ECAT Pre Engineering Physics Chapter 9 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Question # 1

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

Question # 2

The contrast in the fringes in an interference pattern depends upon

Question # 3

With age, least distance of distinct vision:

Question # 4

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

Question # 5

The magnifier forms a virtual image of the object at:

Question # 6

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

Question # 7

A line which represents the direction of travel of a wave is known as:

Question # 8

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

Question # 9

Which one of the following can act approximately as a source of monochromatic light;

Question # 10

The appearance of the colour in the soap (oil) film results from:

Question # 11

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

Question # 12

The terms phase difference and path difference are:

Question # 13

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

Question # 14

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

Question # 15

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
2 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
3 The contrast in the fringes in an interference pattern depends upon
A. Fringe width
B. Relative difference intensities of the two sources
C. Distance between the slits
D. Wavelength
4 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
5 Stars twinkle due to
A. The fact that they do not emit light continuously
B. The refractive index of earth's atmosphere fluctuates
C. The Star's atmosphere absorbs its light intermittently
D. None of these
6 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
7 Resolving power in mth order diffraction for grating is given by:
A. R = N/m
B. R = m/N
C. R = N x m
D. None of these
8 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1
9 The focal length of convex lens having magnifying power of 5.55 is:
A. 5.5 cm
B. 5 cm
C. 4.5 cm
D. 6 cm
10 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them

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