Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 101 · 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.🔋 How many 1.2 V cells must be joined in series to give 7.2 V?
2. 2.True or false: an electric toy car mainly gives out light. (a) True (b) False
3. 3.True or false: to poke things in a socket is safe. (a) True (b) False
4. 4.Which of these is safe? (a) climb an electric pole (b) dry your hands first (c) touch a switch when wet (d) use a cable with cuts
5. 5.True or false: a toggle switch closes near a magnet. (a) False (b) True
6. 6.💡 Why is house wiring done in parallel? (a) to make bulbs dim (b) so all go off together (c) each gets full voltage (d) to save copper only
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 a rubber eraser. Does the bulb glow? (a) No (b) Yes
8. 8.Which of these is a conductor? (a) a plastic straw (b) a ceramic cup (c) a rubber band (d) an iron nail
9. 9.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in parallel (b) in series (c) by Wi-Fi (d) not joined
10. 10.🔗 Series or parallel circuit: “many paths for current”? (a) parallel (b) series
11. 11.🔌 Which part of a screwdriver should an electrician hold? (a) the metal tip (b) the steel shaft (c) the bare end (d) the plastic handle
12. 12.True or false: to throw cells in a fire is not safe. (a) True (b) False
13. 13.💡 4 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. Bulb 1 is taken out of its holder. How many bulbs glow?
14. 14.🔁 Is the circuit closed or open if a wire has come loose? (a) closed (b) open
15. 15.Which of these means the circuit is closed? (a) a wire is cut (b) all wires are joined (c) the switch is OFF (d) a wire has come loose
16. 16.🔘 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 ON and B is OFF. Does the bulb glow? (a) Yes (b) No
17. 17.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) False (b) True
18. 18.True or false: “a single current path” is true of a parallel circuit. (a) True (b) False
19. 19.Which of these is a conductor? (a) a wooden stick (b) a cotton thread (c) a steel spoon (d) a glass marble
20. 20.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they explode (b) they all go out (c) they get dimmer (d) they keep glowing
21. 21.✏️ In a circuit diagram, which part is drawn as a dot where wires meet? (a) junction (b) switch (c) cell (d) diode
22. 22.True or false: an electric iron mainly makes sound. (a) True (b) False
23. 23.🔘 Two switches are in series. When does the bulb glow? (a) when both are ON (b) when either is ON (c) never (d) when both are OFF
24. 24.⚡ What does a torch mainly change electricity into? (a) heat (b) sound (c) light (d) movement
25. 25.Which of these means the circuit is closed? (a) the loop is complete (b) a wire is cut (c) the bulb is unscrewed (d) a wire has come loose
26. 26.🔘 Which kind of switch springs back when let go? (a) a tilt switch (b) a reed switch (c) a push button (d) a toggle switch
27. 27.What does a reed switch do? (a) flips up or down (b) closes when tipped over (c) works only while pressed (d) closes near a magnet
28. 28.Which of these is an insulator? (a) a steel coin (b) a glass marble (c) a copper wire (d) an iron nail
29. 29.True or false: to stop if a part gets hot is not safe. (a) False (b) True
30. 30.🔁 Is the circuit closed or open if the loop is complete? (a) open (b) closed
31. 31.Which of these gives us electricity? (a) a washing machine (b) a refrigerator (c) a battery (d) a television
32. 32.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is ON, B is OFF and C is OFF. Does the bulb glow? (a) No (b) Yes
33. 33.Which drawing is the symbol for a battery? (a) two equal parallel lines (b) a circle with an X in it (c) many long-short pairs (d) a dot where wires meet
34. 34.True or false: on a cell, “the shorter symbol line” means the − (negative) end. (a) False (b) True
35. 35.True or false: “each gets the full volts” is true of a parallel circuit. (a) False (b) True
36. 36.💡 2 identical bulbs are joined in series with a 6 V battery (ideal wires). How many volts does each bulb get? =
37. 37.Which of these is safe? (a) use small battery cells (b) open a phone charger (c) touch a switch when wet (d) use a cable with cuts
38. 38.💡 4 identical bulbs are in parallel and each bulb has its own switch on its path. 1 of the switches is OFF and the rest are ON. How many bulbs glow?
39. 39.🔘 Which kind of switch works only while pressed? (a) a reed switch (b) a toggle switch (c) a push button (d) a tilt switch
40. 40.⚠️ Is it safe to use small battery cells? (a) safe (b) not safe

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