1. Kinetic energy of the bob of a simple pendulum is maximum
(a) At the mean position
(b) At the extreme left position
3(c) At the extreme right position
(d) None of these
2. If the mass of a pendulum is doubled, the time period
(a) Becomes double
(b) Becomes half
(c) Becomes 4 times
(d) Remains the same
3. The force which tries to bring the body back to its mean position is called
(a) Deforming force
(b) Restoring force
(c) Gravitational force
(d) Buoyant force
4. For a given length of a pendulum, the time period is maximum
(a) On the surface of the earth
(b) On the surface of the moon
(c) At the centre of the earth
(d) None of these
5. Sound waves are
(a) Transverse mechanical waves
(b) Longitudinal mechanical waves
(c) Neither (a) nor (b)
(d) None of these
6. Supersonic means
(a) Frequencies less than 20 Hz
(b) Same as ultrasonic
(c) Frequencies much more than that of ultrasonic's
(d) Same as infrasonics
7. Velocity of sound is maximum in
(a) Iron
(b) Mercury
(c) Water
(d) Air
8. The waves which propagate in metals are
(a) Longitudinal
(b) Transverse
(c) Both (a) and (b)
(d) Neither (a) nor (b)
9. Velocity of sound is minimum in
(a) Nitrogen
(b) Hydrogen
(c) Air
(d) Carbon dioxide
10. Echo is produced due to
(a) Reflection of sound
(b) Refraction of sound
(c) Resonance
(d) None of these
11. The echo will be heard if the original sound reflected by an obstacle reaches our ears after
(a) 10 s
(b) 5 s
(c) 1 s
(d) 0.1 s
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