40 N

Q.7. The commercial unit of energy is________.

(a) watt

(b) kilowatt

(c) watt-hour

(d) kilowatt-hour

Q.8. _______ is the process in which two or more atomic nuclei join to form a single heavier nucleus.

(a) nuclear fission

(b) nuclear fusion

(c) any nuclear

(d) none of these

Q.9. Which of the following is NOT a stored form of energy?

(a) Chemical energy

(b) Gravitational potential energy

(c) Kinetic energy

(d) Elastic potential energy

Q10. If the force applied on a body displaces it in the opposite direction, then the work done on the body by the applied force is _______

(a) is negative.

(b) is positive.

(c) is zero.

(d) can be positive or zero.

Q.11. Power is defined as ____.

(a) work done per unit time

(b) mass per unit volume

(c) energy consumed per unit time

(d) Both (a) and (c)

Q.12. The ratio of change in the kinetic energy of a body to the time taken by the body for the change in energy is equal to the

(a) pressure applied by the body.
(b) work done on the body.

(c) energy stored in the body.

(d) power expended by the body

Q.13. A player transfers a momentum of 12 kg m/s to a ball of mass 400 g which is at rest. Find the work done on the ball.

(a) 180 J

(b) 345 J

(c) 400 J

(d) 427 J

Q.14. A body at rest at a certain height possesses which energy.

(a) kinetic

(b) gravitational potential

(c) elastic potential

(d) heat

Q.15. Person A reached the 2nd floor of a hospital by lift and person B reached the same floor by stairs. If both their masses are the same, then the ______.

(a) work done on A against the gravitational force is greater than that done on B

(b) work done on B against the gravitational force is greater than that done on A

(c) work done on them against the gravitational force is the same

1. d) power expended by both of them is the same

### Answer Key for Class 9 Science Chapter 11 Work and Energy MCQs

 Q. Ans Q. Ans 1 (a) 9 (c) 2 (c) 10 (a) 3 (b) 11 (d) 4 (d) 12 (d) 5 (a) 13 (a) 6 (b) 14 (b) 7 (d) 15 (c) 8 (b)