ECAT Pre Engineering Physics Chapter 9 MCQ Test With Answer

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

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Question # 1

Frequency of red color as compared to that of violet color is:

Question # 2

To sources are said to be coherent if they have:

Question # 3

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

Light waves are:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
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 A prism splits a beam of white light into seven component colors. This is so because
A. Phase of different colors is different
B. Amplitude of different colors is different
C. Wavelength of different colors is different
D. Velocity of different colors is different
4 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted
5 Light appears to travel in straight line because
A. It is not absorbed by the atmosphere
B. It is refracted by the atmosphere
C. Its wavelength is very small
D. Its velocity is very large
6 Least distance of distinct vision of an old man possibly becomes:
A. A little less than 25 cm
B. A little more than 25 cm
C. Much less than 25 cm
D. None of these
7 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
8 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
9 To sources are said to be coherent if they have:
A. Same amplitude
B. Same wavelength
C. Definite phase relation with each other
D. None of them
10 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them

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