set 5 MCQ Questions & Answers Detailed Explanation

Question : 1

The potential energy of a freely falling object decreases progressively.

a) Sum of Potential Energy and Kinetic Energy at any point during the free fall remains constant

b) Potential energy gets converted into kinetic energy progressively

c) The law of conservation of energy is violated

d) Both (a) and (b)

Question : 2

An electrical appliance of 500 W is used for 5 hours per day. Energy consumed in 30 days will be

a) 75 kW h

b) 25 kW h

c) 2.5 kW h

d) None of these

Question : 3

A car is moving on a road and rain is falling vertically. Select the correct answer.

a) The rain will strike both the screens

b) The rain will strike the front screen only

c) The rain will strike the wind screen only

d) The rain will not strike any of the screens

Question : 4

In wind power, which form of energy is converted into electrical energy?

a) Solar energy

b) Potential energy

c) Kinetic energy

d) Radiant energy

Question : 5

Consider the following statements :

1. Copernicus discovered that the earth moves around the sun.
2. An astronaut cannot use a straw to sip a drink on the surface of the moon.
3. The S.I. unit of weight is kilogram.

a) 2 and 3

b) 1 and 2

c) 1 and 3

d) 1, 2 and 3

Question : 6

If a light body and a heavy body have equal momentum, then

a) the kinetic energy of the lighter body is equal to the kinetic energy of the heavier body

b) the lighter body has lesser kinetic energy than the heavier body

c) the lighter body has greater energy than the heavier body

d) the kinetic energy of both the bodies are independent of momentum.