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

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

Question # 3

Wave length of light, on the average, is given by:

Question # 4

Light has:

Question # 5

The velocity of light in vacuum can be changed by changing

Question # 6

Frequency of red color as compared to that of violet color is:

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

Huygen's theory cannot explain

Question # 11

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

Question # 12

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

Question # 13

A virtual image is formed when object is placed:

Question # 14

Light appears to travel in straight line because

Question # 15

To observe interference of light, the condition, which must be met with is that the sources must be:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
3 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
4 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
5 A ray passing through optical center of a lens, after refraction:
A. Passes through focus
B. Go deviated
C. Retraces its path
D. Both B and C
6 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
7 The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
A. Equal to
B. Greater than
C. Smaller than
D. None of these
8 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
9 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
10 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

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