12th Class Physics Wave Optics / तरंग प्रकाशिकी Question Bank

done MCQs - Wave Optics Total Questions - 14

• question_answer1)
  Wavefront generated from a line source is
  A)
  cylindrical wavefront done clear
  B)
  spherical wavefront done clear
  C)
  plane wavefront done clear
  D)
  either [a] or [b] done clear
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• question_answer2)
  Phase difference between any two points of a wavefront is
  A)
  \[\pi \] done clear
  B)
  \[\pi \]/2 done clear
  C)
  0 done clear
  D)
  \[\pi \]/4 done clear
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• question_answer3)
  In Huygens theory, light waves
  A)
  are transverse waves and require a medium to travel. done clear
  B)
  are longitudinal waves and require a medium to travel. done clear
  C)
  are transverse waves and require no medium to travel, done clear
  D)
  are longitudinal waves and require no medium to travel. done clear
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• question_answer4)
  Huygens theory could not explain
  A)
  photoelectric effect. done clear
  B)
  reflection of light. done clear
  C)
  diffraction of light. done clear
  D)
  interference of light. done clear
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• question_answer5)
  Which of the following statement is true?
  A)
  According to both Maxwell's electromagnetic theory and Huygens wave theory light is treated as a wave in nature and require medium to travel. done clear
  B)
  According to both Maxwell's electromagnetic theory and Huygens wave theory light is treated as a particle in nature and require medium to travel. done clear
  C)
  According to both Maxwell's electromagnetic theory and Huygens wave theory light is treated as a wave in nature and does not require medium to travel. done clear
  D)
  According to Maxwell's electromagnetic theory light is treated as a wave in nature and require no medium to travel. According to Huygens theory light is treated as a wave in nature and require medium to travel. done clear
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• question_answer6)
  In a Young's double-slit experiment the source is white light. One of the holes is covered by a red filter and another by a blue filter. In this case,
  A)
  there shall be alternate interference patterns of red and blue. done clear
  B)
  there shall be an interference pattern for red distinct from that for blue. done clear
  C)
  there shall be no interference fringes. done clear
  D)
  there shall be an interference pattern for red mixing with one for blue. done clear
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• question_answer7)

  Figure shows a standard two-slit arrangement with slits\[{{\operatorname{S}}_{1}},{{\operatorname{S}}_{2}}\]. \[{{\operatorname{P}}_{1}},{{P}_{2}}\] are the two minima points on either side of P shows in Figure. At \[{{\operatorname{P}}_{2}}\] on the screen, there is a hole and behind \[{{\operatorname{P}}_{2}}\] is a second screen, 2-slit arrangement with slits \[{{\operatorname{S}}_{3}}\] and \[{{\operatorname{S}}_{4}}\] and a second screen behind them.

   
  A)
  There would be no interference pattern on the second screen but it would be lighted. done clear
  B)
  The second screen would be totally dark. done clear
  C)
  There would be a single bright point on the second screen. done clear
  D)
  There would be a regular two slit pattern on the second screen. done clear
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• question_answer8)
  In Young's double slit experiment, the distance between the slits is reduced to half and the distance between the slits and the screen is doubled. The fringe width
  A)
  will be double. done clear
  B)
  will be half. done clear
  C)
  will remain same. done clear
  D)
  will be four times. done clear
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• question_answer9)
  A Young's double slit experiment is performed with blue (wavelength \[460\text{ }nm\]) and green light (wavelength \[550\text{ }nm\]) respectively. If y is the distance of 4th maximum from the central fringe then
  A)
  \[{{y}_{B}}={{y}_{G}}\] done clear
  B)
  \[{{y}_{B}}>{{y}_{G}}\] done clear
  C)
  \[{{y}_{G}}>{{y}_{\operatorname{B}}}\] done clear
  D)
  \[{{y}_{B}}/{{y}_{G}}=550/460\] done clear
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• question_answer10)
  A Young's Double slit experiment is performed in air and in water. Which of the following relationship is true regarding fringe width (\[\beta \])?
  A)
  \[{{\beta }_{AIR}}>{{\beta }_{WATER}}\] done clear
  B)
  \[{{\beta }_{WATER}}>{{\beta }_{AIR}}\] done clear
  C)
  \[{{\beta }_{AIR}}={{\beta }_{WATER}}\] done clear
  D)
  \[{{\beta }_{WATER}}=0\] done clear
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• question_answer11)
  The penetration of light into the region of geometrical shadow is known as
  A)
  interference of light. done clear
  B)
  diffraction of light. done clear
  C)
  refraction of light. done clear
  D)
  polarization of light. done clear
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• question_answer12)
  Angular width of central maxima of a single slit diffraction pattern is independent of
  A)
  slit width done clear
  B)
  frequency of the light used done clear
  C)
  wavelength of the light used done clear
  D)
  distance between slit and screen done clear
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• question_answer13)
  When a monochromatic light is passed around a file wire a diffraction pattern is observed. How the fringe width will change by increasing the diameter?
  A)
  Fringe width has no relation with the diameter of wire done clear
  B)
  Increases done clear
  C)
  Decreases done clear
  D)
  Fringe width changes with change of wavelength only done clear
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• question_answer14)
  The main condition for diffraction to be observed is
  A)
  size of obstacle should be comparable to the wavelength of the wave done clear
  B)
  size of obstacle should be much larger than the wavelength of the wave done clear
  C)
  size of obstacle should be much smaller than the wavelength of the wave done clear
  D)
  for any size of obstacle done clear
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