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