Circular Motion(Physics)

1-One revolution is equal:

A. 57(degree)
B. 90(degree)
C. 180(degree)
D. 360(degree)

2-One radian is equal to:

A. 67.3(degree)
B. 57.3(degree)
C. 87.3(degree)
D. 60(degree)

3-The rate of change of angular displacement is called:

A. Angular displacement
B. Angular velocity
C. Angular acceleration
D. Torque

4-Revolution is a unit for:

A. Angular displacement
B. Angular velocity
C. Angular acceleration
D. Time

5-The angular acceleration is produced by:

A. Momentum
B. Torque
C. Pressure
D. Power

6-A particle is moving in a circle with constant speed. The direction of centripetal force will be:

A. Along the tangent
B. Along radius towards center
C. Along radius away from center
D. Changing with motion

7-Moment of inertia is equal to:(there 2 is the power of these)

A. m2r
B. m2r2
C. mr
D. mr2 

8-In case planets the necessary acceleration is provided by:

A.    Gravitational force
B. Frictional force
C. Coulomb force
D. Centripetal force

9-Centripital force performs:

A. Maximum work
B. Minimum work
C. Negative work
D. No work

10-The dimension of angular acceleration is:

A. T-1
B. T-2
C. T3
D. LT-2

11-The apparent weight of a man in a lift moving down with an acceleraion of 9.8ms-2 is:

A. Zero
B. 9.8 N
C. 19.6 N
D. Infinity

12-The minimum number of communication satellites required to cover the whole earth is:

A. 4
B. 3
C. 2
D. 5

13-Geo-stationary satellite completes one rotation around earth in:

A. 3 hours
B. 6 hours
C. 12 hours
D. 24 hours

14-If a body of mass of 20 kg is allowed to fall freely, its weight becomes:

A. zero
B. 98N
C. 9.8N
D. 10N

15-Which electromagnetic wave are used as medium in satellite communication system:

A. Microwaves
B. Radio waves
C. Infrared waves
D. Ultraviolet waves