National 5 (Scotland) · National 5 Physics

Space and Electricity

15 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 15 questions

  1. What is a light year?
  2. The Sun is 1.5 × 10¹¹ m from Earth and light travels at 3.0 × 10⁸ m/s. How long does sunlight take to reach Earth?
  3. Light from distant galaxies is red-shifted. What does this suggest about the Universe?
  4. What can an astronomer learn from the line spectrum of a star?
  5. What nuclear process releases the energy of the Sun?
  6. A geostationary satellite orbits the Earth once every how long?
  7. A flash of lightning is seen and the thunder is heard 3.0 s later. The speed of sound is 340 m/s. How far away is the storm?
  8. A current of 3.0 A flows for 20 s. How much charge passes?
  9. A 12 V supply is connected across a 4 Ω resistor. What is the current?
  10. Three resistors of 2 Ω, 4 Ω and 6 Ω are connected in series. What is the total resistance?
  11. Two resistors of 6 Ω and 3 Ω are connected in parallel. What is the total resistance?
  12. A mains appliance operates at 230 V and draws 5.0 A. What is its power?
  13. A 2.0 kW heater is switched on for 30 minutes. How much energy does it transfer?
  14. A 6 Ω resistor is connected across a 12 V supply. What power is dissipated?
  15. Two resistors of 2 kΩ and 3 kΩ are in series across a 10 V supply. What is the voltage across the 3 kΩ resistor?

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