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

Question # 2

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

Question # 3

A virtual image is formed when object is placed:

Question # 4

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

Question # 5

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

Question # 6

Huygen's theory cannot explain

Question # 7

To sources are said to be coherent if they have:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

Light appears to travel in straight line because

Question # 13

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

Question # 14

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:

Question # 15

The terms phase difference and path difference are:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
3 The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called
A. Diffraction
B. Interference
C. Polarization
D. Dispersion
4 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
5 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
6 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
7 Huygen's theory cannot explain
A. Diffraction
B. Interference
C. Polarization
D. Photoelectric effect
8 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
9 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
10 Least distance of distinct vision of an old man possibly becomes:
A. A little less than 25 cm
B. A little more than 25 cm
C. Much less than 25 cm
D. None of these

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