MDCAT Pakistan · Physics

Electricity, Magnetism and Atomic Physics

24 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 24 questions

  1. A 4 μF capacitor is charged to 6 V. How much charge does it store?
  2. A wire 0.2 m long carries 2 A at right angles to a magnetic field of 0.5 T. What force acts on it?
  3. A transformer has 100 turns on the primary coil and 2000 turns on the secondary. The primary voltage is 230 V. What is the secondary voltage?
  4. An object is placed 60 cm from a convex lens of focal length 15 cm. How far from the lens is the image?
  5. A body moves in a circle of radius 50 m at 10 m/s. What is its centripetal acceleration?
  6. A stone is dropped from a height of 125 m. How long does it take to reach the ground? (take g = 10 m/s²)
  7. A body of volume 0.001 m³ is fully immersed in a liquid of density 1200 kg/m³. What is the upthrust? (take g = 10 m/s²)
  8. A body moving at 2 m/s accelerates uniformly at 7 m/s² for 6 s. What is its final speed?
  9. What force gives a mass of 7 kg an acceleration of 2 m/s²?
  10. What is the kinetic energy of a 4 kg body moving at 9 m/s?
  11. How much gravitational potential energy does a 10 kg mass gain when lifted 17 m? (take g = 10 m/s²)
  12. A force of 40 N acts at 60° to the horizontal and moves a body 2 m along the horizontal. How much work does it do?
  13. A machine does 4500 J of work in 30 s. What is its power?
  14. A machine takes in 800 J of energy and gives out 200 J of useful work. What is its efficiency?
  15. A force of 600 N acts on an area of 0.1 m². What pressure does it exert?
  16. A resistor of 4 Ω carries a current of 5 A. What is the potential difference across it?
  17. Two resistors of 20 Ω and 5 Ω are connected in parallel. What is their combined resistance?
  18. A device on a 110 V supply draws 2 A. What is its power?
  19. Two point charges of 4 μC and 5 μC are 0.6 m apart in air. What is the force between them? (k = 9 × 10⁹ N m²/C²)
  20. A 4 μF capacitor is charged to 20 V. How much charge does it store?
  21. A wire 0.5 m long carries 2 A at right angles to a magnetic field of 2 T. What force acts on it?
  22. A transformer has 1000 turns on the primary coil and 20000 turns on the secondary. The primary voltage is 230 V. What is the secondary voltage?
  23. How much heat is needed to warm 5 kg of water by 10 °C? (specific heat capacity of water = 4200 J/(kg °C))
  24. A gas in a rigid container is at 100 kPa and 250 K. It is cooled to 125 K. What is the new pressure?

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