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

Stars twinkle due to

Question # 2

The wave nature of light was proposed by:

Question # 3

With age, least distance of distinct vision:

Question # 4

The magnifier forms a virtual image of the object at:

Question # 5

A magnifier gives an image which is:

Question # 6

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

Question # 7

The locus of all points in a medium having same phase of vibration is called

Question # 8

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

Question # 9

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

Question # 10

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

Question # 11

Huygen principle is used to determine:

Question # 12

The terms phase difference and path difference are:

Question # 13

The locus of all the points in the same phase of vibration is called:

Question # 14

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

Question # 15

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:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
2 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
3 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
4 Stars twinkle due to
A. The fact that they do not emit light continuously
B. The refractive index of earth's atmosphere fluctuates
C. The Star's atmosphere absorbs its light intermittently
D. None of these
5 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
6 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
7 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
8 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
9 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. 5 cm
B. 20 cm
C. 10 cm
D. 15 cm
10 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

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