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

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

Question # 2

Huygen's principles states that:

Question # 3

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

Question # 4

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

Question # 5

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

Question # 6

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

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

For the virtual image, option _______ is not correct:

Question # 10

In an interference pattern of Young's double slit(YDS) experiment:

Question # 11

According to Huygen's principle

Question # 12

The property of light which does not change with the nature of the medium is:

Question # 13

Electromagnetic waves transport:

Question # 14

The magnifier forms a virtual image of the object at:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
2 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
3 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted
4 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
5 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
6 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
7 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
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 The ratio of the size of the image to that of object is called:
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis
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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