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The MCQs below are drawn from the Physics subject category.
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1401
If the slits in YDS experiment are made closer, fringe spacing will:
A. Decrease
B. Remain same
C. Increase
D. None of above
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Explanation
The block's explanatory answer indicates A; making slits closer (decreasing d) increases fringe spacing (Ay = λL/d).
1402
A glass plate upon which is ruled a number of equally spaced opaque lines is called:
A. Interferometer
B. Thin film
C. Diffraction grating
D. None of these
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Explanation
A ruled glass plate with equally spaced opaque lines is the standard description of a diffraction grating.
1403
Laser light is considered to be coherent because it consists of:
A. divergent beams.
B. coordinated waves of exactly the same wavelength.
C. many wavelengths.
D. uncoordinated wavelengths.
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Explanation
Laser emission is highly monochromatic and phase-coherent, so it comprises coordinated waves of essentially the same wavelength.
1404
Which of the following is nearly monochromatic light?
A. Light from neon lamp
B. Light from sodium lamp
C. Light from fluorescent tube
D. Light from simple lamp
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Explanation
Sodium lamps emit a strong nearly single-wavelength doublet (around 589 nm), making their light nearly monochromatic.
1405
If white light is used in Young's double-slit experiment then
A. Very few coloured fringes can be seen with first order violet fringes being closer to the central white fringe
B. A very large number of coloured fringes with a central white fringe can be seen
C. A very large number of coloured fringes can be seen
D. Very few coloured fringes can be seen with first order red fringes being closer to the central white fringe
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Explanation
With white light the central fringe is white and only a few coloured fringes are visible; violet fringes (shorter λ) lie closer to the centre than red.
1406
Fringe spacing in double slit experiment can be increased by decreasing
A. distance between the slits and screen
B. wavelength of light
C. slits separation
D. width of slits
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Explanation
Fringe spacing β = λD/d, so decreasing the slit separation d increases the fringe spacing.
1407
In Young's double slit experiment the separation between the slits is halved and the distance between the slits and screen is doubled. The fringe width will be
A. halved
B. doubled
C. unchanged
D. quadrupled
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Explanation
Fringe width β = λD/d; if D → 2D and d → d/2 then β → (λ·2D)/(d/2) = 4(λD/d), so it is quadrupled.
1408
In case of interference fringes:
A. Energy is destroyed at dark fringes
B. Energy is created at bright fringes
C. Energy is transferred from dark to bright fringes
D. None of these
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Explanation
Interference redistributes intensity: destructive interference reduces intensity at dark fringes while constructive interference increases it at bright fringes, conserving total energy.
1409
The distance between any two consecutive bright or dark fringes is called
A. amplitude
B. fringe spacing
C. wavelet
D. wavelength
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Explanation
The separation between consecutive fringes in an interference pattern is termed fringe spacing.
1410
The principle of interference is necessary for
A. The appearance of colours
B. The production of beats
C. The appearance of curves
D. None of these
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Explanation
Interference of light waves is responsible for the appearance of colours in phenomena such as thin-film interference.
