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

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

Question # 2

Huygen's theory cannot explain

Question # 3

According to Huygen's principle

Question # 4

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

Question # 5

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 # 6

Light appears to travel in straight line because

Question # 7

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

Question # 8

A magnifier gives an image which is:

Question # 9

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

Question # 10

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Question # 11

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

Question # 12

Huygen principle is used to determine:

Question # 13

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

Question # 14

Laws of reflection and refraction can also be explained by:

Question # 15

Speed of light in vacuum depends upon:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
2 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
3 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
4 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
5 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
A. Gamma rays, micro waves, visible light
B. Radio waves, ultraviolet waves, X-rays
C. Ultraviolet rays, infrared rays, micro waves
D. Visible light, gamma rays, radio waves
6 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
7 In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.
A. Bright
B. Dark
C. Any of A and B
D. None of these
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 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
10 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct

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