Question # 1

Longitudinal waves cannot be

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Reflected

Difracted

Dispersed

Polarized

If the wave length of a wire is 1 cm and its period is 0.02 s, the velocity of the wave will be

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20 cm s-1

50 cm s-1

60 cm s-1

100 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

The phenomenon of beats takes place due to

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Longitudinal waves

Transverse waves

Stationary waves

Both a and b

Which of the following is a method of energy transfer.

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Conduction

Wave motion

Radiation

All of these

With which factor disputative power of a grating increases.

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Order of spectrum

Number of lines per centimeter

Order and number of lines per centimeter

Shape of the grating

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

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0 ^o

60 ^o

90 ^o

180 ^o

Which of the following factor will not affect the speed of sound i a medium.

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Temperature

Pressure

Humidity

Mass

A water wave is an example of

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Electromagnetic wave

Longitudinal wave

Transverse wave

Reverberation

Which of the following is an example of continuous spectra.

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Black body radiation spectrum

Molecular spectra

Atomic spectra

grating spectrum

If Young's experiment is performed in water. which of the following change will occur.

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Fringe width will increases

Fringe width will decreases

Fringe width will remain unchanged

No fringe will be seen

The maximum displacement from the undisturbed position of the medium to the crest top is called.

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Wavelength

Amplitude

Period

Frequency

Light waves can be polarized because they

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have short wavelength

Have high frequency

Can be reflected

Are transverse

The spectrum of radiation due to transitions between energy levels in an atom, other absorption or emission is called.

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Atomic spectrum

Molecular spectrum

Grating spectrum

Normal specturm

The phase velocity is the velocity of a point that moves with a wave at constant phase it is also called.

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Phase speed

Wave speed

Wave velocity

All of these

In which of the following the speed of sound will be maximum under similar conditions.

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N2

O2

CO2

H2

The loudness of a sound depends on its

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Wavelength

Frequency

Wave amplitude

Regularity

Two waves of the same frequency and amplitude travelling in opposites directions along the same path in the same medium produce.

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Stationary waves

Transverse wave

Longitudinal waves

Compressional waves

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

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Interferometer

Grating element

Ruler

Patch

Reverberation is the

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Presence of large number of overtones

presence of harsh and discordant notes

Presence of ultrasonic vibrations

Persistence of audible sound after the source has stopped

When the source and observer are moving away from each other the apparent pitch will

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Increases

Decreases

Be zero

Be infinite

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