Saudi Secondary School Certificate · Advanced Physics and Chemistry

Electricity, waves and modern physics

16 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 16 questions

  1. Two point charges exert a force F on each other. One charge is multiplied by 3, the other by 3, and the separation is multiplied by 3. What is the new force?
  2. A conducting rod 0.4 m long moves at 5 m/s perpendicular to a magnetic field of 0.4 T. What e.m.f. is induced?
  3. A series circuit has R = 12 ohm, inductive reactance 20 ohm and capacitive reactance 4 ohm. What is the impedance?
  4. A series circuit has R = 20 ohm, inductive reactance 35 ohm and capacitive reactance 20 ohm. What is the impedance?
  5. A series circuit has R = 15 ohm, inductive reactance 25 ohm and capacitive reactance 5 ohm. What is the impedance?
  6. A series circuit has R = 60 ohm, inductive reactance 100 ohm and capacitive reactance 20 ohm. What is the impedance?
  7. A series circuit has R = 30 ohm, inductive reactance 50 ohm and capacitive reactance 10 ohm. What is the impedance?
  8. Light with photon energy 12 eV shines on a metal with a work function of 2 eV. What is the maximum kinetic energy of the photoelectrons?
  9. Light with photon energy 7 eV shines on a metal with a work function of 3 eV. What is the maximum kinetic energy of the photoelectrons?
  10. A radioactive isotope has a half-life of 5 days. What fraction of a sample remains after 25 days?
  11. A stone is thrown horizontally at 14 m/s from a height of 20 m (g = 10 m/s squared). How far does it land from the base of the cliff?
  12. A stone is thrown horizontally at 13 m/s from a height of 45 m (g = 10 m/s squared). How far does it land from the base of the cliff?
  13. A stone is thrown horizontally at 8 m/s from a height of 80 m (g = 10 m/s squared). How far does it land from the base of the cliff?
  14. A stone is thrown horizontally at 12 m/s from a height of 20 m (g = 10 m/s squared). How far does it land from the base of the cliff?
  15. A fixed mass of gas has volume 9 L at 2 atm and 300 K. What is its volume at 3 atm and 600 K?
  16. A fixed mass of gas has volume 12 L at 2 atm and 300 K. What is its volume at 1 atm and 450 K?

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