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Free Superposition and Interference MCQs with Answers

68 Superposition and Interference MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Superposition states that overlapping waves produce a resultant displacement equal to the algebraic sum of their individual displacements. Interference covers constructive and destructive interference, phase difference, path difference, coherent sources, and conditions for maxima and minima. It differs from diffraction, which involves spreading around openings or obstacles.

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68 questions · page 4 of 4

61. The colors in the soap bubble are due to:

  • A. Interference
  • B. Dispersion of light
  • C. Scattering of light
  • D. Refraction of light

Explanation: The colors in a soap bubble are due to interference of light. When light reflects off the outer and inner surfaces of the thin soap film…

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Correct answer: Interference

62. When the light from two lamps falls on a screen, no interference pattern can be obtained. Why is this?

  • A. The lamps are not point sources.
  • B. The lamps emit light of different amplitudes.
  • C. The light from the lamps is not coherent.
  • D. The light from the lamps is white.

Explanation: When light from two separate lamps falls on a screen, interference patterns typically do not form because the light from each lamp is not…

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Correct answer: The light from the lamps is not coherent.

63. Monochromatic light passes through two parallel slits in a secreen and falls on a place of film. The patteren produced is an example of:

  • A. Refraction and diffraction
  • B. Interference and reflection
  • C. Interference and diffraction
  • D. Diffraction and polarization

Explanation: When monochromatic light passing through two parallel slit and falls on a screen, the pattern produced is due to interference and…

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Correct answer: Interference and diffraction

64. Using monochromatic light, interference fringes are produced on a screen placed a distance D from a pair of slits of separation a. The separation of the fringes is x. Both a and D are now doubled. What is the new fringe separation?

  • A. 2x
  • B. x
  • C. 3x
  • D. 4x

Explanation: For double slits: Wavelength λ = xa / Dwhere x: separation of fringes,a: slit separation / distance between slits,D = distance from slits…

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Correct answer: x

65. The colour of thin films is a result of:

  • A. Dispersion
  • B. Absorption of light
  • C. Scattering of light
  • D. Interference of light

Explanation: The correct answer is interference of light. The colors seen in thin films result from the interference of light waves reflected from the…

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Correct answer: Interference of light

66. Two tuning forks of frequencies 256Hz and 260Hz are sounded together the time interval between two consecutive maximum sound heard by a listener is:

  • A. 0.5 Sec
  • B. 2 Sec
  • C. 1 Sec
  • D. 0.25 Sec

Explanation: The beat frequency is determined by the difference between the two frequencies: Δf = 260 Hz - 256 Hz = 4 Hz.

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Correct answer: 0.25 Sec

67. In Young's double slit experiment both the separation between the slits and the distance between the slits and the screen are halved; then the fringe width is:

  • A. Halved
  • B. Unchanged
  • C. Doubled
  • D. Zero

Explanation: In Young's double-slit experiment, the fringe width is calculated using the formula:wavelength * distance_to_screen /…

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Correct answer: Unchanged

68. The general form of path difference in young's double slit experiment is "mλ" Its corresponding phase shift (in radians) is

  • A. mπ
  • B. 2 mπ
  • C. mπ/2
  • D. None

Explanation: Factual. General form for path difference is given as =2𝞹 Option A, C and D are not correct according to this.

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Correct answer: 2 mπ
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