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

Laws of reflection and refraction can also be explained by:

Question # 2

The least distance of distinct vision is:

Question # 3

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

Question # 4

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

Question # 5

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

Question # 6

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 7

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

Question # 8

In an interference pattern of Young's double slit(YDS) experiment:

Question # 9

Huygen's principles states that:

Question # 10

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

Question # 11

A convex lens acts as diverging lens when the object is placed:

Question # 12

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

Question # 13

Monochromatic light means waves of:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
2 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these
3 Resolving power in mth order diffraction for grating is given by:
A. R = N/m
B. R = m/N
C. R = N x m
D. None of these
4 The magnifier forms a virtual image of the object at:
A. None of these
B. Both A and B are correct
C. Much farther than the least distance
D. Least distance of distinct vision
5 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
6 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
7 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
8 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
9 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
A. Refraction
B. Reflection
C. Diffraction
D. Formation of spectrum
10 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line

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