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

When a source of light isat very large distance,the shape of wavefront 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

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

Question # 4

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

Question # 5

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

Question # 6

The appearance of the colour in the soap (oil) film results from:

Question # 7

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

Question # 8

Light appears to travel in straight line because

Question # 9

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

Question # 10

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

Question # 11

The ratio of the size of the image to that of object is called:

Question # 12

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

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

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

Question # 15

For the virtual image, option _______ is not correct:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
3 For the virtual image, option _______ is not correct:
A. 1/p = 1/f -1/q
B. 1/f = 1/p -1/q
C. 1/p=1/p-1/f
D. 1/p=1/f+1/q
4 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
5 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
6 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
7 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
8 Stars twinkle due to
A. The fact that they do not emit light continuously
B. The refractive index of earth's atmosphere fluctuates
C. The Star's atmosphere absorbs its light intermittently
D. None of these
9 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
10 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these

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