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

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 # 2

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

Question # 3

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

Question # 4

If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:

Question # 5

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
2 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
3 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
4 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
5 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
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 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
8 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
9 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
10 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

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