<!--{C}%3C!%2D%2Dtd%20%7Bborder%3A%201px%20solid%20%23ccc%3B%7Dbr%20%7Bmso-data-placement%3Asame-cell%3B%7D%2D%2D%3E--> 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) |
68%
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 $y=\frac{30}{2+{\left(x-20t\right)}^{2}}$, 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 |
54%
From NCERT
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The equation of a standing wave in a string is  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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In the phenomenon of interference of sound by two coherent sources if difference of intensity at maxima to intensity at minima is 20dB, then the ratio of intensities of the two sources is

1.  $\frac{121}{81}$

2.  $\frac{11}{9}$

3.  $\frac{101}{99}$

4.  $\frac{10}{1}$

Subtopic:  Wave Motion |
52%
From NCERT
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When a sound wave travels from one medium to another, the quantity that remains unchanged is :

1.  speed

2.  amplitude

3.  frequency

4.  wavelength

Subtopic:  Wave Motion |
82%
From NCERT
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If a sound source of frequency n approaches an observer with velocity v/4 and the observer approaches the source with velocity v/5, then the apparent frequency heard will be-

1.  (5/8)n

2.  (8/5)n

3.  (7/5)n

4.  (5/7)n

Subtopic:  Doppler's Effect (OLD NCERT) |
82%
From NCERT
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