# MCQ Class 9 Science Chapter 11 Work and Energy

Please refer to the MCQ Questions for Class 9 Science Chapter 11 Work and Energy. The following Work and Energy Class 9 Science MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 9. Our experts have designed MCQ Questions for Class 9 Science with Answers for all chapters in your NCERT Class 9 Science book.

## Work and Energy Class 9 MCQ Questions with Answers

See below Work and Energy Class 9 Science MCQ Questions, solve the questions and compare your answers with the solutions provided below.

Question. 1 kWh is equivalent to
a. 3.67 x 107 J
b. 3.6 x 106 J
c. 3.69 x 109 J
d. 6.67 x 107 J

B

Question. How much energy does a 100 W electric bulb transfer in 1 minute?
a. 100 J
b. 600 J
c. 3600 J
d. 6000 J

C

Question. One horse power is equivalent to
a. 649 W
b. 734 W
c. 746 W
d. 745 W

C

Question. An electric bulb rated 100 W is said to consume energy in 10 hours is
a. 1 kWh.
b. 10 kWh.
c. 100 Wh.
d. 0.01 kWh.

A

Question. When the angle between the direction of force and the direction of displacement is an acute angle, the nature of work done is
a. positive.
b. negative.
c. either positive or negative.
d. zero.

A

Question. If force and displacement in the direction of force are doubled, then the work done would be
a. doubled.
b. halved.
c. 4 times.
d. ¼ times.

C

Question. A boy weighing 200 N climbs a vertical ladder. If the value of g be 10 m s–2, the work done by the boy in climbing 2 m height will be
a. 200 J.
b. 20 J.
c. 100 J.
d. 400 J.

D

Question. The momentum of a bullet of mass 20 g fired from a gun is 10 kg m/s. The kinetic energy of this bullet in kJ will be
a. 1.5
b. 2
c. 2.5
d. 3

C

Question. If the velocity of a moving body is doubled, its kinetic energy becomes
a. one-fourth.
b. four times.
c. halved.
d. zero.

B

Question. When an object falls freely towards the earth, then its total energy
a. increases.
b. decreases.
c. remains constant.
d. first increases then decreases.

C

Question. The work done on an object does not depend on the
a. displacement.
b. force applied.
c. angle between force and displacement.
d. initial velocity of the object.

D

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

B

Question. The commercial unit of energy is
a. watt.
b. watt-hour.
c. kilowatt.
d. kilowatt-hour.

D

Question. A stretched spring possesses
a. kinetic energy.
b. potential energy.
c. electrical energy.
d. magnetic energy.

B

Question. Amount of work done in compressing or stretching the spring against its elasticity is
a. kinetic energy.
b. potential energy.
c. elastic potential energy.
d. heat energy.

C

Question. Which is a vector quantity?
a. Work
b. Energy
c. Power
d. Force

D

Question. When the angle between the direction of force and the direction of displacement is 90o, then the amount of work done is
a. negative.
b. positive.
c. zero.
d. cannot be determined.

C

Question. A man carries a suitcase in his hand and climbs up the stairs. The work done by the man is
a. negative.
b. positive.
c. zero.
d. none of these.

B

Question. A body rolls down on an inclined plane, it has
a. potential energy.
b. kinetic energy.
c. kinetic and potential energy both.
d. neither kinetic energy nor potential energy.

C

Question. When the momentum of a body is increased by 100 %, its kinetic energy increases by
a. 50 %
b. 100 %
c. 200 %
d. 300 %

D

Question. An electric motor converts electrical into
a. chemical energy.
b. heat energy.
c. mechanical energy.
d. light energy.

C

Question. On reaching the extreme positions the bob of a pendulum possesses only
a. potential energy.
b. kinetic energy.
c. chemical energy.
d. heat energy.

A

Question. The potential energy of a body of mass 1 kg kept at a height of 5 m, if acceleration due to gravity is 10 m/s2.
a. 25 J
b. 30 J
c. 50 J
d. 100 J

C

Question. The kinetic energy of a body of mass 2 kg moving with a velocity of 0.1 m/s is
a. 0.1 J
b. 0.01 J
c. 0.001 J
d. 0.02 J

B

Question. The flowing water has kinetic energy which can be used to turn blades in dams to generate .
a. heat energy
b. hydraulic energy
c. electrical energy
d. mechanical energy

C

Question. A man has four options to move a body through a height. In which case is maximum work done?
a. Push over an inclined plane.
b. Lift vertically upwards
c. Push over smooth rollers
d. Push on a plane horizontal surface

B

Question. An electric cell is a source of
a. heat energy.
b. light energy.
c. electrical energy.
d. sound energy.

C

Question. The work done by a weight of 1 kg mass when it moves up through 1 m is
a. 10 J
b. –10 J
c. 0.1 J
d. –0.1 J

B

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