Question # 1

Interference through thin films depends upon

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Thickness of thin film

Nature of material of thin film

angle of incident light

All of the above

To produce beats it is necessary to use two waves.

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Travelling in opposite direction

Of slightly different frequencies

Of equal wavelengths

Of equal amplitudes

A water wave is an example of

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Electromagnetic wave

Longitudinal wave

Transverse wave

Reverberation

the amplitude of a wave indicates

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Wavelength

Frequency

Intensity of wave

Nature of wave

Diffraction is the property according to which light waves.

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Change their direction on entering a different medium

Produce chemical effects

Bend round the corners

Bend towards the centre

The perceived fundamental frequency of a sound is called.

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Pitch

Timber

Loudness

Wavelength

Light of passing through a polaroid is

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Plane polarized

Unpolarized

Circularly polarized

Elliptically polarized

The closed end of an organ pipe having longitudinal stationary waves in it behaves as

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Antinode

Source of waves

Node

Antinode

Which term best describes the nature of light from modern view point.

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Waves

Rays

Particles

Photons

The interference between two sounds of slightly differed frequency is

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shock wave

Beats

Sonic boom

Doppler's effect

Maximum number of orders available with a grating is.

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Independent of grating element

Directly proportional to grating element

Inversely proportional to grating element

Directly proportional to wavelength

The ratio of intensities of two sound waves is 4 : 9 what will be the ratio of their amplitudes.

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9:4

2:3

3:2

4:9

A wave source of frequency 1,000 Hz emits waves of wavelength 0.1 m How long does it take for the waves to travel 2500 m.

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4 s

25 s

40 s

100 s

A wave that consists of oscillations occurring perpendicular to the direction of energy transfer is called.

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Transvers wave

Longitudinal wave

Stationary wave

Shock wave

When white light is incident on a diffraction grating, the light that will eb deviated from central image will be.

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White

Yellow

Red

Blue

The fundamental frequency of a sound source is 256 Hz. What is the frequency of the first harmonic.

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64

128

256

512

A plane of polarization is one in which

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vibrations take place

No vibrations take place

Longitudinal vibrations take place

Transverse vibrations take place

If a rope in a hand makes 10 oscillations after every 2 s. the frequency of the wave is.

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2 C s-1

5 C s-1

10 C s-1

20 C s-1

Which are different types of emission spectrum

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Continues spectrum

Line spectrum

Band spectrum

all of the above

Polarized sunglasses decrease glare on a sunny day because they

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Completely absorb light

Block a portion of light

Have a special colour

refract light

Hygen's principle states that

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Light travels in straight line

Light travels in electromagetic waves

All points of primary wave front are source of secondary wavelets

Light has dual nature

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