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

According to Huygen's principle

Question # 2

Electromagnetic waves transport:

Question # 3

The velocity of light in vacuum can be changed by changing

Question # 4

Wave length of that color as compared to that of violet color is:

Question # 5

The wave nature of light was proposed by:

Question # 6

A ray passing through optical center of a lens, after refraction:

Question # 7

A virtual image is formed when object is placed:

Question # 8

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

Question # 9

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

Question # 10

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

Question # 11

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

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

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 # 14

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

Question # 15

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 A line which represents the direction of travel of a wave is known as:
A. Spherical Wavefront
B. Locus
C. Ray
D. Either B or C
2 In an interference pattern of Young's double slit(YDS) experiment:
A. Bright fringesare wider than dark fringes
B. Dark fringes are wider than bright fringes
C. Both dark and bright fringes are of equal width
D.

Central fringes are wider than the outer fringes
3 In the formula R = N x m for diffraction grating, N denotes:
A. No. of lines/cm
B. No. of lines/meter
C. Total number of lines
D. None of above
4 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
5 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
6 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
7 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
8 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
9 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
10 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

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