Work and Energy

CE

Chief Editor

Oct 12, 2022

Table of Contents

Practice Quiz Mode

Take all 11 MCQs in interactive quiz mode with timer and progress tracking

The work done will be zero when the angle between the force and the distance is

Difficulty: Easy

A:

45°C

B:

60°C

C:

90°C

D:

180°C

If the direction of motion of the force is perpendicular to the direction of motion of the body, then the work done will be

Difficulty: Easy

A:

Maximum

B:

Minimum

C:

Zero

D:

None of the above

If the velocity of the body becomes double, then its kinetic energy will

Difficulty: Easy

A:

Remain the same

B:

Become double

C:

Become four times

D:

Become half

The work done in lifting a brick of mass 2kg through a height of 5m above ground will be

Difficulty: Easy

A:

2.5 J

B:

10 J

C:

50 J

D:

100 J

The kinetic energy of a body of mass 2 kg is 25 J. Its speed is

Difficulty: Easy

A:

5 $ms^{-1}$

B:

12.5 $ms^{-1}$

C:

25 $ms^{-1}$

D:

50 $ms^{-1}$

Which one of the following converts lights energy into electrical energy?

Difficulty: Medium

A:

Electric bulb

B:

Electric generator

C:

Photocell

D:

Electric cell

When a body, is lifted through a height h, the work done on it appears in the form of its:

Difficulty: Medium

A:

Kinetic energy

B:

Potential energy

C:

Elastic potential energy

D:

Geothermal energy

The energy stored in coal is

Difficulty: Medium

A:

Heat energy

B:

Kinetic energy

C:

Chemical energy

D:

Nuclear energy

The energy stored in a dam is

Difficulty: Easy

A:

Electric energy

B:

Potential energy

C:

Kinetic energy

D:

Thermal energy

In Einstein's mass-energy equation, c is the

Difficulty: Medium

A:

Speed of sound

B:

Speed of light

C:

Speed of electron

D:

Speed of Earth

Rate of doing work is called

Difficulty: Easy

A:

Energy

B:

Torque

C:

Power

D:

Momentum