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

Conventionally, all the distance p, q, f are measured from _____ of the lens:

Question # 2

Light waves are:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

The wave nature of light was proposed by:

Question # 7

Huygen principle is used to determine:

Question # 8

According to Huygen's principle

Question # 9

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

Question # 10

The distance from eye to near point is taken as:

Question # 11

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

Question # 12

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

Question # 13

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 # 14

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 15

Laws of reflection and refraction can also be explained by:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
2 In the formula R = N x m for diffraction grating, N denotes:
A. No. of lines/cm
B. No. of lines/meter
C. Total number of lines
D. None of above
3 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
4 Resolving power in mth order diffraction for grating is given by:
A. R = N x m
B. None of these
C. R = m/N
D. R = N/m
5 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
6 If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:
A. Double the size
B. Same size
C. Half the size
D. None of these
7 Resolving power in mth order diffraction for grating is given by:
A. R = N/m
B. R = m/N
C. R = N x m
D. None of these
8 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
9 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
10 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

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