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Online Tests
Physics ECAT Pre Engineering Chapter 9 Physical Optics Online Test MCQs With Answers
Question # 1
When the object lies between F and 2F, the image formed by is formed at:
Choose an answer
Real
Virtual
Diminished
Erect
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Question # 2
A convex lens acts as diverging lens when the object is placed:
Choose an answer
Between F and 2F
At 2F
With focal length
Beyond 2F
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Question # 3
A virtual image is formed when object is placed:
Choose an answer
Within focal length of a convex lens
Near the focal point of a concave lens
Both A and B
Away from 2F of a convex lens
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Question # 4
With age, least distance of distinct vision:
Choose an answer
Increases
Decreases
Is not affected
None is correct
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Question # 5
In an interference pattern of Young's double slit(YDS) experiment:
Choose an answer
Bright fringesare wider than dark fringes
Dark fringes are wider than bright fringes
Both dark and bright fringes are of equal width
Central fringes are wider than the outer fringes
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Question # 6
Light waves are:
Choose an answer
Transverse wave
Longitudinal wave
Compressional wave
None of them
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Question # 7
A convex lens acts as diverging lens when the object is placed:
Choose an answer
Between F and 2F
At 2F
With focal length
Beyond 2F
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Question # 8
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
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Question # 9
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
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Question # 10
Conventionally, all the distance p, q, f are measured from _____ of the lens:
Choose an answer
Focus
Optical center
Edges
None of these
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Question # 11
The property of light which does not change with the nature of the medium is:
Choose an answer
Frequency
Amplitude
Wavelength
None of these
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Question # 12
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
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Question # 13
Laws of reflection and refraction can also be explained by:
Choose an answer
Particle nature of light
Quantum nature of light
Wave nature of light
Complex nature of light
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Question # 14
Huygen's principles states that:
Choose an answer
Light travels in straigth line
Light has dual nature
Either of these
None of these
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Question # 15
The terms phase difference and path difference are:
Choose an answer
Same
Different
Equal
None of these
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Question # 16
A grating with high resolving power can distinguish _______ difference in wavelengths :
Choose an answer
Smaller
Larger
Zero
None of these
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