Question # 1

Sound wave do not travel in vacuum because.

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they are transverse waves

They are stationary waves

They require material medium for propagation

They do not have enough energy

When wind blows in the same direction in which the sound travels, the sound velocity

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Decreases

Increases

Remains unchanged

Becomes zero

A girl standing 150 m in front of tall building fires a pistol A boy standing 350 m behind her hears two bangs 1 s apart from this information what is the speed of sound in air.

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150 m s-1

300 m s-1

280 m s-1

330 m s-1

The locus of all points in the same state of vibrations are known as.

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half period zone

A wavefront

A half wave zone

A full wave zone

Tuning fork is a source of.

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Heat

Energy

Light

Sound

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

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N2

O2

CO2

H2

What is the emission of light by a substance that has observed light or others electromagnetic radiations of a difference wavelength.

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Fluorescence

Illuminance

Luminance

Incandescence

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

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

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

Frequency less than 120 Hz are known as

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Infrasonic

Ultra sonics

Super sonics

Infrared

Plane polarized light can be produced by

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Reflection

Refraction

Scattering of light

All of these

interference and diffraction of light support the

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Wave nature of light

Transverse nature of light waves

Quantum nature of light

Electromagnetic nature of light

Which effect produce ultrasonic is quartz.

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Pyroelectric effect

Piezoelectric effect

Hall effect

Magnetostriction effect

Newton's rings are experimentally derived from the phenomenon of.

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Polarization of light

Resolution of light

Interference of light

Diffraction of light

Two light waves which are not coherent cannot produce.

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Interference

Diffraction

Reflection

Dispersion

The wave phenomenon that classifies light as a transverse wave is.

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Polarization

Diffraction

Interference

Refraction

Light waves can be polarized because they

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have short wavelength

Have high frequency

Can be reflected

Are transverse

When a transverse wave is reflected on going from a more dense to a less dense medium.

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There is no phase shift

There is a 180 ^o phase shift

There is a phase shift of 360 ^o

A crest is transformed to a trough

Beats are the results of.

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Diffraction of sound waves

Interference

Polarization

Timber

Infrared radiation is also known as

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Radio signals

Heat radiation

Magnetic resonance waves

RADAR

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