More Classes
5th Class
6th Class
7th Class
8th Class
9th Class
10th Class
11th Class
12th Class
NAT I
NAT II
CSS
IQ
General Knowledge
MDCAT
ECAT
GAT General
GAT Subject
Other Links
Go to Home
Online Tests
Physics ECAT Pre Engineering Chapter 9 Physical Optics Online Test MCQs With Answers
Question # 1
The image of the tip of a needle is never sharp because of
Choose an answer
Polarization of light
Interference of light
Diffraction of light
Reflection of light
Previous
Skip
Next
Question # 2
The cause of mirage observed in deserts in bright sunlight is due to
Choose an answer
Refraction of light
Reflection of light
Scattering of light
Total internal reflection of light
Previous
Skip
Next
Question # 3
To see the minor details of the object by microscope, it should have:
Choose an answer
High magnifying power
High resolving power
Am objective of larger focal length
None of these
Previous
Skip
Next
Question # 4
The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
Choose an answer
1
0.2
2
0.1
Previous
Skip
Next
Question # 5
Least distance of distinct vision of an old man possibly becomes:
Choose an answer
A little less than 25 cm
A little more than 25 cm
Much less than 25 cm
None of these
Previous
Skip
Next
Question # 6
When the object lies between F and 2F, the image formed by is formed at:
Choose an answer
Real
Virtual
Diminished
Erect
Previous
Skip
Next
Question # 7
A prism splits a beam of white light into seven component colors. This is so because
Choose an answer
Phase of different colors is different
Amplitude of different colors is different
Wavelength of different colors is different
Velocity of different colors is different
Previous
Skip
Next
Question # 8
The size of the image is maximum when its distance from the magnifying glass is:
Choose an answer
0.10 m
0.15 m
0.20 m
0.25 m
Previous
Skip
Next
Question # 9
Light waves are:
Choose an answer
Transverse wave
Longitudinal wave
Compressional wave
None of them
Previous
Skip
Next
Question # 10
How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
Choose an answer
The upper half of the image is cut off
The brightness of the image is reduced
The brightness of the image is increased
No effect at all
Previous
Skip
Next
Question # 11
A grating with high resolving power can distinguish _______ difference in wavelengths :
Choose an answer
Smaller
Larger
Zero
None of these
Previous
Skip
Next
Question # 12
Wave length of that color as compared to that of violet color is:
Choose an answer
Smaller
Longer
Equal
None of these
Previous
Skip
Next
Question # 13
A line which represents the direction of travel of a wave is known as:
Choose an answer
Spherical Wavefront
Locus
Ray
Either B or C
Previous
Skip
Next
Question # 14
Resolving power in mth order diffraction for grating is given by:
Choose an answer
R = N/m
R = m/N
R = N x m
None of these
Previous
Skip
Next
Question # 15
According to Huygen's principle
Choose an answer
light travels in straight line
Light is a transvers wave
Light has dual nature
All points on the primary wave-front are the sources of secondary wavelets
Previous
Skip
Next
Question # 16
Huygen's principles states that:
Choose an answer
Light travels in straigth line
Light has dual nature
Either of these
None of these
Previous
Skip
Next
Question # 17
Light appears to travel in straight line because
Choose an answer
It is not absorbed by the atmosphere
It is refracted by the atmosphere
Its wavelength is very small
Its velocity is very large
Previous
Skip
Next
Question # 18
In order to get interference using two light rays
Choose an answer
The sources should be monochromatic and coherent
The sources should have the same frequency
Superposition should be linear
All of these
Previous
Skip
Next
Back