Question # 1

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

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Smaller

Longer

Equal

None of these

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

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Dispersion

Interference

Reflection

Refraction

In case of point source of light, shape of wavefront is

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Spherical

Cylindrical

Plane

None of above

To observe interference of light, the condition, which must be met with is that the sources must be

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Monochromatic

Phase coherent

Both of above

None of above

Speed of light in vacuum depends upon

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Frequency

Wavelength

Amplitude

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

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

A line which represents the direction of travel of a wave is known as

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Spherical wavefront

Locus

Ray

Either B or C

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

The locus of all the points in the same phase of vibration is called

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Wave pocket

Wavefront

Wave number

None of these

Light has

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Wave nature

Dual nature

Particle nature

None of them

Light waves are

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Mechanical waves

Electromagnetic waves

Any of above

None of above

Huygen principle is used to determine

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Speed of light

Location of wavefront

About polarized and unpolarized light

None of them

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

The wave nature of light was proposed by

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Newton

Thomas Young

Huygen

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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ECAT Physics Chapter 10 Optical Instruments Online Test MCQs With Answers

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