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

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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Question # 10

The wave nature of light was proposed by:

Question # 11

Light waves are:

Question # 12

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

Question # 13

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

Question # 14

Huygen's principles states that:

Question # 15

A virtual image is formed when object is placed:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity
A. Fringe width will decrease
B. Fringe width will increase
C. Fringe width will remain unchanged
D. Fringe will become less intense
2 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
3 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
4 For the virtual image, option _______ is not correct:
A. 1/p = 1/f -1/q
B. 1/f = 1/p -1/q
C. 1/p=1/p-1/f
D. 1/p=1/f+1/q
5 Resolving power in mth order diffraction for grating is given by:
A. R = N x m
B. None of these
C. R = m/N
D. R = N/m
6 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
7 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
8 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
9 The ratio of the size of the image to that of object is called:
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis
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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