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

The contrast in the fringes in an interference pattern depends upon

Question # 2

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

Question # 3

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Question # 4

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 # 5

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

Question # 6

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

Question # 7

Laws of reflection and refraction can also be explained by:

Question # 8

If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:

Question # 9

To sources are said to be coherent if they have:

Question # 10

Wave length of light, on the average, is given by:

Question # 11

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

Question # 12

The magnifier forms a virtual image of the object at:

Question # 13

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 # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
3 The image of the tip of a needle is never sharp because of
A. Polarization of light
B. Interference of light
C. Diffraction of light
D. Reflection of light
4 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
5 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
6 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
7 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
8 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
9 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
10 The magnifier forms a virtual image of the object at:
A. None of these
B. Least distance of distinct vision
C. Much farther than the least distance
D. Both A and B are correct

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