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

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

Question # 2

In order to get interference using two light rays

Question # 3

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

Question # 4

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

Question # 5

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

Question # 6

Light has:

Question # 7

The locus of all the points in the same phase of vibration is called:

Question # 8

Electromagnetic waves transport:

Question # 9

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

Question # 10

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

Question # 11

The size of the image is maximum when its distance from the magnifying glass is:

Question # 12

Laws of reflection and refraction can also be explained by:

Question # 13

Huygen principle is used to determine:

Question # 14

The velocity of light in vacuum can be changed by changing

Question # 15

The contrast in the fringes in an interference pattern depends upon

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
3 A prism splits a beam of white light into seven component colors. This is so because
A. Phase of different colors is different
B. Amplitude of different colors is different
C. Wavelength of different colors is different
D. Velocity of different colors is different
4 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
5 Least distance of distinct vision of an old man possibly becomes:
A. A little less than 25 cm
B. A little more than 25 cm
C. Much less than 25 cm
D. None of these
6 Laws of reflection and refraction can also be explained by:
A. Particle nature of light
B. Quantum nature of light
C. Wave nature of light
D. Complex nature of light
7 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
8 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity
A. Fringe width will decrease
B. Fringe width will increase
C. Fringe width will remain unchanged
D. Fringe will become less intense
9 To see the minor details of the object by microscope, it should have:
A. High magnifying power
B. High resolving power
C. Am objective of larger focal length
D. None of these
10 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:
A. 5 cm
B. 20 cm
C. 10 cm
D. 15 cm

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