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

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

Question # 2

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

Question # 3

Stars twinkle due to

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

Question # 9

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

Question # 10

Electromagnetic waves transport:

Question # 11

A prism splits a beam of white light into seven component colors. This is so because

Question # 12

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

Question # 13

Huygen's principles states that:

Question # 14

The least distance of distinct vision is:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
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 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
A. Refraction
B. Reflection
C. Diffraction
D. Formation of spectrum
4 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
5 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
6 In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.
A. Bright
B. Dark
C. Any of A and B
D. None of these
7 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
8 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
9 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
10 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

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