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 a source of light isat very large distance,the shape of wavefront is:

Question # 2

The contrast in the fringes in an interference pattern depends upon

Question # 3

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

Question # 4

The distance from eye to near point is taken as:

Question # 5

The locus of all points in a medium having same phase of vibration is called

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

Question # 10

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

Question # 11

To sources are said to be coherent if they have:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

Huygen's theory cannot explain

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
3 In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.
A. Bright
B. Dark
C. Any of A and B
D. None of these
4 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
5 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
6 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
7 The locus of all the points in the same phase of vibration is called:
A. Wave packet
B. Wave front
C. Wave number
D. None of them
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 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
10 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect

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