Question # 1

The speed of sound was accurately measured in:

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1736

1737

1738

1739

the waves have properties:

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reflection

refraction

diffraction

all of these

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

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time period

cycle

frequency

amplitude

the unit of frequency is:

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hertz

vibration per second

cycle per second

all a, b and c

The intensity of lawn mover is:

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10^-1 wm^-2

10^-2wm^-2

10^-1wm^-3

10^-3wm^-2

the part of waves at which particles of the medium are below the normal position are called:

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extreme position

crest

trough

compression

Mathematical formula of sound level (in bel) is:

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S.L = 10 log I/Io (bel)

S.L = K log I/Io (bel)

S.L = Log I/Io (bel)

S.L = 10 log Io/I (bel)

The product of frequency and wavelength is equal to:

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Time period

Amplitude

Wave speed

Wave energy

The water waves obey the laws of:

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Reflection

Refraction

Diffraction

All of these

The oscillations of a system in the presence of which force are called damp oscillations:

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Resistive force

Attractive force

Coulomb force

Both a and b

For normal person audible frequency range for sound wave lies between.

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10 Hz and 10KHz

20 Hz and 20KHz

25 Hz and 25KHz

30 Hz and 30KHz

The speed of sound in air at 0 ^oC is:

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331 ms^-1

332 ms^-1

333 ms^-1

336 ms^-1

Time period is reciprocal of:

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Frequency

Cycle

Wave-length

Amplitude

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