ECAT Pre Computer Science Chapter 9 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 9 Physical Optics

Try The MCQ's Test For ECAT Physics Chapter 9 Physical Optics

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ECAT Physics Chapter 9 Physical Optics

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Question # 1

Stars twinkle due to

Question # 2

The velocity of light in vacuum can be changed by changing

Question # 3

The distance from eye to near point is taken as:

Question # 4

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

Question # 5

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

Question # 6

The focal length of convex lens having magnifying power of 5.55 is:

Question # 7

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

Question # 8

In order to get interference using two light rays

Question # 9

Light has:

Question # 10

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

Question # 11

The least distance of distinct vision is:

Question # 12

The wave nature of light was proposed by:

Question # 13

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

Question # 14

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

Question # 15

The terms phase difference and path difference are:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
2 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
3 In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:
A. Greater than
B. Smaller than
C. Equal to
D. None of these
4 To see the minor details of the object by microscope, it should have:
A. High magnifying power
B. High resolving power
C. Am objective of larger focal length
D. None of these
5 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity
A. Fringe width will decrease
B. Fringe width will increase
C. Fringe width will remain unchanged
D. Fringe will become less intense
6 According to Huygen's principle
A. light travels in straight line
B. Light is a transvers wave
C. Light has dual nature
D. All points on the primary wave-front are the sources of secondary wavelets
7 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
8 The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called
A. Diffraction
B. Interference
C. Polarization
D. Dispersion
9 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
A. Gamma rays, micro waves, visible light
B. Radio waves, ultraviolet waves, X-rays
C. Ultraviolet rays, infrared rays, micro waves
D. Visible light, gamma rays, radio waves
10 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these

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