21)

Frictional force is

Class 11 Physics

A)

Both a and b

B)

Not a conservative force

C)

A conservative force

D)

None

22)

The reaction in which heat energy is released is called as

Class 11 Physics

A)

Both a and b

B)

Exothermic reaction

C)

Endothermic reaction

D)

None

23)

The reaction in which heat energy is absorbed is called as

Class 11 Physics

A)

Both a and b

B)

Exothermic reaction

C)

Endothermic reaction

D)

None

24)

The time rate at which work is done or energy is transferred is called as

Class 11 Physics

A)

Heat energy

B)

Work

C)

Force

D)

Power

25)

Power is the

Class 11 Physics

A)

Both a and b

B)

Scalar quantity

C)

Vector quantity

D)

None