Physics GK · all questions

Sounds waves and Motion
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Q121

The sound produced by a single frequency is called . . . . . . . .

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Q122

A radio station broadcast at 30 metre band. The frequency of the carrier wave transmitted by this station is

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Q123

A sound wave produced 40 crests and 40 troughs in 0.3 seconds. Find the frequency of the wave.

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Q124

The velocity of sound in air is affected by change in the
1. Moisture content of air.
2. Temperature of air.
3. Composition of air.
4. Atmospheric pressure.
Choose the correct answer.

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Q125

We hear other's speaking to us from adjacent rooms due to . . . . . . . . of sound waves.

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Q126

Which of the following statements is true / false about the speed of sound in different mediums at 25°C?
A. In helium gas, the speed of sound is 965 km/s.
B. In hydrogen gas, the speed of sound is 1284 m/s.

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Q127

Which type of electromagnetic radiation is used in the remote control of a television?

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Q128

A pendulum clock is lifted to a height where the gravitational acceleration has a certain value of g. Another pendulum clock of same length, but of double the mass of the bob is lifted to another height where the gravitational acceleration is

\frac{g}{2}

. The time period of the second pendulum would be (in terms of period T of the first pendulum)

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Q129

Which of the following are false. Sound waves are . . . . . . . . waves.

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Q130

Which of the following electromagnetic wave has the shortest wavelength?

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Q131

Compression and rarefaction are due to variability of:

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Q132

Soundcan transmit from . . . . . . . .

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Q133

For a wave, wavelength divided by the time period is equal to

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Q134

Which of the following statements are true/false about the speed of sound in different mediums at 25°C?
A. In water (sea), the speed of sound is 1531 m/s.
B. In air, the speed of sound is 346 km/s.

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Q135

Which of the following is used to detect cracks and flaws in metal blocks?

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Q136

What is a single frequency sound called?

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Q137

If any explosion takes place at the bottom of a lake, what type of shock wave in water will take place?

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Q138

Find the speed of sound in air.

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Q139

A particle is moving in a circle with uniform speed. Its motion is

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Q140

Which of the following represents the distance travelled by a wave in one second?

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