Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 294 · 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.True or false: if the loop is complete, the circuit is closed and current flows. (a) True (b) False
2. 2.🔦 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 metal paper clip. Does the bulb glow? (a) Yes (b) No
3. 3.⚡ What does a mixer grinder mainly change electricity into? (a) heat (b) movement (c) sound (d) light
4. 4.⚠️ Why must we never touch switches with wet hands? (a) it is just untidy (b) it spoils the paint (c) water carries current (d) water makes it cold
5. 5.🔁 What must there be for a current to flow? (a) a complete loop (b) a plastic gap (c) a broken path (d) one loose end
6. 6.🔌 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
7. 7.Which of these is a conductor? (a) a steel coin (b) a paper strip (c) a dry cork (d) a woollen thread
8. 8.True or false: “bulbs share the voltage” is true of a series circuit. (a) True (b) False
9. 9.True or false: a reed switch closes near a magnet. (a) False (b) True
10. 10.Which of these is an insulator? (a) a copper wire (b) a safety pin (c) a brass key (d) a ceramic cup
11. 11.🔌 Is a wooden stick a conductor or an insulator? (a) an insulator (b) a conductor
12. 12.🔌 Is a plastic ruler a conductor or an insulator? (a) a conductor (b) an insulator
13. 13.🔘 Which kind of switch slides side to side? (a) a push button (b) a slide switch (c) a tilt switch (d) a toggle switch
14. 14.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) never (b) only when both are OFF (c) when either is ON (d) only when both are ON
15. 15.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
16. 16.True or false: to climb an electric pole is not safe. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) an iron nail (b) a brass key (c) a woollen thread (d) a steel coin
18. 18.✏️ In a circuit diagram, which part is drawn as triangle, bar and arrows? (a) voltmeter (b) diode (c) LED (d) cell
19. 19.✏️ In a circuit diagram, wires are usually drawn as … (a) wavy lines (b) little stars (c) dotted circles (d) straight lines
20. 20.⚠️ About how many volts do home sockets in India supply? (a) 12 V (b) 9 V (c) 230 V (d) 1.5 V
21. 21.Which of these mainly makes movement? (a) a room heater (b) a torch (c) an electric toy car (d) a street light
22. 22.Which of these mainly gives out heat? (a) a torch (b) a night lamp (c) a tube light (d) an electric iron
23. 23.🔘 Which kind of switch springs back when let go? (a) a tilt switch (b) a reed switch (c) a slide switch (d) a push button
24. 24.🔍 Which is the odd one out? (a) use a cable with cuts (b) fly kites in open fields (c) use mains for a project (d) throw cells in a fire
25. 25.🔋 How many 1.5 V cells must be joined in series to give 3 V?
26. 26.🔋 5 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
27. 27.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a woollen thread across the gap. Does the bulb glow? (a) No (b) Yes
28. 28.🔌 Is a copper wire a conductor or an insulator? (a) an insulator (b) a conductor
29. 29.Which of these gives us electricity? (a) a generator (b) a television (c) a refrigerator (d) an air conditioner
30. 30.⚡ What does a rice cooker mainly change electricity into? (a) light (b) heat (c) movement (d) sound
31. 31.Which drawing is the symbol for a bulb? (a) a dot where wires meet (b) two equal parallel lines (c) a circle with a cross (d) a long and a short line
32. 32.Which of these is safe? (a) take cells out after use (b) open a phone charger (c) touch a switch when wet (d) use mains for a project
33. 33.True or false: a straight line is the symbol for a wire. (a) True (b) False
34. 34.🔘 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 ON and C is ON. Does the bulb glow? (a) No (b) Yes
35. 35.💡 3 identical bulbs are in parallel and each one takes 1 A. What total current (in amperes) comes from the battery? =
36. 36.💡 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
37. 37.🔍 Which is the odd one out? (a) a brass key (b) a glass marble (c) a plastic ruler (d) a rubber band
38. 38.⚠️ Is it safe to use small battery cells? (a) safe (b) not safe
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. Bulb 5 is taken out of its holder. Does bulb 4 glow? (a) No (b) Yes
40. 40.True or false: a table fan mainly makes sound. (a) True (b) False

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