MDCAT Pakistan · Physics

Mechanics, Work, Energy and Fluids

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 force gives a mass of 13 kg an acceleration of 9 m/s²?
  2. What is the kinetic energy of a 5 kg body moving at 12 m/s?
  3. How much gravitational potential energy does a 10 kg mass gain when lifted 24 m? (take g = 10 m/s²)
  4. A force of 40 N acts at 60° to the horizontal and moves a body 10 m along the horizontal. How much work does it do?
  5. A machine does 600 J of work in 20 s. What is its power?
  6. A force of 400 N acts on an area of 0.5 m². What pressure does it exert?
  7. A spring of constant 800 N/m is stretched by 0.05 m. How much energy is stored in it?
  8. A resistor of 2 Ω carries a current of 0.5 A. What is the potential difference across it?
  9. Two resistors of 6 Ω and 3 Ω are connected in parallel. What is their combined resistance?
  10. How much energy in kWh does a 3000 W heater use in 5 hours?
  11. A 10 μF capacitor is charged to 10 V. How much charge does it store?
  12. A transformer has 100 turns on the primary coil and 500 turns on the secondary. The primary voltage is 230 V. What is the secondary voltage?
  13. How much heat is needed to warm 0.5 kg of water by 50 °C? (specific heat capacity of water = 4200 J/(kg °C))
  14. A gas in a rigid container is at 300 kPa and 400 K. It is cooled to 200 K. What is the new pressure?
  15. A body moves in a circle of radius 5 m at 30 m/s. What is its centripetal acceleration?
  16. A body of volume 0.01 m³ is fully immersed in a liquid of density 1200 kg/m³. What is the upthrust? (take g = 10 m/s²)
  17. A body moving at 8 m/s accelerates uniformly at 3 m/s² for 7 s. What is its final speed?
  18. What force gives a mass of 3 kg an acceleration of 2 m/s²?
  19. What is the kinetic energy of a 4 kg body moving at 12 m/s?
  20. How much gravitational potential energy does a 10 kg mass gain when lifted 3 m? (take g = 10 m/s²)
  21. A force of 100 N acts at 60° to the horizontal and moves a body 5 m along the horizontal. How much work does it do?
  22. A machine takes in 400 J of energy and gives out 100 J of useful work. What is its efficiency?
  23. A force of 200 N acts on an area of 0.5 m². What pressure does it exert?

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