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

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## Q1. In which case work is not done:

(A) A girl swimming in a pond
(B) A windmill lifting water from a well
(C) A standing man holding a suit case in his hand
(D) A sail boat moving in the direction of wind

(A) 0°
(B) 45°
(C) 90°
(D) 180°

## Q3. Potential energy and kinetic energy are types of

(A) Electrical energy
(B) Magnetic energy
(C) Thermal energy
(D) Mechanical energy

## Q4. When a body falls freely towards the earth, then its total energy

(A) Decreases
(B) Increases
(C) First increases and then decreases
(D) Remains constant

## Q5. 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

## Q6. In the SI system, the unit of potential energy is

(A) newton
(B) joule
(C) watt
(D) metre per second

(A) 6 × 10³ J
(B) 6 J
(C) 0.6 J
(D) zero

## Q8. Mechanical energy of a body includes

(A) kinetic energy only
(B) potential energy only
(C) kinetic energy and potential energy
(D) none of these

## Q9. When a body falls freely towards the earth, then its total energy

(A) Decreases
(B) Increases
(C) First increases and then decreases
(D) Remains constant

## Q10. According to the law of conservation of energy

(A) Energy can’t be destroyed
(B) Energy can’t be created
(C) Energy can be transformed from one from to another
(D) All of the above

## Q11. Which of the following does not possess the ability to do work not because of motion ?

(A) a sparrow flying in the sky
(B) a sparrow moving slowly on the ground
(C) a sparrow in the nest on a tree
(D) a squirrel going up a tree

## Q12. One joule work is said to be done when

(A) a force of 1 N displaces a body by 1 cm
(B) a force of 1 N displaces a body by 1 m
(C) a force of 1 dyne displaces a body by 1 m
(D) a force of 1 dyne displaces a body by 1 cm.

## Q13. Which one of the following is not the unit of energy?

(A) Joule
(B) Newton meter
(C) Kilowatt
(D) Kilowatt hour

(A) 4 times
(B) 8 times
(C) 16 times
(D) 12 times

(A) 25
(B) 2.5
(C) 0.25
(D) 5

## Q16. Work done by a body is

(A) negative, positive or zero
(B) always positive
(C) always zero
(D) always negative

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