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

Question # 2

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

Question # 3

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

Question # 4

Huygen principle is used to determine:

Question # 5

In case of point, source of light shape of wavefront is:

Question # 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:

Question # 7

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

Question # 8

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

Question # 9

Light appears to travel in straight line because

Question # 10

With age, least distance of distinct vision:

Question # 11

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

Question # 12

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

Question # 13

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:

Question # 14

Angle between the ray of light and the corresponding wavefront is:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
2 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
3 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
4 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
5 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
6 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
7 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
8 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
9 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
10 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

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