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31. |
The particles in the wave separated through __________ multiple of ? are out of phase to each other |
A. |
(n) |
B. |
(n+1) |
C. |
(n+1/2) |
D. |
both (a) and (c) |
Answer: Option C
Explanation:
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32. |
Waves produced at the surface of water by a pencil executing vibrating motion if held vertically at a frequency of 50Hz are |
A. |
Longitudinal |
B. |
Transverse |
C. |
Periodic |
D. |
both (a) and (c) |
Answer: Option D
Explanation:
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33. |
Newton estimated the speed of sound |
A. |
281m/sec |
B. |
333m/sec |
C. |
340m/sec |
D. |
all of the above |
Answer: Option A
Explanation:
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34. |
Laplace found that the alternate compressions and rarefactions produced in sound waves follows |
A. |
isothermal law |
B. |
adiabatic law |
C. |
isochoric law |
D. |
all of the above |
Answer: Option B
Explanation:
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35. |
For destructive interference of sound waves the path difference between two interfering sounds should be |
A. |
n? |
B. |
(n+1/2)? |
C. |
some time n? and some times (n+1/2)? |
D. |
none of these |
Answer: Option B
Explanation:
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36. |
The speed of sound in hydrogen is __________ time than that in oxygen |
A. |
Two times |
B. |
Three times |
C. |
Four time |
D. |
Six time |
Answer: Option C
Explanation:
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37. |
The beats frequency (sensible) for a human car is |
Answer: Option B
Explanation:
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38. |
The speed of stationary waves in a stretched string are independent of |
A. |
Number of loops |
B. |
Tension in the string |
C. |
Point where string is plucked |
D. |
both (a) and (c) |
Answer: Option D
Explanation:
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39. |
Fundamental frequency of stationary waves in open pipe is ________ times the frequency in closed pipe. |
A. |
One |
B. |
Two |
C. |
Four time |
D. |
None of these |
Answer: Option B
Explanation:
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40. |
Which phenomena can be applied to estimate the velocity of star with respect to earth |
A. |
Dopplers effect |
B. |
Interference of waves |
C. |
Beats phenomena |
D. |
All of these |
Answer: Option A
Explanation:
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