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

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

Question # 2

Least distance of distinct vision of an old man possibly becomes:

Question # 3

Electromagnetic waves transport:

Question # 4

For the virtual image, option _______ is not correct:

Question # 5

A ray passing through optical center of a lens, after refraction:

Question # 6

Huygen principle is used to determine:

Question # 7

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

Question # 8

Light waves are:

Question # 9

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

Question # 10

The velocity of light in vacuum can be changed by changing

Question # 11

Wave length of that color as compared to that of violet color is:

Question # 12

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:

Question # 13

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
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 Least distance of distinct vision of an old man possibly becomes:
A. A little less than 25 cm
B. A little more than 25 cm
C. Much less than 25 cm
D. None of these
4 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
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 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
7 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
8 In order to get interference using two light rays
A. The sources should be monochromatic and coherent
B. The sources should have the same frequency
C. Superposition should be linear
D. All of these
9 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
10 To see the minor details of the object by microscope, it should have:
A. High magnifying power
B. High resolving power
C. Am objective of larger focal length
D. None of these

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