The isothermal elasticity of a medium is Ei and the adiabatic elasticity in Ea. The velocity of sound in the medium is proportional to

1.  Ei  

2.  Ea 

3.  Ei  

4.  Ea

Subtopic:  Speed of Sound |
 60%
From NCERT
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When a wave is reflected from a denser medium the change in phase is :

1.  0

2.  π 

3.  2π 

4.  3π

Subtopic:  Wave Motion |
 72%
From NCERT
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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 |
From NCERT
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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 (OLD NCERT) |
 69%
From NCERT
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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 |
 81%
From NCERT
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The equation of a wave pulse travelling along x-axis is given by y=302+x-20t2, 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 |
 54%
From NCERT
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The equation of a standing wave in a string is y=200 msin2π50x cos2π0.01t 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 |
From NCERT
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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 |
 66%
From NCERT
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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 |
 59%
From NCERT
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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 |
From NCERT
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