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

A grating with high resolving power can distinguish _______ difference in wavelengths :

Question # 2

The distance from eye to near point is taken as:

Question # 3

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 # 4

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

Question # 5

The least distance of distinct vision is:

Question # 6

The contrast in the fringes in an interference pattern depends upon

Question # 7

The magnifier forms a virtual image of the object at:

Question # 8

Huygen's theory cannot explain

Question # 9

Stars twinkle due to

Question # 10

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

Question # 11

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

Question # 12

Light has:

Question # 13

Huygen principle is used to determine:

Question # 14

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

Question # 15

The size of the image is maximum when its distance from the magnifying glass is:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
3 The distance from eye to near point is taken as:
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
4 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
5 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
6 Resolving power in mth order diffraction for grating is given by:
A. R = N/m
B. R = m/N
C. R = N x m
D. None of these
7 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
8 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
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 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction

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