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

Huygen's theory cannot explain

Question # 2

A prism splits a beam of white light into seven component colors. This is so because

Question # 3

Stars twinkle due to

Question # 4

Electromagnetic waves transport:

Question # 5

The image of the tip of a needle is never sharp because of

Question # 6

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

Question # 7

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

Question # 8

In order to get interference using two light rays

Question # 9

The contrast in the fringes in an interference pattern depends upon

Question # 10

Light waves are:

Question # 11

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

Question # 12

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

Question # 13

To sources are said to be coherent if they have:

Question # 14

The locus of all the points in the same phase of vibration is called:

Question # 15

Huygen principle is used to determine:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
3 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
4 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
5 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
6 If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:
A. 15 cm
B. 10 cm
C. 20 cm
D. 5 cm
7 In the formula R = N x m for diffraction grating, N denotes:
A. No. of lines/cm
B. No. of lines/meter
C. Total number of lines
D. None of above
8 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
9 To sources are said to be coherent if they have:
A. Same amplitude
B. Same wavelength
C. Definite phase relation with each other
D. None of them
10 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

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