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General Knowledge > General Science

WAVES AND MOTIONS MCQs

Laws Of Motion, Second Law Motion, Uniform Circular Motion, First Law Of Motion, Third Law Motion, Horizontal Projectile Motion, Oscillations And Waves, Radio Wave Propagation, Wave Optics

Total Questions : 131 | Page 5 of 14 pages
Question 41. A 20-dB reduction in the strength of a radio wave due to reflection is called:
  1.    fading
  2.    diffraction
  3.    frequency diversity
  4.    spatial diversity
 Discuss Question
Answer: Option A. -> fading
Question 42. Which among the following is an application of high frequency?
  1.    SONAR
  2.    Subsurface communication
  3.    Radio navigation
  4.    Facsimile
 Discuss Question
Answer: Option D. -> Facsimile
Question 43. Radio wave that is far from its sources is called
  1.    Plane wave
  2.    isotropic wave
  3.    vertical wave
  4.    horizontal wave
 Discuss Question
Answer: Option A. -> Plane wave
Question 44. Mathematical prediction of radio waves was done by
  1.    Einstein
  2.    Hertz
  3.    Faraday
  4.    Maxwell
 Discuss Question
Answer: Option D. -> Maxwell
Question 45. The radio waves were demonstrated experimentally by
  1.    Hertz
  2.    Marconi
  3.    Maxwell
  4.    Armstrong
 Discuss Question
Answer: Option A. -> Hertz
Question 46. Using the fact that light travels at 3
  1.    5.12 x 1014 Hz
  2.    176 Hz
  3.    0.14 Hz
  4.    3 x 108 Hz
 Discuss Question
Answer: Option A. -> 5.12 x 1014 Hz
Question 47. How is light affected by an increase in the index of refraction?
  1.    Its frequency increases
  2.    Its frequency decreases
  3.    Its speed increases
  4.    Its speed decreases
 Discuss Question
Answer: Option D. -> Its speed decreases
Question 48. If a wave from one slit of a Young's double-slit experiment set-up arrives at a point on the screen one wavelength behind the wave from the other slit, what is observed at that point?
  1.    dark fringe
  2.    bright fringe
  3.    multi-colored fringe
  4.    gray fringe, neither bright nor dark
 Discuss Question
Answer: Option B. -> bright fringe
Question 49. Which of the following statements about mirrors and lenses is correct?
  1.    Mirrors and lenses both utilize reflection.
  2.    Mirrors and lenses both utilize refraction.
  3.    Mirrors utilize reflection while lenses utilize refraction.
  4.    Mirrors utilize refraction while lenses utilize reflection.
 Discuss Question
Answer: Option C. -> Mirrors utilize reflection while lenses utilize refraction.
Question 50. Resolving power of a microscope is
  1.    1.22λ2a\frac{1.22λ}{2a}2a1.22λ​
  2.    2a1.22 λ\frac{2a}{1.22\ \lambda}1.22 λ2a​
  3.    (2nsin⁡β)1.22λ\frac{\left(2n\sin\beta\right)}{1.22\lambda}1.22λ(2nsinβ)​
  4.    1.22λ2n sin⁡β\frac{1.22\lambda}{2n\ \sin\beta}2n sinβ1.22λ​
 Discuss Question
Answer: Option C. -> (2nsin⁡β)1.22λ\frac{\left(2n\sin\beta\right)}{1.22\lambda}1.22λ(2nsinβ)​

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