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Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 702 · 40 questions
TalentJR

Remember (Find the topic, use the idea): Find the topic: energy, safety, conductor, closed loop, switches, cells, symbols, series or parallel. Use that lesson’s idea — complete loop, all ON for series, cells add up, one path or many. For sums, write the working and check it again.

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  1. 1.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
  2. 2.True or false: if the switch is ON, the circuit is closed and current flows. (a) True (b) False
  3. 3.🔁 Is the circuit closed or open if all wires are joined? (a) closed (b) open
  4. 4.⚠️ Is it safe to touch a switch when wet? (a) safe (b) not safe
  5. 5.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
  6. 6.Which of these is an insulator? (a) a steel spoon (b) a wooden stick (c) a copper wire (d) a safety pin
  7. 7.Which of these mainly makes sound? (a) a room heater (b) a street light (c) a mixer grinder (d) a doorbell
  8. 8.True or false: an LED lamp mainly gives out light. (a) True (b) False
  9. 9.⚡ Which tiny particles drift along a metal wire to carry the current? (a) water drops (b) dust particles (c) electrons (d) photons
  10. 10.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) False (b) True
  11. 11.True or false: a circle with an X in it is the symbol for a bulb. (a) False (b) True
  12. 12.Which of these is safe? (a) touch a switch when wet (b) touch a fallen wire (c) fly a kite near wires (d) dry your hands first
  13. 13.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) the longer line (c) neither line (d) both lines
  14. 14.🔋 A 12 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
  15. 15.🔗 Series or parallel circuit: “many paths for current”? (a) series (b) parallel
  16. 16.Which of these means the circuit is closed? (a) a wire has come loose (b) the bulb is unscrewed (c) the switch is OFF (d) the switch is ON
  17. 17.Which of these is safe? (a) touch a switch when wet (b) use mains for a project (c) open a phone charger (d) stop if a part gets hot
  18. 18.Which of these is a conductor? (a) a plastic straw (b) a cotton thread (c) a rubber eraser (d) aluminium foil
  19. 19.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
  20. 20.⚠️ Is it safe to touch a fallen wire? (a) not safe (b) safe
  21. 21.⚡ What does a night lamp mainly change electricity into? (a) light (b) movement (c) sound (d) heat
  22. 22.⚡ What does a siren mainly change electricity into? (a) heat (b) movement (c) sound (d) light
  23. 23.What does a tilt switch do? (a) stays where you flip it (b) closes when tipped over (c) closes near a magnet (d) works only while pressed
  24. 24.Which of these means the circuit is open? (a) the switch is ON (b) the loop is complete (c) all wires are joined (d) a wire is cut
  25. 25.True or false: to touch a switch when wet is not safe. (a) True (b) False
  26. 26.💡 5 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulbs 1 and 5 are taken out of their holders. How many bulbs glow?
  27. 27.🔌 Is a dry cork a conductor or an insulator? (a) an insulator (b) a conductor
  28. 28.True or false: a plain rectangle is the symbol for a resistor. (a) True (b) False
  29. 29.🔘 What does a switch do in a circuit? (a) changes the voltage (b) opens or closes the loop (c) makes electricity (d) stores current
  30. 30.🔋 How many volts does one ordinary torch cell give? (a) 230 V (b) 1.5 V (c) 0.5 V (d) 15 V
  31. 31.💡 Why is house wiring done in parallel? (a) to make bulbs dim (b) to save copper only (c) so all go off together (d) each gets full voltage
  32. 32.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a steel spoon. Does the bulb glow? (a) No (b) Yes
  33. 33.🔌 Which metal is used for most electric wires at home? (a) plastic (b) rubber (c) copper (d) glass
  34. 34.🔘 When a switch is ON, the circuit is … (a) broken (b) cut (c) open (d) closed
  35. 35.🔍 Which is the odd one out? (a) a rubber eraser (b) a plastic straw (c) an iron nail (d) a wooden stick
  36. 36.⚡ What do we call a flow of electric charge through a wire? (a) electric current (b) sound (c) a magnet (d) friction
  37. 37.True or false: an exhaust fan mainly makes movement. (a) False (b) True
  38. 38.True or false: to touch a fallen wire is not safe. (a) False (b) True
  39. 39.True or false: to use a cable with cuts is not safe. (a) True (b) False
  40. 40.True or false: a circle with V inside is the symbol for a voltmeter. (a) False (b) True

Answer key

  1. True
  2. True
  3. closed
  4. not safe
  5. + (positive)
  6. a wooden stick
  7. a doorbell
  8. True
  9. electrons
  10. False
  11. True
  12. dry your hands first
  13. the longer line
  14. 18
  15. parallel
  16. the switch is ON
  17. stop if a part gets hot
  18. aluminium foil
  19. + (positive)
  20. not safe
  21. light
  22. sound
  23. closes when tipped over
  24. a wire is cut
  25. True
  26. 3
  27. an insulator
  28. True
  29. opens or closes the loop
  30. 1.5 V
  31. each gets full voltage
  32. Yes
  33. copper
  34. closed
  35. an iron nail
  36. electric current
  37. True
  38. True
  39. True
  40. True

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