Question # 1

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

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Smaller

Longer

Equal

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

The terms phase difference and path difference are

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Same

Different

Equal

none of these

The wave nature of light was proposed by

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Newton

Thomas Young

Huygen

None of these

Angle between ray of light and the corresponding wavefront is

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0⁰

60⁰

90⁰

120⁰

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

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Dispersion

Interference

Reflection

Refraction

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

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

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

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

Light waves are

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Transverse waves

Longitudinal waves

Compressional

None of them wave

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

Light waves are

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Mechanical waves

Electromagnetic waves

Any of above

None of above

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

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Spherical

Cylindrical

Plane

None of above

Wavelength of light, on the average, is given by

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10^-14m

10^-10m

10^-6m

10^-4m

Speed of light in vacuum depends upon

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Frequency

Wavelength

Amplitude

None of these

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

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