Force, Motion and Energy TNPSC Group 1 Questions

Force, Motion and Energy MCQ Questions

13.
The device employed to convert electrical energy into mechanical energy is
A.
Dynamo
B.
Motor
C.
Voltmeter
D.
Galvanometer
ANSWER :
B. Motor
14.
The velocity ratio of a screw jack is
A.
2πl/p
B.
2πpl
C.
2πp/l
D.
2π/pl
ANSWER :
A. 2πl/p
15.
The maximum displacement of a vibrating body from its mean position is called
A.
Gyratron
B.
Wavelength
C.
amplitude
D.
Impulse
ANSWER :
C. amplitude
16.
Speeds of bodies exceeeding the speed of sound are called
A.
Supersonic
B.
Ultrasonic
C.
Infrasonic
D.
Superfast
ANSWER :
A. Supersonic
17.
Velocity of a body is
A.
the change of its position
B.
the rate of change of its position
C.
the change of its position in a definite direction
D.
the rate of the change of its position in a definite direction
ANSWER :
D. the rate of the change of its position in a definite direction
18.

Consider the following points:

1. the acceleration is zero when the bob passes through the mean position

2. in each cycle the bob attains a given velocity twice

3. both acceleration and velocity of the bob are zero when it reached its extreme position during its oscillation

4. the amplitude of oscillation of the simple pendulum decreases with time

A.

1 and 2

B.

3 and 4

C.

1,2 and 4

D.

2, 3 and 4

ANSWER :

D. 2, 3 and 4