Question # 1

A large ripple tank with a vibrator working at a frequency of 30 Hz produce 25 complete waves in a distance of 50 cm. The velocity of the wave is.

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9.53 cm s-1

60 cm s-1

750 cm s-1

1500 cm s-1

In solid and liquids the variation of the speed of sound with temperature is.

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Much greater than in air

Slightly les than in air

The same as in air

Smell and usually negligible

Which of the following refers to the distance from crest to crest of a wave.

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Frequency

Wavelength

Amplitude

Period

A fringe is a path of.

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Constant amplitude

Constant phase

Same wavelength

Constant frequency

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

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Increases

Decreases

Remain unchanged

May increase or decrease

A water wave is an example of.

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Transverse wave

Longitudinal wave

Hair wave

Shock wave

The energy following per second through a unit area held perpendicular to the direction of wave is.

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The loudness of the sound waves

The pitch of the sound waves

The intensity level of sound waves

The intensity of sound waves

A point source of light is situated at large distance The nature of the wave front at the point will be.

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Cylindrical

Spherical

Plane

Ellipical

X-rays can cause

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Malaria

Dysentery

Cancer

Blood pressure

In the experiment of production of X rays the anti cathode should be bombarded with.

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A particles

Beta particles

Electrons

Protons

In case of stationary waves every particle of the medium has fixed

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Velocity

Displacement

Amplitude

Phase

Any frequency higher than the fundamental frequency of a sound is known as.

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Overtone

Beat

Acoustics

Shockwaves

A sheet of transparent material with fine equality spaced lines ruled parallel on its surface is called.

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Interferometer

Grating element

ruler

Patch

Two tuning forks of frequencies 260 Hz and 257 Hz are sounded together the number of beats produced per seconds is.

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1

3

4

257

We can hear beats when the difference in the frequencies of two sounding bodies is not more than.

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2

4

6

10

Plane polarized light can be produce dby

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Simple reflection

Double refrraction

Scattering of light

All of these

A wave reflected from the boundary of a denser medium will have phase change

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45 ^o

60^o

90 ^o

180 ^o

If in Young's double slit experiments the separation between two slits is halved then the fringe width

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Remains unchanged

Becomes double

Reduces to half

Becomes 3 times

In order to har an echo what is the minimum distance between the sound and reflecting surface.

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0.65 m

16.5 m

1.65 m

165 m

Which of the following represents an elastic wave.

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Light waves

Radiowaves

X-rays

Sound waves

The sound waves used sonography are

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Less than 20 KHz

of 20 Khz

Greater than 20 KHz

Of 20 MHz

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