Question # 1

Huygen principle is used to determine:

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Speed of light

Location of wavefront

About polarized or unpolarized light

None of them

The cause of mirage observed in deserts in bright sunlight is due to

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Refraction of light

Reflection of light

Scattering of light

Total internal reflection of light

The contrast in the fringes in an interference pattern depends upon

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Fringe width

Relative difference intensities of the two sources

Distance between the slits

Wavelength

A magnifier gives an image which is:

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Virtual, inverted

Real, erect

Virtual, erect

Real, inverted

A grating with high resolving power can distinguish _______ difference in wavelengths :

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Smaller

Larger

Zero

None of these

The appearance of the colour in the soap (oil) film results from:

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Dispersion

Interference

Reflection

Refraction

When the object lies between F and 2F, the image formed by is formed at:

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Real

Virtual

Diminished

Erect

If the object is situated at focus of a convex lens, then its image is formed at:

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F

2F

Infinity

None of these

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

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Wave packet

Wave front

Wave number

None of them

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

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

Stars twinkle due to

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The fact that they do not emit light continuously

The refractive index of earth's atmosphere fluctuates

The Star's atmosphere absorbs its light intermittently

None of these

The distance from eye to near point is taken as:

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10 cm

15 cm

20 cm

25 cm

The least distance of distinct vision is:

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10 cm

25 cm

50 cm

100 cm

The magnifier forms a virtual image of the object at:

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Least distance of distinct vision

Much farther than the least distance

Both A and B are correct

None of these

Frequency of red color as compared to that of violet color is:

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Equal

Smaller

Greater

None of these

Light has:

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Wave nature

Particle nature

Dual nature

None of these

To see the minor details of the object by microscope, it should have:

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High magnifying power

High resolving power

Am objective of larger focal length

None of these

Resolving power in mth order diffraction for grating is given by:

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R = N/m

R = m/N

R = N x m

None of these

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ECAT Pre General Science Physics Chapter 9 Physical Optics Online Test MCQs With Answers

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