MDCAT Pakistan · Physics

Waves, Oscillations and Optics

9 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 9 questions

  1. A simple pendulum of length L has a period T on Earth. If its length is quadrupled (4 L) and it is taken to the Moon where acceleration due to gravity is g/6, what is its new period?
  2. In a Young's double-slit experiment, the slit separation is d = 0.20 mm, the screen distance is D = 1.0 m, and light of wavelength lambda = 600 nm is used. What is the fringe width (fringe separation…
  3. An ambulance siren emits a frequency of 600 Hz while approaching a stationary observer at a speed of 30 m/s. What frequency does the observer perceive? (Speed of sound in air = 330 m/s)
  4. What is the critical angle for total internal reflection at a boundary between glass (refractive index n1 = 1.50) and water (n2 = 1.33)?
  5. An object is placed 15 cm in front of a convex (converging) lens of focal length 10 cm. What are the image distance and image characteristics?
  6. For a pipe of length L open at both ends, what is the wavelength of the fundamental (first harmonic) standing wave?
  7. In simple harmonic motion, at what displacement from the equilibrium position is the kinetic energy equal to the potential energy?
  8. What optical condition causes chromatic aberration in refracting optical instruments such as lenses?
  9. Two sound waves of frequencies 256 Hz and 260 Hz are sounded simultaneously. What is the beat frequency heard by an observer?

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