# Class 9 Science Chapter 11 Work and Energy MCQ Questions with Answer

Work and Energy Class 9 MCQ is one of the best strategies to prepare for the CBSE Class 9 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more Work and Energy class 9 MCQ which will help them all through their board test.

## Work and Energy Class 9 MCQ Questions with Answer

Class 9 Science MCQ with answers are given here to Chapter 11 Work and Energy. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 9 Science syllabus. By Solving these Class 9 MCQs, you will be able to analyze all of the concepts quickly in the Chapter and get ready for the Class 9 Annual exam.

Learn Work and Energy Class 9 MCQ with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 9 Work and Energy MCQ with answers given below.

Question 1. A child on a skateboard is moving at a speed of 2 m/s. After a force acts on the child, her speed is 3 m/s. What can you say about the work done by the external force on the child?
(a) Zero work was done
(b) negative work was done
(c) positive work was done
(d) Infinite work was done

C

Question 2. Mike applied 10 N of force over 3 m in 10 seconds. Joe applied the same force over the same distance in 1 minute. Who did more work?
(a) Mike
(b) both did zero work
(c) both did the same work
(d) Joe

C

Question 3. Work done by tension in the string when a ball tied to a string is being whirled around in a circle is
(a) tension does no work at all
(b) tension does negative work
(c) tension does positive work
(d) tension does zero work

A

Question 4. The value of 1KWH is
(a) 3.6 X 106 J
(b) 3.6 X 105J
(c) 3.6 X 107 J
(d) 3.6 X 109 J

A

Question 5. Water stored in a dam posseses:
(a) No energy
(b) potential energy
(c) kinetic energy
(d) electrical energy

B

Question 6. When a body falls freely towards the earth then the total energy
(a) remains constant
(b) increase
(c) decrease
(d) first increases and then decreases

A

Question 7. Power of a woman is equal to:
(a) work /time
(b) work /time x work
(c) work x time
(d) time/work

A

Question 8. A spring is compresse The P.E of the compressed spring
(a) increase
(b) becomes zero
(c) remains unchanged
(d) decrease

D

Question 9. The potential energy of a girl is maximum
(a) standing
(b) sleeping on the ground
(c) sitting on the ground
(d) sitting on the ground

A

Question 10. 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

C

Question 11. In the SI system, the unit of potential energy is
(a) newton
(b) joule
(c) watt
(d) metre per second

B

Question 12. Work done by centripetal force is
(a) >0
(b) ≥0
(c) <0
(d) 0

D

Question 13. When force acts in opposite direction the work done is
(a) negative
(b) Positive
(c) infinity
(d) Zero

A

Question 14. When a spring is compressed work is done on it. Its elastic potential energy
(a) increases
(b) Decreases
(c) Disappears
(d) Does not change

B

Question 15. When a body rolls down an inclined plane, then it has
(a) It has no energy
(b) Only Kinetic energy
(c) It has potential energy
(d) Both kinetic and potential energy

D

Whoever needs to take the CBSE Class 9 Board Exam should look at this MCQ. To the Students who will show up in CBSE Class 9 Science Board Exams, It is suggested to practice more and more questions. Aside from the sample paper you more likely had solved. These Work and Energy Class 9 MCQ are ready by the subject specialists themselves.

Question 16. On a rough surface a mass is ((a) pulled,((b) pushed by a force acting at an angle with the surface.
(a) Pulling is easier
(b) Pushing is easier
(c) Pushing and pulling both are easier
(d) Pushing and pulling g are not easier

A

Question 17 . A stone rubbed on a rough surface and placed on the skin will show heating sensation, because
(a) Friction causes heat
(b) Heat cannot flow from the skin to
(c) Heat flows from the stone to skin
(d) Heat cannot flow

A

Question 18 . Work done by a body from Force-distance curve is
(a) Area under the curve
(b) Slope of the curve
(c) Line parallel to the distance axis
(d) Line parallel to the Force axis

A

Question 19. A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 ms²)
(a) 6 × 10³ J
(b) 6 J
(c) 0.6 J
(d) zero

D

Question 20. Work done by a body is
(a) negative, positive or zero
(b) always positive
(c) always zero
(d) always negative

A

Question 21 . A rocket rises up in the air due to the force generated by the fuel. The work done by the:
(a) fuel is negative work and that of force of gravity is positive work
(b) fuel is positive work and that of force of gravity is negative work
(c) both fuel and force of gravity do positive work
(d) both fuel and force of gravity do negative work

B

Question 22. What is the commercial unit of energy?
(a) electron volt
(b) W/s
(c) kW h
(d) joule

C

Question 23. When a body like earth is moving in a circular path the work done in that case is zero because:
(a) Centripetal force acts in the direction of motion of the body
(b) Centripetal force acts along the radius of circular path
(c) Gravitational force acts along the radius of circular path
(d) Centrifugal force acts perpendicular to the radius of circular path

B

Question 24 . 9800 joule of energy was spent to raise a mass of 50kg, the mass was raised to a height of
(a) 20m
(b) 980m
(c) 10m
(d) none of these

A

Question 25 . SI unit of power is
(a) watt
(b) joule
(c) newton
(d) metre

A

Question 26 . Work done by the gravitational force of earth on a satellite along a circular path is
(a) O
(b) minimum
(c) max
(d) all of these

A

Question 27 . A body is falling from a height h. After it has fallen to a height of h/2, it will possess:
(a) Only kinetic energy
(b) Half kinetic and half potential energy
(c) Only potential energy
(d) More kinetic and less potential energy

D

Question 28. When speed of the moving object is doubled its
(a) Acceleration is doubled
(b) Momentum becomes four times more
(c) K E. is increased to four times
(d) Potential energy is increased

C

Question 29. A body is falling from a height h. After it has fallen a height 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

C

Question 30. If speed of a car becomes 2 times, its kinetic energy becomes
(a) 4 times
(b) 8 times
(c) 16 times
(d) 12 times

A

Question 31 . The form of energy possessed by a flying bird is:
(a) Kinetic energy
(b) Potential energy
(c) Both kinetic and potential energy
(d) Can’t say

C

Question 32. A ball is dropped from a height of 10 m.
(a) Its potential energy increases and kinetic energy decreases during the falls
(b) Its potential energy is equal to the kinetic energy during the fall.
(c) The potential energy decreases and the kinetic energy increases during the fall.
(d) The potential energy is ‘O’ and kinetic energy is maximum while it is falling.

C

Question 33. The work done is ‘0’ if

(a) The body shows displacement in the opposite direction of the force applied.
(b) The body shows displacement in the same direction as that of the force applied.
(c) The body shows a displacement in perpendicular direction to the force applied.
(d) The body masses obliquely to the direction of the force applied.

B

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