MDCAT Pakistan · Physics

Waves, Thermal Physics and Optics

23 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 23 questions

  1. What is the pressure due to a column of liquid of density 800 kg/m³ and depth 2 m? (take g = 10 m/s²)
  2. A wave has a frequency of 200 Hz and a wavelength of 2 m. What is its speed?
  3. A spring of constant 800 N/m is stretched by 0.1 m. How much energy is stored in it?
  4. What is the period of a simple pendulum of length 10 m? (take g = 10 m/s²)
  5. A resistor of 6 Ω carries a current of 2 A. What is the potential difference across it?
  6. Two resistors of 10 Ω and 10 Ω are connected in parallel. What is their combined resistance?
  7. A device on a 110 V supply draws 5 A. What is its power?
  8. A transformer has 200 turns on the primary coil and 1000 turns on the secondary. The primary voltage is 230 V. What is the secondary voltage?
  9. A gas in a rigid container is at 200 kPa and 400 K. It is heated to 800 K. What is the new pressure?
  10. A radioactive sample of 80 g has a half-life of 3 days. How much remains after 12 days?
  11. A body moves in a circle of radius 10 m at 20 m/s. What is its centripetal acceleration?
  12. A 10 kg load hangs 0.5 m from the pivot of a light uniform lever. What force at 4 m on the other side of the pivot balances it? (take g = 10 m/s²)
  13. A body moving at 14 m/s accelerates uniformly at 7 m/s² for 4 s. What is its final speed?
  14. What force gives a mass of 16 kg an acceleration of 5 m/s²?
  15. What is the kinetic energy of a 5 kg body moving at 10 m/s?
  16. How much gravitational potential energy does a 5 kg mass gain when lifted 2 m? (take g = 10 m/s²)
  17. A force of 20 N acts at 60° to the horizontal and moves a body 13 m along the horizontal. How much work does it do?
  18. A force of 400 N acts on an area of 0.2 m². What pressure does it exert?
  19. A wave has a frequency of 500 Hz and a wavelength of 0.2 m. What is its speed?
  20. A source vibrates with a frequency of 20 Hz. What is its period?
  21. What is the period of a simple pendulum of length 0.4 m? (take g = 10 m/s²)
  22. A resistor of 6 Ω carries a current of 3 A. What is the potential difference across it?
  23. A device on a 220 V supply draws 2 A. What is its power?

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