ECAT Pre General Science Physics Chapter 9 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 9 Physical Optics

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ECAT Pre General Science Physics Chapter 9 Physical Optics

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Question # 1

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

Question # 2

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 # 3

To see the minor details of the object by microscope, it should have:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

Huygen's principles states that:

Question # 8

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

Question # 9

The terms phase difference and path difference are:

Question # 10

The velocity of light in vacuum can be changed by changing

Question # 11

Least distance of distinct vision of an old man possibly becomes:

Question # 12

Huygen principle is used to determine:

Question # 13

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

Question # 14

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

Question # 15

Light appears to travel in straight line because

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
2 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted
3 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
A. Greater, smaller
B. Smaller, smaller
C. Smaller, larger
D. Greater, larger
4 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
5 In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:
A. Greater than
B. Smaller than
C. Equal to
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 terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
9 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
10 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

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