Doppler Effect MCQ

Test your knowledge with important Doppler Effect MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Doppler Effect MCQs at Bissoy

• A man is moving towards a wall with a source of sound in his hand. Frequency of source = 50Hz. Speed of man = 8m/s. If the man sends one pulse of sound, what will be the frequency heard by him after sound reflects off the wall? Speed of sound = 330m/s.
  ক

  53.86Hz

  খ

  52.48Hz

  গ

  51.24Hz

  ঘ

  52.45Hz
• If both the source of sound and observer are moving, the apparent frequency will be different from the actual frequency. True or False?
  ক

  True

  খ

  False
• A man jumps from a building with a source of sound. When he reaches halfway down, he starts the siren of frequency 100Hz. A person standing below him on the ground hears the first sound to be of frequency 120Hz. What is the height of the building? Speed of sound = 330m/s. Take g=9.81m/s2.
  ক

  154m

  খ

  308m

  গ

  77m

  ঘ

  500m
• A source of frequency 50Hz is moving towards an observer with a deceleration of 2m/s2. If its initial speed is 20m/s, what will be the maximum frequency heard by the observer? Initial distance between source and observer is 100m. Speed of sound = 330m/s.
  ক

  47.14Hz

  খ

  0

  গ

  53.22Hz

  ঘ

  53.03Hz
• A source moves towards a stationary observer with a speed of 10m/s. If the frequency of the source is 10Hz what will be the wavelength of sound heard by the observer? Speed of sound = 330m/s.
  ক

  32m

  খ

  34m

  গ

  33m

  ঘ

  31m
• A source of sound moves towards an observer. What happens to the speed of sound in the medium?
  ক

  Increases

  খ

  Decreases

  গ

  Remains the same

  ঘ

  Depends on speed with which source moves
• A train with a frequency ‘f’. What will be the frequency heard by a person sitting in the train? Speed of the train is ‘v’.
  ক

  f

  খ

  f(330+v)/330

  গ

  fv/(330-v)

  ঘ

  fv/(330+v)
• An observer is standing stationary in air moving at a speed of 2m/s. A source of frequency 20Hz is moving in the direction of wind with speed 10m/s towards the observer. What will be the frequency as heard by the observer? Speed of sound in air is 330m/s.
  ক

  20.62Hz

  খ

  19.40Hz

  গ

  21.68Hz

  ঘ

  22.63Hz
• In case of electromagnetic waves, doppler shifts are independent of whether source moves or observer provided relative speed is the same. True or False?
  ক

  True

  খ

  False