Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 705 · 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.Which of these is an insulator? (a) aluminium foil (b) a brass key (c) a steel spoon (d) a dry cork
2. 2.💡 5 identical bulbs are joined in series with a 20 V battery (ideal wires). How many volts does each bulb get? =
3. 3.⚠️ Is it safe to throw cells in a fire? (a) not safe (b) safe
4. 4.⚠️ Is it safe to fly a kite near wires? (a) safe (b) not safe
5. 5.🔌 Is an iron nail a conductor or an insulator? (a) a conductor (b) an insulator
6. 6.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
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.🔋 Identical cells side by side (in parallel) give … (a) double the voltage (b) half the voltage (c) the same voltage (d) no voltage
9. 9.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) not joined (c) in series (d) in parallel
10. 10.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
11. 11.🔌 Which metal is used for most electric wires at home? (a) rubber (b) plastic (c) glass (d) copper
12. 12.Which of these is safe? (a) climb an electric pole (b) poke things in a socket (c) touch a switch when wet (d) take cells out after use
13. 13.🔘 A bulb and a cell are joined through 4 switches on 4 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?
14. 14.🔋 3 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)? =
15. 15.🔋 How many 1.5 V cells must be joined in series to give 4.5 V?
16. 16.🔁 Is the circuit closed or open if all wires are joined? (a) open (b) closed
17. 17.Which of these is true of a series circuit? (a) a single current path (b) each gets the full volts (c) own switch for each bulb (d) one out, the rest glow
18. 18.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a plastic straw across the gap. Does the bulb glow? (a) No (b) Yes
19. 19.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) the switch is ON (c) a wire has come loose (d) a wire is cut
20. 20.🔋 Does a generator give electricity or use electricity? (a) uses electricity (b) gives electricity
21. 21.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
22. 22.🔍 Which is the odd one out? (a) a metal paper clip (b) a rubber band (c) a plastic straw (d) a rubber eraser
23. 23.Which of these mainly makes movement? (a) a toaster (b) a street light (c) an electric drill (d) a school bell
24. 24.🔍 Which is the odd one out? (a) a ceramic cup (b) a steel coin (c) a rubber band (d) a wooden stick
25. 25.🔋 8 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
26. 26.🔘 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 OFF, B is ON and C is ON. Does the bulb glow? (a) Yes (b) No
27. 27.True or false: “a single current path” is true of a series circuit. (a) True (b) False
28. 28.🔌 Is a brass key a conductor or an insulator? (a) a conductor (b) an insulator
29. 29.🔋 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)? =
30. 30.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
31. 31.✏️ In a circuit diagram, which part is drawn as a circle with V inside? (a) voltmeter (b) switch (c) junction (d) bulb
32. 32.True or false: an electric toy car mainly makes movement. (a) True (b) False
33. 33.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a metal paper clip across the gap. Does the bulb glow? (a) No (b) Yes
34. 34.True or false: a safety pin is an insulator. (a) True (b) False
35. 35.🔋 How many volts does one ordinary torch cell give? (a) 15 V (b) 230 V (c) 0.5 V (d) 1.5 V
36. 36.✏️ In a circuit diagram, which part is drawn as triangle against a bar? (a) voltmeter (b) cell (c) diode (d) resistor
37. 37.⚠️ Is it safe to stop if a part gets hot? (a) not safe (b) safe
38. 38.💡 Why is house wiring done in parallel? (a) to save copper only (b) to make bulbs dim (c) so all go off together (d) each gets full voltage
39. 39.🔘 A cell, a bulb and switches A, B and C are joined one after another in a single loop (series). A is ON, B is ON and C is OFF. Does the bulb glow? (a) No (b) Yes
40. 40.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put an iron nail across the gap. Does the bulb glow? (a) No (b) Yes

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