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

Huygen's principles states that:

Question # 2

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

Question # 3

In an interference pattern of Young's double slit(YDS) experiment:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

Resolving power in mth order diffraction for grating is given by:

Question # 9

The distance from eye to near point is taken as:

Question # 10

If the object is situated at focus of a convex lens, then its image is formed at:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

A line which represents the direction of travel of a wave is known as:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
3 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
4 Which one of the following can act approximately as a source of monochromatic light;
A. Neon lamp
B. Fluorescent tube
C. Sodium lamp
D. None of these
5 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
6 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these
7 According to Huygen's principle
A. light travels in straight line
B. Light is a transvers wave
C. Light has dual nature
D. All points on the primary wave-front are the sources of secondary wavelets
8 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
9 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
10 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them

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