Question # 1

SI unit of wave length is:

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Kilometer

Metre

Centimetre

Hertz

When a body is pulled away from its rest or equilibrium position and then released, the body oscillates due to

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applied force

momentum

restoring force

none of them

When a mass 'm' is pulled slowly, the spring stretches by an amount x_o, then the work done will be

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W=Kx_o

W=1/2Kx_o

W=1/2Kx²_o

W=4Kx_o

If we increase the length of a simple pendulum four times, its time period will become

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2 times

3 times

4 times

6 times

In case of mechanical waves, we study the motion of

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a single particle

collection of particle

any one of them

none 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

Which type of wave can be set up in solids

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longitudinal waves

transverse waves

both of them

none of them

transverse wave motion is possible in:

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Air

A mixture of NH₃and O₂

Strings

All of these

For production of beats the two sources must have

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Different frequencies and same amplitude

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same phase

The velocity of sound at same temperature is maximum in

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H₂

N₂

O₂

NH₃

Smaller the damping, greater will be the

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frequency

wavelength

amplitude

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 distance covered by the wave in one second is:

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Wave number

Wave length

Frequency

Wave speed

Wave disturbances may also come in a concentrated bundle, like shock wave from an aeroplane flying at

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subsonic speed

sonic speed

super sonic speed

any one of them

If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

Shock absorber of the car is an example of

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resonance

forced oscillations

interference

damped oscillations

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