set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

1 kilowatt hour is equal to

a) 36 joule

b) 100 joule

c) 1 joule

d) 3.6 × 10³ kilo joule

Question : 2

Assertion :
A man gets completely exhausted in trying to push a stationary wall.
Reason :
Work done by the man on the wall is zero.

a) If Assertion is correct but Reason is incorrect.

b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

c) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

d) If Assertion is incorrect but Reason is correct.

Question : 3

The energy of wind is

a) Electrical

b) Only kinetic

c) Only potential

d) Potential and kinetic both

Question : 4

As the train starts moving, the head of the passenger sitting inside leans backward because of

a) Moment of Inertia

b) Inertia of Motion

c) Inertia of Rest

d) Conservation of Mass

Question : 5

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?

a) length = 200 cm, diameter = 2 mm

b) length = 50 cm, diameter = 0.5 mm

c) length = 100 cm, diameter = 1 mm

d) length = 300 cm, diameter = 3 mm

Question : 6

The sum of the change in kinetic and potential energy is always

a) Negative

b) Positive

c) Zero

d) None of the above