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

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

Question # 2

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

Question # 3

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

Question # 4

If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:

Question # 5

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

Question # 6

The distance from eye to near point is taken as:

Question # 7

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

Question # 8

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

Question # 9

The least distance of distinct vision is:

Question # 10

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

Question # 11

To sources are said to be coherent if they have:

Question # 12

With age, least distance of distinct vision:

Question # 13

According to Huygen's principle

Question # 14

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

Question # 15

In order to get interference using two light rays

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these
2 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
A. Greater, smaller
B. Smaller, smaller
C. Smaller, larger
D. Greater, larger
3 Which one of the following can act approximately as a source of monochromatic light;
A. Neon lamp
B. Fluorescent tube
C. Sodium lamp
D. None of these
4 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
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 locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
7 The cause of mirage observed in deserts in bright sunlight is due to
A. Refraction of light
B. Reflection of light
C. Scattering of light
D. Total internal reflection of light
8 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:
A. 6 x 10-5rad
B. 7 x 10-5rad
C. 8 x 10-5rad
D. None of these
9 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
10 In an interference pattern of Young's double slit(YDS) experiment:
A. Bright fringesare wider than dark fringes
B. Dark fringes are wider than bright fringes
C. Both dark and bright fringes are of equal width
D.

Central fringes are wider than the outer fringes

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