Question # 1

The appearance of colures in their film is due to

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Diffraction

Dispersion

Interference

Polarization

According to Huygen's principle

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Light bends round corners

Light travels in a straight line

All points on primary wave front are considered centre of distances

Light has wave nature

When a ray of light enters from rarer medium to a denser medium its wavelength.

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Increases

Decreases

Remain constant

Vanishes

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

Frequency less than 120 Hz are known as

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Infrasonic

Ultra sonics

Super sonics

Infrared

A fringe is a path of.

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Constant amplitude

Constant phase

Same wavelength

Constant frequency

Which technique uses underwater sound propagation to detect and locate submerged objects.

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RADAR

LIDAR

SONAR

LASER

For polarization , the direction of oscillation has to be perpendicular to the direction of travel sound waves are longitudinal waves so they cannot be.

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Reflected

Deflected

Diffracted

polarized

The energy content of a wave is proportional to its.

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Wave velocity

Wave velocity squared

Frequency

Amplitude squared

LASER is a device which can produce

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Monochromatic beam of light

Coherent beam of light

An intense beam of lgiht

All of these

Polarization of light shows that light is.

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Corpuscular in nature

Of extremely short waves

Longitudinal waves

Transverse waves

The length of piano wire is 1 m and mass is 20 g and it is stretched by a fore of 200 N the fundamental frequency of sound waves produced by the piano will be

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50 Hz

100 Hz

150 HZ

250 Hz

Ultra sonics are the

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Frequencies in the audible range

Frequencies greater than 20 Hz

Frequencies greater than 20 KHz

Frequency lower than 20 KHz

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

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N2

O2

CO2

H2

The dispersive power of a grating is

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Light used

Separation of lines

Frequency of light used

Independent of wavelength

A LASER beam may be used to measure very large distance because it is.

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Unidirectional

Coherent

Monochromatic

Massive

The energy transmitted per second though unit are held perpendicular to the direction of propagation of the wave is called.

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Intensity of sound

Pitch of sound

Loudness of sound

Quality of sound

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 ratio of the velocity of sound in hydrogen to the velocity of sound in oxygen is

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4:1

16:1

2:1

8:1

What is shapes of a pure note

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Sinwave

Sawtooth

Square wave

Triangular wave

Blue colour of sky is due to.

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Diffraction

Reflection

Polarization

Scattering

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