# The isothermal elasticity of a medium is ${\mathrm{E}}_{\mathrm{i}}$ and the adiabatic elasticity in ${\mathrm{E}}_{\mathrm{a}}$. The velocity of sound in the medium is proportional to 1.   2.   3.   4.  $\sqrt{{\mathrm{E}}_{\mathrm{a}}}$

Subtopic:  Speed of Sound |
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When a wave is reflected from a denser medium the change in phase is :

1.  0

2.

3.

4.  $3\mathrm{\pi }$

Subtopic:  Wave Motion |
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In a stationary wave along a string, the strain is :
1.  zero at the antinodes

2.  maximum at the antinodes

3.  zero at the nodes

4.  maximum at the nodes

Subtopic:  Standing Waves |
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A source of sound moves away with the velocity of sound from a stationary observer. The frequency of the sound heard by the observer:

1. remains the same

2. is doubled

3. is halved

4. becomes infinity

Subtopic:  Doppler's Effect |
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The longitudinal waves can travel :

1.  only in liquids

2.  only in solids

3.  only in gases

4.  In liquids, solids, and gases

Subtopic:  Types of Waves |
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The equation of a wave pulse travelling along x-axis is given by $y=\frac{30}{2+{\left(x-20t\right)}^{2}}$, x and y are in meters and t is in seconds. The amplitude of the wave pulse is

1.  5 m

2.  20 m

3.  15 m

4.  30 m

Subtopic:  Wave Motion |
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The equation of a standing wave in a string is $\mathrm{y}=\left(200\mathrm{m}\right)\mathrm{sin}\frac{2\mathrm{\pi }}{50}\mathrm{xcos}\frac{2\mathrm{\pi }}{0.01}\mathrm{t}$ where x is in meters and t is in seconds. At the position of antinode, how many times does the distance of a string particle become 200 m from its mean position in one second?

1.  100 times

2.  50 times

3.  200 times

4.  400 times

Subtopic:  Standing Waves |
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Eleven tuning forks are arranged in increasing order of frequency in such a way that any two consecutive tuning forks produce 4 beats per second. The highest frequency is twice that of the lowest. The highest and the lowest frequencies (in Hz) are, respectively:

1.  100 and 50

2.  44 and 22

3.  80 and 40

4.  72 and 30

Subtopic:  Beats |
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Consecutive frequencies emitted from an organ pipe are 75Hz, 125Hz, 175Hz.  The frequency of the tenth overtone will be:

1.  275 Hz

2.  175 Hz

3.  525 Hz

4.  575 Hz

Subtopic:  Standing Waves |
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The sound intensity level at a point 10 m away from a point source is 20dB, then the sound level at a distance 1m from the same source would be

(1) 40 dB

(2) 30 dB

(3) 200 dB

(4) 100 dB

Subtopic:  Wave Motion |
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