Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 713 · 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.🔁 What do we call a circuit with a break in it? (a) a series circuit (b) a full circuit (c) a closed circuit (d) an open circuit
2. 2.💡 3 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 3 are taken out of their holders. How many bulbs glow?
3. 3.True or false: if the switch is OFF, the circuit is open and no current flows. (a) False (b) True
4. 4.🔋 How many 1.2 V cells must be joined in series to give 8.4 V?
5. 5.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) True (b) False
6. 6.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
7. 7.Which of these is a conductor? (a) a steel spoon (b) a plastic straw (c) a rubber eraser (d) a wooden stick
8. 8.🔗 Series or parallel circuit: “one out, the rest glow”? (a) parallel (b) series
9. 9.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
10. 10.True or false: a toggle switch stays where you flip it. (a) True (b) False
11. 11.Which of these gives us electricity? (a) a mobile phone (b) a generator (c) a television (d) a refrigerator
12. 12.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a brass key across the gap. Does the bulb glow? (a) No (b) Yes
13. 13.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) a wire has come loose (c) a wire is cut (d) all wires are joined
14. 14.🔌 Is a graphite rod a conductor or an insulator? (a) an insulator (b) a conductor
15. 15.🔗 Series or parallel circuit: “a break stops every bulb”? (a) parallel (b) series
16. 16.💡 A battery lights 4 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) dimmer (c) brighter
17. 17.🔍 Which is the odd one out? (a) touch a fallen wire (b) build with an adult near (c) dry your hands first (d) stay away from pylons
18. 18.🔋 A 3 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
19. 19.⚠️ Is it safe to stop if a part gets hot? (a) not safe (b) safe
20. 20.🔌 Why are electric wires covered in plastic? (a) to make them heavy (b) plastic is an insulator (c) plastic is a conductor (d) plastic makes current
21. 21.True or false: on a cell, “the flat end” means the + (positive) end. (a) True (b) False
22. 22.💡 Why is house wiring done in parallel? (a) to save copper only (b) to make bulbs dim (c) each gets full voltage (d) so all go off together
23. 23.True or false: a toggle switch flips up or down. (a) True (b) False
24. 24.⚡ What does a mixer grinder mainly change electricity into? (a) sound (b) movement (c) light (d) heat
25. 25.🔌 Most metals are good … (a) insulators (b) conductors (c) magnets only (d) batteries
26. 26.Which of these is an insulator? (a) a safety pin (b) a cotton thread (c) an iron nail (d) aluminium foil
27. 27.💡 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
28. 28.🔋 What is a battery? (a) one single wire (b) a switch with a lid (c) two or more cells joined (d) a kind of bulb
29. 29.🔗 Series or parallel circuit: “own switch for each bulb”? (a) series (b) parallel
30. 30.💡 6 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?
31. 31.True or false: aluminium foil is a conductor. (a) False (b) True
32. 32.True or false: triangle, bar and arrows is the symbol for a bulb. (a) False (b) True
33. 33.Which of these mainly gives out light? (a) a loudspeaker (b) a toaster (c) a water heater (d) a street light
34. 34.Which of these means the circuit is open? (a) the loop is complete (b) all wires are joined (c) the switch is ON (d) the switch is OFF
35. 35.True or false: aluminium foil is an insulator. (a) False (b) True
36. 36.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
37. 37.Which drawing is the symbol for a cell? (a) triangle against a bar (b) a line lifted at a gap (c) a plain rectangle (d) a long and a short line
38. 38.🔁 Is the circuit closed or open if the loop is complete? (a) open (b) closed
39. 39.🔋 3 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)? =
40. 40.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is OFF and B is OFF. Does the bulb glow? (a) No (b) Yes

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