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Entry Test MCQ :: Physical Optics


31.  Which one of the following cannot be polarized?
A. radio waves B. ultraviolot rays
C. X-rays D. sound waves

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

33.  In monochromatic red light a blue book will probably appear to be
A. black B. purple
C. green D. no scientific reasoning available

34.  A thing that emits its own light is
A. luminous B. non-luminous
C. incandescent D. bright

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

36.  gives the definition of metre in terms of wavelength of red cadmium light
A. Newton B. Einstein
C. Michelson D. Galileo

37.  In Michelson interferometer to switch the fringe from bright to dark the mirror should be displaced through
A. ? / 2 B. ?/3
C. ?/6 D. ?/4

38.  In the shadow of a ball the central portion appears bright that happens due to
A. Interference B. Diffraction
C. Polarization D. Refraction

39.  Which experiment shows that wavelength of light is smaller than that of sound
A. Diffraction B. Polarization
C. Interference D. Reflection

40.  Crystals of a material can behave as
A. Convex lens B. Interferometer
C. Diffraction grating D. Concave




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