Question # 1

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

If there is no extension in the spring then the position is called:

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Equilibrium position

unequilibrium

neutral equilibrium

stable equilibrium

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

If the intensity of faintest audible sound is Io and of another sound is I then sound level will be:

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K log Io/I

Log Io/I 2K

K log Io/I2

K log I/Io

1 KB = :

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1024 bytes

1024 KB

1024MB

None of these

The unit of intensity of sound:

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wm^-1

wm

wm^-2

wm^-3

Which form of energy is sound?

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Electrical

Mechanical

Thermal

Chemical

The speed of sound is air at 21 ^oC is:

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336 ms^-1

343 ms^-1

430 ms^-1

470 ms^-1

The force applied on the mass attached with a spring is represented by:

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f_a

f_c

f_ext

f_s

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

When a body moves to and fro about a point, its motion is called:

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Random motion

Vibratory motion

Linear motion

Rotatory motion

If the displacement in spring is ‘x’ of mass “m” attached with a spring then restoring force is:

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F=ma

F=kx

F=-kx

F= m/a

the distance between two consecutive trough or crest is called:

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wavelength

frequency

time period

amplitude

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