Question # 1

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

Which component is output device of computer:

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CPU

C.D

Keyboard

Monitor

The unit of intensity of sound:

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wm^-1

wm

wm^-2

wm^-3

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

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time period

cycle

frequency

amplitude

The waves which travel in straight line through space and have strong signals are called:

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Micro waves

Mechanical waves

Light waves

Magnet waves

The product of frequency and wavelength is equal to:

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Time period

Amplitude

Wave speed

Wave energy

the unit of frequency is:

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hertz

vibration per second

cycle per second

all a, b and c

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

Astronauts is space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space.

Sound waves travel very fast in speace

Sound waves cannot travel in space

Sound waves have low frequency in space

The example of shock absorber of the vehicles are:

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Simple harmonic motion

Vibratory motion

Damped motion

Linear motion

Time period is reciprocal of:

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Frequency

Cycle

Wave-length

Amplitude

At extreme position potential energy of the pendulum is:

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Maximum

Minimum

Both a and b

Zero

The unit of spring constant is:

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m

kg

Nm²

Nm^-1

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