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

The terms phase difference and path difference are:

Question # 3

If the object is situated at focus of a convex lens, then its image is formed at:

Question # 4

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

Question # 5

Huygen's theory cannot explain

Question # 6

A grating with high resolving power can distinguish _______ difference in wavelengths :

Question # 7

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

Question # 8

Least distance of distinct vision of an old man possibly becomes:

Question # 9

The property of light which does not change with the nature of the medium is:

Question # 10

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

Question # 11

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

Question # 12

Light has:

Question # 13

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

Question # 14

To observe interference of light, the condition, which must be met with is that the sources must be:

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 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 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
3 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
4 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
5 The cause of mirage observed in deserts in bright sunlight is due to
A. Refraction of light
B. Reflection of light
C. Scattering of light
D. Total internal reflection of light
6 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
A. The upper half of the image is cut off
B. The brightness of the image is reduced
C. The brightness of the image is increased
D. No effect at all
7 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
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 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
10 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

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