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The MCQs below are drawn from the Current Affairs subject category.
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64921
Phase change of 180° is equivalent to a path difference of:
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Correct Option
Explanation
The explanatory answer in the block states that 180° corresponds to λ/2, so option C is correct.
64922
The path difference and phase difference are related to each other as:
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Correct Option
Explanation
The block's explanatory answer explicitly states option B as correct: 'Phase difference = (path difference)'.
64923
In case of YDS experiment, the fringe spacing varies with slit separation d and varies with distance L between slits and screen.
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Correct Option
Explanation
The block gives the explanatory answer C; fringe spacing is inversely proportional to d and directly proportional to L (Ay = λL/d).
64924
If the slits in YDS experiment are made closer, fringe spacing will:
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Correct Option
Explanation
The block's explanatory answer indicates A; making slits closer (decreasing d) increases fringe spacing (Ay = λL/d).
64925
The diffraction of light was discovered by
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Correct Option
Explanation
Francesco Grimaldi first observed and described diffraction effects of light, making him the discoverer.
64926
Diffraction effect is:
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Correct Option
Explanation
A sharp edge produces stronger diffraction because abrupt discontinuities scatter the wave more effectively compared to a smooth rounded edge.
64927
The fringe width in YDS experiment can be increased by decreasing:
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Correct Option
Explanation
The explanatory answer in the block states option C; decreasing slit separation d increases fringe width (Ay = λL/d).
64928
In case of YDS experiment, the distance between adjacent bright fringes is given by:
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Correct Option
Explanation
The block's explanatory answer indicates option A; the standard YDS fringe spacing formula is Ay = λL/d, matching A.
64929
Wavelength of X-ray is of the order of:
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Correct Option
Explanation
Typical X-ray wavelengths are about 1 Å (10^-10 meter), so the order of 1 Å is the correct choice among the provided options.
64930
8. Huyghen's principle of secondary waves
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Correct Option
Explanation
Huygens' principle is a constructive geometrical method for locating wavefront positions by secondary wavelets.
