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

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 # 2

Monochromatic light means waves of:

Question # 3

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

Question # 4

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

Question # 5

For the virtual image, option _______ is not correct:

Question # 6

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

Question # 7

When the object lies between F and 2F, the image formed by is formed at:

Question # 8

Light waves are:

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

Huygen principle is used to determine:

Question # 13

To see the minor details of the object by microscope, it should have:

Question # 14

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

Question # 15

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

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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 The focal length of convex lens having magnifying power of 5.55 is:
A. 5.5 cm
B. 5 cm
C. 4.5 cm
D. 6 cm
3 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
4 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
5 A line which represents the direction of travel of a wave is known as:
A. Spherical Wavefront
B. Locus
C. Ray
D. Either B or C
6 The magnifier forms a virtual image of the object at:
A. None of these
B. Both A and B are correct
C. Much farther than the least distance
D. Least distance of distinct vision
7 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
8 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
9 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
10 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

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