Question # 1

In the formula for finding the speed of waves in the spring, unit of m in SIn units is:

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kg

kg-meter

kg/meter

Meter/kg

A body is executing free vibrations when it oscilates

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with the interference of an external force

without the interference of an external force

with the interference of an internal force

none of them

The velocity of sound in air depends upon

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Density and elasticity of gas

Pressure

Wavelength

Amplitude and frequency of sound

Fidelity refers to

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Reproduction of original sound

Reproduction of original image

Reproduction of music

Reproduction of a CD from original copy

Waves transport energy

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without transport energy

with matter

both of them

none of them

The vibrations of factory floor caused by the running of heavy machinery is an example of

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free vibration

natural vibrations

forced vibrations

all of them

The temperature at which the speed of sound becomes double as was at 27°C is

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273°C

0°C

927°C

1027°C

An object undergoes S.H.M has maximum acceleration when its displacement form the means position

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maximum

zero

half of the maximum value

one third of the maximum value

Which of the following is/are example/s if mechanical waves i.e. waves generated in _______:

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Rope

Coil of spring

Water

All of them

SI unit of wave length is:

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Kilometer

Metre

Centimetre

Hertz

The velocity of sound is greatest in

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Water

Air

Vacuum

Metal

When a body is performing S.H.M., its acceleration is

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inversely proportional to the displacement

directly proportional to the applied force

directly proportional to the amplitude

directly proportional to the displacement but in opposite direction

The expression of Hook's law is

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F=ma

F=kx

F= -kx

-kx=ma

transverse wave motion is possible in:

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Air

A mixture of NH₃and O₂

Strings

All of these

Data transmitted along glass-fiber cables is in the form of pulses of monochromatic red light each of duration 2.5 ns. Which of the following is the best estimate of the number of wavelength in each pulse?

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10³

10⁶

10⁹

10¹²

The time required to complete on vibration is called

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frequency

total time

time period

velocity

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