Scottish Highers · Higher Physics

Electricity and Further Mechanics

17 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 17 questions

  1. A cell of EMF 6.0 V and internal resistance 0.50 Ω supplies a current of 2.0 A. What is the terminal potential difference?
  2. A battery has EMF 12 V. When it supplies 3.0 A the terminal p.d. is 10.5 V. What is the internal resistance?
  3. A 470 µF capacitor is charged to 12 V. How much charge is stored?
  4. How much energy is stored in a 470 µF capacitor charged to 12 V?
  5. The mains supply has an r.m.s. voltage of 230 V. What is the peak voltage?
  6. Which type of semiconductor is made by doping silicon with phosphorus, which has five outer electrons?
  7. What happens in a forward-biased LED?
  8. The frequency of a siren is 700 Hz. It moves towards a stationary observer at 25 m/s. The speed of sound is 340 m/s. What frequency is heard?
  9. A 5.0 kg block slides down a frictionless slope of 30° to the horizontal. What is its acceleration? ( m/s²)
  10. Which statement about a conductor, a semiconductor and an insulator is correct?
  11. A 12 V supply is connected to a resistor R in series with a thermistor. What happens to the voltage across R when the thermistor's temperature rises?
  12. A satellite orbits the Earth in a circular orbit. Which statement is correct?
  13. Which of the following is a fundamental particle?
  14. A stone is dropped from rest and falls for 2.0 s. Ignoring air resistance, how far does it fall? ( m/s²)
  15. A rocket motor ejects 2.0 kg of gas per second at 500 m/s. What is the thrust?
  16. What is the unit of the electric field strength?
  17. An electron is accelerated from rest through a potential difference of 200 V. How much kinetic energy does it gain, in joules? ( C)

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