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

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

Question # 2

The wave nature of light was proposed by:

Question # 3

Stars twinkle due to

Question # 4

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

Question # 5

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

Question # 6

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

Question # 7

Light has:

Question # 8

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 # 9

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

Question # 10

Huygen's principles states that:

Question # 11

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

Question # 12

To sources are said to be coherent if they have:

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
A. Greater than
B. Equal to
C. Smaller than
D. None of these
3 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
4 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
5 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
6 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
7 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
8 Light appears to travel in straight line because
A. It is not absorbed by the atmosphere
B. It is refracted by the atmosphere
C. Its wavelength is very small
D. Its velocity is very large
9 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
10 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted

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