Question # 1

Speed of light in vacuum depends upon

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Frequency

Wavelength

Amplitude

None of these

Electromagnetic waves transport

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Energy only

Momentum only

Both A and B

None is correct

Light waves are

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Mechanical waves

Electromagnetic waves

Any of above

None of above

The terms phase difference and path difference are

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Same

Different

Equal

none of these

The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself

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Equal to

Greater than

Smaller than

None of these

In an interference pattern of Young's Double Slit (YDS) experiment

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Bright fringes are wider than dark fringes

Dark fringes are wider than bright fringes

Both dark and bright fringes are of equal width

Central fringes are wider than the outer fringes

The appearance of colours in the soap (or oil) film results from

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Dispersion

Interference

Reflection

Refraction

In YDS experiment, fringe spacing means the distance between two consecutive _________ fringes

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Bright

Dark

Any of A or B

None of these

Huygen's principle states that

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Light travels in straight line

Light has dual nature

Either of these

None of these

Wavelength of light, on the average, is given by

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10^-14m

10^-10m

10^-6m

10^-4m

Huygen principle is used to determine

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Speed of light

Location of wavefront

About polarized and unpolarized light

None of them

In case of constructive interference of two waves, the amplitude of the resultant wave is __________ either of the waves

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Greater than

Equal to

Smaller than

None of these

Two sources are said to be coherent if they have

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Same amplitude

Same wavelength

Definite phase relation with each other

None of them

Frequency of red colour as compared to that of violet colour is

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Equal

Smaller

Greater

None of these

Which one of the followings can act approximately as a source of monochromatic light

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

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ECAT Physics Chapter 10 Optical Instruments Online Test MCQs With Answers

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