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Online Tests
ECAT Pre General Science Physics Chapter 9 Physical Optics Online Test MCQs With Answers
Question # 1
Angle between the ray of light and the corresponding wavefront is:
Choose an answer
0
°
60
°
90
°
120
°
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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
For the virtual image, option _______ is not correct:
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1/p = 1/f -1/q
1/f = 1/p -1/q
1/p=1/p-1/f
1/p=1/f+1/q
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Question # 4
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 # 5
In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.
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Bright
Dark
Any of A and B
None of these
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Question # 6
The locus of all points in a medium having same phase of vibration is called
Choose an answer
Crest
Trough
Wavelength
Wave-front
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Question # 7
Wave length of light, on the average, is given by:
Choose an answer
10
-14
m
10
-10
m
10
-6
m
10
-4
m
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Question # 8
Light has:
Choose an answer
Wave nature
Particle nature
Dual nature
None of these
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Question # 9
If the object is situated at focus of a convex lens, then its image is formed at:
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F
2F
Infinity
None of these
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Question # 10
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:
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5 cm
10 cm
15 cm
20 cm
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Question # 11
A prism splits a beam of white light into seven component colors. This is so because
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Phase of different colors is different
Amplitude of different colors is different
Wavelength of different colors is different
Velocity of different colors is different
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Question # 12
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
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Question # 13
The appearance of the colour in the soap (oil) film results from:
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Dispersion
Interference
Reflection
Refraction
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Question # 14
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
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Question # 15
Huygen's principles states that:
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Light travels in straigth line
Light has dual nature
Either of these
None of these
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Question # 16
To sources are said to be coherent if they have:
Choose an answer
Same amplitude
Same wavelength
Definite phase relation with each other
None of them
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