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

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 # 2

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

Question # 3

Electromagnetic waves transport:

Question # 4

A magnifier gives an image which is:

Question # 5

Huygen's theory cannot explain

Question # 6

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

Question # 7

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Question # 8

The terms phase difference and path difference are:

Question # 9

The image of the tip of a needle is never sharp because of

Question # 10

To see the minor details of the object by microscope, it should have:

Question # 11

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

Question # 12

The magnifier forms a virtual image of the object at:

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 The magnifier forms a virtual image of the object at:
A. None of these
B. Least distance of distinct vision
C. Much farther than the least distance
D. Both A and B are correct
3 To see the minor details of the object by microscope, it should have:
A. High magnifying power
B. High resolving power
C. Am objective of larger focal length
D. None of these
4 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
5 The distance from eye to near point is taken as:
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
6 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
7 In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
A. Greater than
B. Equal to
C. Smaller than
D. None of these
8 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
9 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
10 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

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