Question # 1

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

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Dispersion

Interference

Reflection

Refraction

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

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

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Equal

Smaller

Greater

None of these

Huygen principle is used to determine

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Speed of light

Location of wavefront

About polarized and unpolarized light

None of them

Laws of reflection and refraction can also be explained by

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Particle nature of light

Quantum nature of light

Wave nature of light

Complex nature of light

When the source of light is at very large distance, the shape of wavefront is

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Spherical

Cylindrical

Plane

None of these

The terms phase difference and path difference are

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Same

Different

Equal

none of these

Angle between ray of light and the corresponding wavefront is

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0⁰

60⁰

90⁰

120⁰

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

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

The property of light which does not change with the nature of the medium is

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Frequency

Amplitude

Wavelength

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

Electromagnetic waves transport

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Energy only

Momentum only

Both A and B

None is correct

In case of destructive interference of two waves, the amplitude of the resultant wave will be __________ either of the waves.

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Greater than

Smaller than

Equal to

None of these

Monochromatic light means wave of

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Same frequency

Same colour

Same Wavelength

All of them

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Physics ECAT Pre Engineering Chapter 10 Optical Instruments Online Test MCQs With Answers

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