Question # 1

When the amplitude of a wave become double, its energy becomes

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One half

Two times

Three times

Four times

Who did give the correct formula for the speed of sound in air?

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Boyle

Laplace

Newton

Einstein

Which of the following is mechanical wave

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Heat

Light

Sound

None of these

If 30 waves per second pass through a medium at a speed 30 ms-1, then the wavelength is.

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30 m

15 m

1 m

28 m

The experimental value for the velocity of sound in air is

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233 m-sec^-1

333 m-sec^-1

433 m-sec^-1

533 m-sec^-1

The wavelength of fundamental note in one end closed pipe in term of length 'l' of pipe is.

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4 l

2l

l

1/4 l

In transverse waves the particles of medium vibrate

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Along the direction of wave

Opposite to direction of wave

Perpendicular to direction of wave

Slowly

The speed of sound in air does not depend upon

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Temperature

Pressure

Density

Medium

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

Velocity of sound is independent of

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Temperature

Density

Pressure

Medium

A set of frequencies which are multiples of the fundamental frequency are called.

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Doppler effect

Nodal frequencies

Beat frequencies

Hamonics

Teh speed of sound in air is 340 m/s. If the pressure of air is doubled then the speed becomes.

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Double

Half

Four times

Remains same

The distance between two consecutive crest is called.

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Displacement

Amplitude

Wave front

Wavelength

Half wavelength corresponds to

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0 ^o

90 ^o

180 ^o

360 ^o

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In order to produce beats, the two sound waves should have.

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The same amplitude

Slightly different amplitude

The same frequency

slightly different frequencies.

The speed of stars and galaxies can be calculated by

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Compton effect

Stefan's law

Doppler's effect

Pascal's law

When two identical travelling waves are superimposed, velocity of resultant wave.

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Decreases

Increases

Remain same

Becomes zero

A stationary waves is established din a string which vibrates in four segments at a frequency of 120 Hz, Its fundamental frequency is.

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15 Hz

30 HZ

60 Hz

480 Hz

When the amplitude of a wave is increase to doubled is energy.

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Remain the same

Increases 4 times

Increases by two times

Decreases by half

In stationary waves, the velocity of particle at the node is.

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Maximum

Infinite

Zero

Varible

In stationary waves, the particle velocity at nodes is

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Minimum

Maximum

Zero

Constant

In vibrating string, the points where the amplitude is maximum are called.

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Nodes

Antinodes

Troughs

Crests

The distance between two consecutive trough is called.

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Displacement

Amplitude

Wave length

Wave front

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