Question # 1

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

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Decreases

Increases

Remain same

Becomes zero

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

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

In stationary waves, the particle velocity at nodes is

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Minimum

Maximum

Zero

Constant

the velocity of sound is maximum at 20 ^oC in

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Lead

Copper

Glass

Iron

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

The distance between the consecutive nodes is

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If the pressure of a gas is doubled, then speed of sound is.

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Doubled

Become half

Not affected

Increases by four times

The speed of sound is greater in solids due to their high.

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Density

Pressure

Temperature

Elasticity

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

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

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Doppler effect

Nodal frequencies

Beat frequencies

Hamonics

Half wavelength corresponds to

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0 ^o

90 ^o

180 ^o

360 ^o

The speed \velocity of sound is greatest in.

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Air

Steel

Ammonia

Water

In sonar we use

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Sound waves

Ultrasound waves

Microwaves

Radio waves

A bat finding its correct location by sending

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Matter waves

Ultrasonic waves

Infrasonic waves

electromagnetic waves

The distance covered by wave in 1 sec is

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wavelength

Wave number

Wave speed

Frequency

Longitudinal waves do not exhibit

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Reflection

Refraction

Polarization

Diffraction

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11th Class Part 1 Physics Chapter 8 Test Online MCQs With Answers

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