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

00:00
Question # 1

In order to get interference using two light rays

Question # 2

The focal length of convex lens having magnifying power of 5.55 is:

Question # 3

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

Question # 4

The wave nature of light was proposed by:

Question # 5

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

Question # 6

Laws of reflection and refraction can also be explained by:

Question # 7

The terms phase difference and path difference are:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

According to Huygen's principle

Question # 12

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

Question # 13

A virtual image is formed when object is placed:

Question # 14

To sources are said to be coherent if they have:

Question # 15

The magnifier forms a virtual image of the object at:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 According to Huygen's principle
A. light travels in straight line
B. Light is a transvers wave
C. Light has dual nature
D. All points on the primary wave-front are the sources of secondary wavelets
2 In order to get interference using two light rays
A. The sources should be monochromatic and coherent
B. The sources should have the same frequency
C. Superposition should be linear
D. All of these
3 A convex lens acts as diverging lens when the object is placed:
A. Between F and 2F
B. At 2F
C. With focal length
D. Beyond 2F
4 The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
A. Equal to
B. Greater than
C. Smaller than
D. None of these
5 A prism splits a beam of white light into seven component colors. This is so because
A. Phase of different colors is different
B. Amplitude of different colors is different
C. Wavelength of different colors is different
D. Velocity of different colors is different
6 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1
7 If the object is situated at focus of a convex lens, then its image is formed at:
A. F
B. 2F
C. Infinity
D. None of these
8 In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:
A. Greater than
B. Smaller than
C. Equal to
D. None of these
9 Light appears to travel in straight line because
A. It is not absorbed by the atmosphere
B. It is refracted by the atmosphere
C. Its wavelength is very small
D. Its velocity is very large
10 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm

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