Question # 1

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

The polarization of an electromagnetic wave is determined by

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The magnetic field

The electric field

The electric and magnetic fields

The field direction of propagation of electromagnetic waves

The wavelength of Pascha series lies is the

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Visible region

Ultraviolet region

Infrared region

Invisible region

When transvers wave travelling in a less dense medium is reflected at an interface will a more dense medium.

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A trough becomes a crest

There is no phase shift

There is phase shift of 360 ^o

A crest remains a crest

If the period of a wave motion is 2 s and the wave speed is 4 cm s-1 then its frequency is

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1/8 C s-1

1/2 C s-1

2 C s-1

8 C s-1

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

We get light inside a room in a day time due to

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Interferences

Polarization

Diffraction

Refraction

What is the change in path when sound wave is reflected from a rigid support.

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Lamda /2

Lamda

2 lamda

Zero

Fringe spacing in double slit experiment can be increased by decreasing.

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Wavelength of light

Width of slits

Slite separation

Distance between the slits and screen

The phenomenon of interference comes about because waves obey

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the impulse momentum theorem

An inverse square law of intensity

The principle of reciprocity

The principle of super position

The addition of two or more waves is termed as

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Interferences

Period

Echo

Polarization

The dispersive power of a grating is

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Light used

Separation of lines

Frequency of light used

Independent of wavelength

A pendulum vibrates with a time period of 1 s which range of sound is produced by it

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Audible

Infrasonic

Ultrasonci

Super sonic

Intensity of the dark bands in interference pattern becomes zero when two waves.

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Of light are monochromatic

Are of the same frequency

Are of the same amplitude

Travel in opposite direction

Two sources of sound are said to be in resonance when.

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They look like similar

They produce sound of same frequency

They are enacted by the same agent

They differ from each other

During a thunderstorm, an observer sees a lighting flash Six second later he hears the thunder The speed of sound is 330 m s-1. Approximately how far away is the observer from the lighting.

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1/2 km

1/3 km

2 km

1/20 km

Which characteristics successively increases in the musical scale.

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Pitch

Quality

Loudness

Amplitude

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

The amplitude of a vibrating body at resonance place in vacuum is.

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zero

Maximum

Minimum

Infinite

What will be the frequency it an employ vessel is filled with water.

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Increases

Decreases

Remain unchanged

Fundamental

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