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

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

Question # 2

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

Question # 3

Light waves are:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

In order to get interference using two light rays

Question # 8

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

Question # 9

A virtual image is formed when object is placed:

Question # 10

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 # 11

In case of point, source of light shape of wavefront is:

Question # 12

The locus of all the points in the same phase of vibration is called:

Question # 13

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

Question # 14

A prism splits a beam of white light into seven component colors. This is so because

Question # 15

With age, least distance of distinct vision:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
2 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
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 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
5 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
6 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
7 The distance from eye to near point is taken as:
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
8 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
9 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
A. Gamma rays, micro waves, visible light
B. Radio waves, ultraviolet waves, X-rays
C. Ultraviolet rays, infrared rays, micro waves
D. Visible light, gamma rays, radio waves
10 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

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