Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 19 · 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.⚠️ Why must we never touch switches with wet hands? (a) water makes it cold (b) it spoils the paint (c) it is just untidy (d) water carries current
2. 2.Which of these means the circuit is open? (a) the loop is complete (b) the switch is ON (c) a wire is cut (d) all wires are joined
3. 3.True or false: if a wire has come loose, the circuit is closed and current flows. (a) False (b) True
4. 4.⚠️ Is it safe to climb an electric pole? (a) safe (b) not safe
5. 5.True or false: an electric kettle mainly gives out heat. (a) False (b) True
6. 6.True or false: if a cell is taken out, the circuit is open and no current flows. (a) True (b) False
7. 7.🔦 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 an iron nail. Does the bulb glow? (a) Yes (b) No
8. 8.True or false: a circle with a cross is the symbol for a diode. (a) True (b) False
9. 9.🔌 Most metals are good … (a) insulators (b) conductors (c) batteries (d) magnets only
10. 10.True or false: “own switch for each bulb” is true of a parallel circuit. (a) False (b) True
11. 11.True or false: if all wires are joined, the circuit is open and no current flows. (a) True (b) False
12. 12.What does a reed switch do? (a) works only while pressed (b) stays where you flip it (c) closes when tipped over (d) closes near a magnet
13. 13.True or false: to open a phone charger is not safe. (a) True (b) False
14. 14.True or false: “own switch for each bulb” is true of a series circuit. (a) False (b) True
15. 15.🔁 Is the circuit closed or open if the switch is OFF? (a) closed (b) open
16. 16.⚠️ Is it safe to poke things in a socket? (a) safe (b) not safe
17. 17.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) wire (b) voltmeter (c) LED (d) ammeter
18. 18.True or false: a tilt switch closes when tipped over. (a) False (b) True
19. 19.🔋 A 9 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
20. 20.⚠️ Is it safe to dry your hands first? (a) safe (b) not safe
21. 21.🔗 Series or parallel circuit: “a break stops every bulb”? (a) series (b) parallel
22. 22.🔘 A cell and a bulb are joined to 2 side-by-side paths with one switch on each path — A and B (parallel). A is OFF and B is OFF. Does the bulb glow? (a) Yes (b) No
23. 23.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) cell (b) resistor (c) capacitor (d) voltmeter
24. 24.🔍 Which is the odd one out? (a) dry your hands first (b) throw cells in a fire (c) poke things in a socket (d) touch a switch when wet
25. 25.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) in series (c) in parallel (d) not joined
26. 26.🔘 A bulb and a cell are joined through 5 switches on 5 side-by-side paths, one switch on each path (parallel). What is the smallest number of switches that must be ON to light the bulb?
27. 27.💡 Why is house wiring done in parallel? (a) so all go off together (b) to make bulbs dim (c) to save copper only (d) each gets full voltage
28. 28.🔋 4 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
29. 29.🔋 4 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)? =
30. 30.🔋 5 identical 2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
31. 31.🔦 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) Yes (b) No
32. 32.True or false: a glass marble is an insulator. (a) False (b) True
33. 33.🔋 Does a mobile phone give electricity or use electricity? (a) uses electricity (b) gives electricity
34. 34.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a wooden stick. Does the bulb glow? (a) No (b) Yes
35. 35.True or false: on a cell, “usually the black wire” means the − (negative) end. (a) False (b) True
36. 36.🔋 How many 1.2 V cells must be joined in series to give 7.2 V?
37. 37.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) quick and clear for all (c) to make it colourful (d) to hide the circuit
38. 38.True or false: if all wires are joined, the circuit is closed and current flows. (a) False (b) True
39. 39.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) switch (b) ammeter (c) resistor (d) cell
40. 40.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) voltmeter (b) junction (c) switch (d) bulb

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