Question # 1

In which medium the speed of sound is greater.

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Oxygen

Air

Water

copper

Stationary waves are generated on a string of high l, if tension is increased , frequency of vibration will

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Decrease

Unchanged

Half

Increases

When two waves having same frequency traveling in same direction combine, phenomenon is called

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Wave motion

Combination of waves

Interference

Diffraction

If the wave motion is 0.01 sec and wave speed is 100 ms-1 then frequency of wave is.

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0.5 Hz

1 Hz

10 Hz

100 Hz

Sound wave can not be

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Reflected

Refracted

Diffracted

Polarized

Increase in speed of sound for 1 ^oC rise in temperature is.

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0.61 ms-1

0.61 cms-1

61 ms-1

6.1 ms-1

Radar system is an application of.

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Chemical effect

Electric effect

Magnetic effect

Doppler's effect

The speed of sound increases with the increase of in

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Pressure

Volume

Temperature

Density

When two identical waves superimposed, which can change.

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Wave length

Frequency

Velocity

Amplitude

On loading the prong of a tuning fork with wax, the frequency of sound.

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Increases

Decreases

Remains same

First increases then decrease

The distance between two consecutive trough is called.

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Displacement

Amplitude

Wave length

Wave front

Stars moving away from Earth show a

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Green shift

Blue shift

Red shift

Yellow shift

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 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

The distance covered by wave in 1 sec is

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wavelength

Wave number

Wave speed

Frequency

the velocity of sound at 0 ^oC is 332 ms-1, the velocity of sound at 10 ^oC will be

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337.1 ms-1

338.1 ,ms-1

342.1 ms-1

328.1 ms-1

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

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Physics Fsc Part 1 Chapter 8 Online Test MCQs With Answers

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