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

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:

Question # 2

Stars twinkle due to

Question # 3

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

Question # 4

The least distance of distinct vision is:

Question # 5

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

Question # 6

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 # 7

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

Question # 8

Huygen's principles states that:

Question # 9

Electromagnetic waves transport:

Question # 10

The contrast in the fringes in an interference pattern depends upon

Question # 11

Least distance of distinct vision of an old man possibly becomes:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Least distance of distinct vision of an old man possibly becomes:
A. A little less than 25 cm
B. A little more than 25 cm
C. Much less than 25 cm
D. None of these
2 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
3 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
A. Refraction
B. Reflection
C. Diffraction
D. Formation of spectrum
4 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
5 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
6 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
7 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
8 A convex lens acts as diverging lens when the object is placed:
A. Between F and 2F
B. At 2F
C. With focal length
D. Beyond 2F
9 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
10 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m

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