Entry Test MCQ :: Physical Optics
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31. |
Which one of the following cannot be polarized? |
A. |
radio waves |
B. |
ultraviolot rays |
C. |
X-rays |
D. |
sound waves |
Answer: Option D
Explanation:
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32. |
Diffarction fringes are |
A. |
equally spaced |
B. |
distance between them increases |
C. |
distance between then decreases |
D. |
they are adjacent with no space in between |
Answer: Option C
Explanation:
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33. |
In monochromatic red light a blue book will probably appear to be |
A. |
black |
B. |
purple |
C. |
green |
D. |
no scientific reasoning available |
Answer: Option A
Explanation:
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34. |
A thing that emits its own light is |
A. |
luminous |
B. |
non-luminous |
C. |
incandescent |
D. |
bright |
Answer: Option A
Explanation:
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35. |
In double slit experiment if one of the two slit is covered then |
A. |
no interference fringes are observed |
B. |
no diffraction fringes are observed |
C. |
no fringes observed |
D. |
interference pattern not disturbed |
Answer: Option A
Explanation:
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36. |
gives the definition of metre in terms of wavelength of red cadmium light |
A. |
Newton |
B. |
Einstein |
C. |
Michelson |
D. |
Galileo |
Answer: Option C
Explanation:
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37. |
In Michelson interferometer to switch the fringe from bright to dark the mirror should be displaced through |
Answer: Option D
Explanation:
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38. |
In the shadow of a ball the central portion appears bright that happens due to |
A. |
Interference |
B. |
Diffraction |
C. |
Polarization |
D. |
Refraction |
Answer: Option B
Explanation:
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39. |
Which experiment shows that wavelength of light is smaller than that of sound |
A. |
Diffraction |
B. |
Polarization |
C. |
Interference |
D. |
Reflection |
Answer: Option A
Explanation:
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40. |
Crystals of a material can behave as |
A. |
Convex lens |
B. |
Interferometer |
C. |
Diffraction grating |
D. |
Concave |
Answer: Option C
Explanation:
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