Question # 1

The profile of periodic waves generated by a source executing S.H.M is represented by a.

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Circle

Sine curve

Tangent curve

Cosine curve

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

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One half

Two times

Three times

Four times

Crests and trough are formed in.

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Longitudinal waves

transverse waves

Stationary waves

Compression waves

The speed of sound increases with the increase of in

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Pressure

Volume

Temperature

Density

The speed \velocity of sound is greatest in.

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Air

Steel

Ammonia

Water

10 waves pass through a point in 2 seconds with speed 10 ms-1 the frequency of wave will be

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1 Hz

2 Hz

5 Hz

10 Hz

The apparent change in the pitch of sound due to relative motion is called.

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Carnot theorem

Interference

Doppler effect

Beats

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

the example of mechanical waves is

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Water waves

Infrared waves

Radio waves

Ultraviolet waves

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

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

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Density

Pressure

Temperature

Elasticity

If 20 waves passes through he medium in 2 sec of 10 ms-1 then he wavelength is.

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200 m

2 m

1 m

0.5 m

Radar system is an application of.

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Chemical effect

Electric effect

Magnetic effect

Doppler's effect

The speed of sound in ari at 0 ^oC is 332 ms-1, Then the speed at 40 ^oC will be

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372 ms-1

356 ms-1

346 ms-1

332 ms-1

Star moving towards the earth show

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Red shift

Blue shift

Green shift

Yellow shift

the velocity of sound is maximum at 20 ^oC in

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Lead

Copper

Glass

Iron

In which medium the speed of sound is greater.

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Oxygen

Air

Water

copper

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

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