11)

The rotational analogue of force in linear motion is

Class 11 Physics

A)

Couple

B)

Torque

C)

Moment of force

D)

All

12)

The time rate of the total angular momentum of a system of particles about a point is equal to ______ acting on the system taken about the point.

Class 11 Physics

A)

Sum of external torques

B)

Sum of external momentum

C)

Sum of external force

D)

None

13)

If the total external torque on a system of particles is zero then

Class 11 Physics

A)

Both a and b

B)

Total angular momentum of the system is conserved

C)

Total linear momentum of the system is conserved

D)

None

14)

If dL/dt = 0 then

Class 11 Physics

A)

F is constant

B)

L is constant

C)

P is constant

D)

W is constant

15)

A rigid body is said to be in mechanical equilibrium if both _______ are not changing with time.

Class 11 Physics

A)

Both a and b

B)

Angular momentum

C)

Linear momentum

D)

None

16)

If the total force on the body is zero then the total _______ of the body does not change with _____.

Class 11 Physics

A)

Both a and b

B)

Linear momentum, time

C)

Angular momentum, time

D)

None

17)

If the total torque on the rigid body is zero then the total ______ of the body does not change with ____.

Class 11 Physics

A)

Both a and b

B)

Angular momentum, time

C)

Linear momentum, time

D)

None

18)

The sum of the components of the torque along any axis perpendicular to the plane of the forces must be

Class 11 Physics

A)

Both a and b

B)

Zero

C)

Unity

D)

None

19)

A pair of forces of equal magnitude but acting opposite directions with different lines of actions is known as

Class 11 Physics

A)

Both a and b

B)

Torque

C)

Couple

D)

None

20)

An ideal rigid body is the body with a

Class 11 Physics

A)

Both a and b

B)

Perfectly definite and unchanging shape

C)

Imperfect shape

D)

None