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

In the formula R = N x m for diffraction grating, N denotes:

Question # 2

The image of the tip of a needle is never sharp because of

Question # 3

The property of light which does not change with the nature of the medium is:

Question # 4

For the virtual image, option _______ is not correct:

Question # 5

The ratio of the size of the image to that of object is called:

Question # 6

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

Question # 7

Angle between the ray of light and the corresponding wavefront is:

Question # 8

With age, least distance of distinct vision:

Question # 9

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

Question # 10

Huygen's principles states that:

Question # 11

Speed of light in vacuum depends upon:

Question # 12

If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:

Question # 13

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

Question # 14

The contrast in the fringes in an interference pattern depends upon

Question # 15

Conventionally, all the distance p, q, f are measured from _____ of the lens:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 To sources are said to be coherent if they have:
A. Same amplitude
B. Same wavelength
C. Definite phase relation with each other
D. None of them
2 The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
A. Equal to
B. Greater than
C. Smaller than
D. None of these
3 In order to get interference using two light rays
A. The sources should be monochromatic and coherent
B. The sources should have the same frequency
C. Superposition should be linear
D. All of these
4 If the object is situated at focus of a convex lens, then its image is formed at:
A. F
B. 2F
C. Infinity
D. None of these
5 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
6 In the formula R = N x m for diffraction grating, N denotes:
A. No. of lines/cm
B. No. of lines/meter
C. Total number of lines
D. None of above
7 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
8 In an interference pattern of Young's double slit(YDS) experiment:
A. Bright fringesare wider than dark fringes
B. Dark fringes are wider than bright fringes
C. Both dark and bright fringes are of equal width
D.

Central fringes are wider than the outer fringes
9 Light appears to travel in straight line because
A. It is not absorbed by the atmosphere
B. It is refracted by the atmosphere
C. Its wavelength is very small
D. Its velocity is very large
10 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m

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