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

A magnifier gives an image which is:

Question # 2

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

Question # 3

According to Huygen's principle

Question # 4

The wave nature of light was proposed by:

Question # 5

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

Question # 6

Huygen principle is used to determine:

Question # 7

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

Question # 8

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

Question # 9

Speed of light in vacuum depends upon:

Question # 10

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

Question # 11

The terms phase difference and path difference are:

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

For the virtual image, option _______ is not correct:

Question # 14

Laws of reflection and refraction can also be explained by:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
2 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
3 The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
A. Equal to
B. Greater than
C. Smaller than
D. None of these
4 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
5 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
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 A convex lens acts as diverging lens when the object is placed:
A. Beyond 2F
B. At 2F
C. With focal length
D. Between F and 2F
8 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:
A. 5 cm
B. 10 cm
C. 20 cm
D. 25 cm
9 A ray passing through optical center of a lens, after refraction:
A. Passes through focus
B. Go deviated
C. Retraces its path
D. Both B and C
10 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these

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