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

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Question # 1

Huygen's principles states that:

Question # 2

Angle between the ray of light and the corresponding wavefront is:

Question # 3

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

Question # 4

Light has:

Question # 5

Stars twinkle due to

Question # 6

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

Question # 7

The wave nature of light was proposed by:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

The ratio of the size of the image to that of object is called:

Question # 14

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 # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
2 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
3 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
4 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
5 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted
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 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:
A. 15 cm
B. 10 cm
C. 20 cm
D. 5 cm
8 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
9 Resolving power in mth order diffraction for grating is given by:
A. R = N x m
B. None of these
C. R = m/N
D. R = N/m
10 The contrast in the fringes in an interference pattern depends upon
A. Fringe width
B. Relative difference intensities of the two sources
C. Distance between the slits
D. Wavelength

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