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91
More density of the particles in the medium through which sound travels, creates more . . . . . . . . and vice versa.
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Answer & Solution
Answer: Option B
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92
A source of wave produces 20 crests and 20 troughs in 0.4 seconds. Find the frequency of the wave:
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Answer: Option D
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93
The time period of a simple pendulum made by using a thin copper wire of length L is T. Suppose the temperature of the room in which this simple pendulum is placed increases by 30°C. What will be the effect on the time period of the pendulum?
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Answer: Option A
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94
What is the approximate value of speed of sound in air?
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Answer: Option B
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95
Which of the following statements is correct about sound waves and light waves?
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Answer: Option D
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96
Which one of the following statements is correct? The velocity of sound
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Answer: Option D
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97
There is an acoustic resonance, which echoes is the fixed resonance when it is in vibration.
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Answer: Option B
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98
What are the main instruments in a SONAR, which are used to find the distance, direction and speed of an underwater body?
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Answer: Option C
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99
Which one of the following is not true for an electromagnetic wave?
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Answer: Option C
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100
The speed of sound . . . . . . . . as it passes from solid to gaseous medium?
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Answer: Option D
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