Class 9 chapter 2 Work and Energy

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1) In case of negative work the angle between the force and displacement is

2 points

a) 0°

b) 45°

c) 90°

d) 180°

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2) 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)

2 points

(a) 6 × 10³ J

(b) 6 J

(d) zero

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3) Which one of the following is not the unit of energy?

2 points

(a) Joule

(b) Newton metre

(d) Kilowatt per hour

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4) The work done on an object does not depend upon ---

2 points

(a) displacement

(b) force applied

(d) initial velocity of the object

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(5) Joule is the unit of ………………

2 points

a. Force

b. Work

c. Power

d. Charge

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6) The number of joules contained in 1 kWh is

2 points

(a) 36 × 10⁵J

(b) 3.6 × 10⁶ J

(d) 3.7 × 10⁷ J

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7) What are the various factors affecting kinetic energy?

2 points

a. Mass

b. Momentum

c. Velocity

d. All the above

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8) How much time will be required to perform 520 J of work at the rate of 20 W?

2 points

(a) 24s

(b) 16s

(d) 26 s

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9) The momentum of a body is _________.

2 points

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

b) Inversely proportional to the kinetic energy of the body

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

Both (a) and (c)

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10) A Objects in motion possess energy and can do work; this energy is called————

2 points

a) Solar energy

(b)Thermal energy

(d) Kinetic Energy

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