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

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

Question # 2

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

Question # 3

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

Question # 4

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

Question # 5

The wave nature of light was proposed by:

Question # 6

The cause of mirage observed in deserts in bright sunlight is due to

Question # 7

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

Question # 8

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 # 9

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

A ray passing through optical center of a lens, after refraction:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 The focal length of convex lens having magnifying power of 5.55 is:
A. 5.5 cm
B. 5 cm
C. 4.5 cm
D. 6 cm
3 The locus of all the points in the same phase of vibration is called:
A. Wave packet
B. Wave front
C. Wave number
D. None of them
4 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
5 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
6 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
7 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
8 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
9 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
10 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

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