Question # 1

To hear echoes, the minimum distance of the obstacle from source of sound should be:

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10 m

15 m

17 m

20 m

Diffraction of wave can be observed clearly only when the size of slit or obstacle is nearly ………. To the wavelength of the wave:

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Two times

Equal

Four times

Half

the number of waves passing through a point in one second is called:

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time period

cycle

frequency

amplitude

After how much time the echo must be heard?

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0.1 s

0.10 s

0.20 s

0.50 s

Which component is output device of computer:

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CPU

C.D

Keyboard

Monitor

High pitch means:

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High wavelength

High frequency

High time period

High energy

The speed of sound in the air at one atmospheric pressure at room temperature is:

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343 ms-1

346 ms-1

349 ms-1

339 ms-1

The loudness of sound is most closely related to its:

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Freqeucy

Period

Wavelength

Amplitude

Which form of energy is sound?

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Electrical

Mechanical

Thermal

Chemical

The product of frequency and wavelength is equal to:

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Time period

Amplitude

Wave speed

Wave energy

Coaxial cable are used to transmit signals:

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Magnet

Electric

Mechanical

Both mechanical and magnet

The sound waves are the example of:

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Longitudinal waves

Transverse waves

Electromagnetic waves

x-rays

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