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Physics ECAT Pre Engineering Chapter 9 Physical Optics Online Test MCQs With Answers
Question # 1
Light has:
Choose an answer
Wave nature
Particle nature
Dual nature
None of these
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Question # 2
Monochromatic light means waves of:
Choose an answer
Same frequency
Same colour
Same wavelength
All of them
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Question # 3
A grating with high resolving power can distinguish _______ difference in wavelengths :
Choose an answer
Smaller
Larger
Zero
None of these
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Question # 4
The contrast in the fringes in an interference pattern depends upon
Choose an answer
Fringe width
Relative difference intensities of the two sources
Distance between the slits
Wavelength
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Question # 5
The locus of all the points in the same phase of vibration is called:
Choose an answer
Wave packet
Wave front
Wave number
None of them
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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:
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5 cm
10 cm
15 cm
20 cm
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Question # 7
A grating with high resolving power can distinguish _______ difference in wavelengths :
Choose an answer
Smaller
Larger
Zero
None of these
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Question # 8
The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
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Equal to
Greater than
Smaller than
None of these
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Question # 9
The magnifier forms a virtual image of the object at:
Choose an answer
Least distance of distinct vision
Much farther than the least distance
Both A and B are correct
None of these
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Question # 10
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
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Question # 11
In the formula R = N x m for diffraction grating, N denotes:
Choose an answer
No. of lines/cm
No. of lines/meter
Total number of lines
None of above
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Question # 12
To observe interference of light, the condition, which must be met with is that the sources must be:
Choose an answer
Monochromatic
Phase coherent
Both of above
None of above
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Question # 13
The ratio of the size of the image to that of object is called:
Choose an answer
Focal length
Aperture
Linear magnification
Principal axis
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Question # 14
When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
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Greater, smaller
Smaller, smaller
Smaller, larger
Greater, larger
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Question # 15
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
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Question # 16
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
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