Why do we hear the sound produced by the humming bees while the sound
of vibrations of pendulum is not heard?
A girl is sitting in the middle of a park of dimension 12 m × 12 m. On the
left side of it there is a building adjoining the park and on right side of the
park, there is a road adjoining the park. A sound is produced on the road
by a cracker. Is it possible for the girl to hear the echo of this sound?
Explain your answer.
Before playing the orchestra in a musical concert, a sitarist tries to adjust
the tension and pluck the string suitably. By doing so, he is adjusting
(a) intensity of sound only
(b) amplitude of sound only
(c) frequency of the sitar string with the frequency of other musical
instruments
(d) loudness of sound
Earthquake produces which kind of sound before the main shock wave begins
(a) ultrasound
(b) infrasound
(c) audible sound
(d) none of the above
When we change feeble sound to loud sound we increase its
(a) frequency
(b) amplitude
(c) velocity
(d) wavelength
Sound travels in air if
(a) particles of medium travel from one place to another
(b) there is no moisture in the atmosphere
(c) disturbance moves
(d) both particles as well as disturbance travel from one place to another.
In SONAR, we use
(a) ultrasonic waves
(b) infrasonic waves
(c) radio waves
(d) audible sound waves
A key of a mechanical piano struck gently and then struck again but much
harder this time. In the second case
(a) sound will be louder but pitch will not be different
(b) sound will be louder and pitch will also be higher
(c) sound will be louder but pitch will be lower
(d) both loudness and pitch will remain unaffected
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