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21. |
The number of beats produced per second is equal to |
A. |
the sum of the frequencies of two tuning forks |
B. |
the difference of the frequencies of two tuning forks |
C. |
the ratio of the frequencies of two tuning forks |
D. |
the frequency of either of the two tuning forks |
Answer: Option B
Explanation:
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22. |
Beats are the results of |
A. |
diffraction of sound waves |
B. |
constructive and destructive interference |
C. |
polarization |
D. |
destructive interference |
Answer: Option B
Explanation:
|
23. |
Silence zone takes place due to |
A. |
constructive interference |
B. |
destructive interference |
C. |
beats |
D. |
resonance |
Answer: Option B
Explanation:
|
24. |
Doppler effect applies to |
A. |
sound wave only |
B. |
light wave only |
C. |
both sound and light waves |
D. |
neither sound nor light wave |
Answer: Option C
Explanation:
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25. |
When the source of sound moves away form a stationary listener then _________ occurs. |
A. |
an apparent increase in frequency |
B. |
an apparent decrease in frequency |
C. |
an apparent decrease in wavelength |
D. |
no apparent change in frequency |
Answer: Option B
Explanation:
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26. |
A simple pendulum has a bob of mass m and its frequency is f. If we replaced the bob with a heavier one say of 2m then that will be its new frequency? |
A. |
1/4f |
B. |
1/2f |
C. |
frequency lower than 20 Hz |
D. |
2f |
Answer: Option C
Explanation:
|
27. |
Which one is the correct relation for fundamental frequency of open and closed pipe? |
A. |
fopen = 2 fclosed |
B. |
fclosed = 2fopen |
C. |
fopen = fclosed |
D. |
fopen = 1 / f closed |
Answer: Option A
Explanation:
|
28. |
In open organ pipe |
A. |
only even harmonics are present |
B. |
only odd harmonics are present |
C. |
both even and odd harmonics are present |
D. |
selected harmonics are present |
Answer: Option C
Explanation:
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29. |
Which one is the correct relation? |
A. |
VNewton = V Laplace |
B. |
VNewton = |
C. |
VNewton = |
D. |
VNewton = |
Answer: Option C
Explanation:
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30. |
The dimension of elastic modulus ? is |
A. |
ML-1T-2 |
B. |
ML-2T-2 |
C. |
MLT-2 |
D. |
ML2T-2 |
Answer: Option A
Explanation:
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