Question # 1

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

Electromagnetic waves transport

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Energy only

Momentum only

Both A and B

None is correct

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

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 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 waves are

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Transverse waves

Longitudinal waves

Compressional

None of them wave

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 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

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

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Dispersion

Interference

Reflection

Refraction

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

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Smaller

Longer

Equal

None of these

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

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Spherical

Cylindrical

Plane

None of above

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

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ECAT Physics Chapter 10 Optical Instruments Online Test MCQs With Answers

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