Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 9 · 40 questions

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.

1. 1.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in parallel (b) by Wi-Fi (c) in series (d) not joined
2. 2.🔌 Why are electric wires covered in plastic? (a) plastic makes current (b) plastic is a conductor (c) to make them heavy (d) plastic is an insulator
3. 3.What does a toggle switch do? (a) works only while pressed (b) slides side to side (c) stays where you flip it (d) springs back when let go
4. 4.🔋 2 identical 1.5 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
5. 5.⚡ A fan changes electrical energy mainly into which kind of energy? (a) chemical energy (b) sound energy (c) light energy (d) movement energy
6. 6.🔋 2 identical 1.2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
7. 7.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a wooden stick across the gap. Does the bulb glow? (a) No (b) Yes
8. 8.Which of these uses electricity? (a) a battery (b) a television (c) a cell (d) a solar panel
9. 9.True or false: a reed switch closes when tipped over. (a) True (b) False
10. 10.🔗 Series or parallel circuit: “own switch for each bulb”? (a) parallel (b) series
11. 11.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a plastic ruler across the gap. Does the bulb glow? (a) Yes (b) No
12. 12.⚡ What does a traffic signal mainly change electricity into? (a) sound (b) movement (c) light (d) heat
13. 13.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by an iron nail. Does the bulb glow? (a) Yes (b) No
14. 14.True or false: an iron nail is an insulator. (a) False (b) True
15. 15.✏️ Why do engineers draw circuits with symbols? (a) to make it colourful (b) quick and clear for all (c) symbols are heavier (d) to hide the circuit
16. 16.Which of these is an insulator? (a) a dry cork (b) a safety pin (c) a brass key (d) a graphite rod
17. 17.⚡ What does a room heater mainly change electricity into? (a) sound (b) movement (c) heat (d) light
18. 18.True or false: if the bulb is unscrewed, the circuit is closed and current flows. (a) True (b) False
19. 19.True or false: an electric toy car mainly gives out light. (a) True (b) False
20. 20.⚡ What does a street light mainly change electricity into? (a) light (b) sound (c) movement (d) heat
21. 21.🔋 Does a solar panel give electricity or use electricity? (a) uses electricity (b) gives electricity
22. 22.Which of these is safe? (a) open a phone charger (b) touch a switch when wet (c) climb an electric pole (d) keep drinks far away
23. 23.Which of these means the circuit is closed? (a) a cell is taken out (b) a wire is cut (c) the bulb is unscrewed (d) the loop is complete
24. 24.⚠️ Is it safe to use a cable with cuts? (a) safe (b) not safe
25. 25.True or false: to use mains for a project is not safe. (a) False (b) True
26. 26.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) + (positive) (b) − (negative)
27. 27.🔌 Is a brass key a conductor or an insulator? (a) a conductor (b) an insulator
28. 28.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 4 is taken out of its holder. How many bulbs glow?
29. 29.🔍 Which is the odd one out? (a) a torch (b) an electric toy car (c) a ceiling fan (d) a mixer grinder
30. 30.🔋 3 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
31. 31.🔋 How many 1.2 V cells must be joined in series to give 3.6 V?
32. 32.⚠️ Why must we never touch switches with wet hands? (a) water makes it cold (b) it spoils the paint (c) water carries current (d) it is just untidy
33. 33.Which drawing is the symbol for a diode? (a) triangle, bar and arrows (b) one tall, one short bar (c) a circle with an X in it (d) triangle against a bar
34. 34.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) True (b) False
35. 35.⚡ A solar panel changes which kind of energy into electricity? (a) wind energy (b) light energy (c) sound energy (d) chemical energy
36. 36.⚡ What do we call a flow of electric charge through a wire? (a) electric current (b) sound (c) friction (d) a magnet
37. 37.Which of these is an insulator? (a) a graphite rod (b) a wooden stick (c) a steel spoon (d) a safety pin
38. 38.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) two (c) none (d) one
39. 39.💡 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 4 and 5 are taken out of their holders. How many bulbs glow?
40. 40.🔦 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

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