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

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

Question # 2

Speed of light in vacuum depends upon:

Question # 3

A magnifier gives an image which is:

Question # 4

When a source of light isat very large distance,the shape of wavefront is:

Question # 5

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 # 6

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

Question # 7

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

Question # 8

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

Question # 9

Wave length of that color as compared to that of violet color is:

Question # 10

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

Question # 11

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

Question # 12

Huygen principle is used to determine:

Question # 13

Stars twinkle due to

Question # 14

The locus of all points in a medium having same phase of vibration is called

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 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
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 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
5 The size of the image is maximum when its distance from the magnifying glass is:
A. 0.10 m
B. 0.15 m
C. 0.20 m
D. 0.25 m
6 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
7 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
8 In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
A. Greater than
B. Equal to
C. Smaller than
D. None of these
9 A virtual image is formed when object is placed:
A. Within focal length of a convex lens
B. Near the focal point of a concave lens
C. Both A and B
D. Away from 2F of a convex lens
10 A line which represents the direction of travel of a wave is known as:
A. Spherical Wavefront
B. Locus
C. Ray
D. Either B or C

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