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

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

Question # 2

In case of point, source of light shape of wavefront is:

Question # 3

The image of the tip of a needle is never sharp because of

Question # 4

According to Huygen's principle

Question # 5

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

Question # 6

Angle between the ray of light and the corresponding wavefront is:

Question # 7

Light has:

Question # 8

A virtual image is formed when object is placed:

Question # 9

Speed of light in vacuum depends upon:

Question # 10

Which one of the following can act approximately as a source of monochromatic light;

Question # 11

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

Question # 12

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

Question # 13

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

Question # 14

Electromagnetic waves transport:

Question # 15

With age, least distance of distinct vision:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
2 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
3 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
4 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
5 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
6 A virtual image is formed when object is placed:
A. Within focal length of a convex lens
B. Near the focal point of a concave lens
C. Both A and B
D. Away from 2F of a convex lens
7 To observe interference of light, the condition, which must be met with is that the sources must be:
A. Monochromatic
B. Phase coherent
C. Both of above
D. None of above
8 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
9 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
10 The image of the tip of a needle is never sharp because of
A. Polarization of light
B. Interference of light
C. Diffraction of light
D. Reflection of light

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