Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 417 · 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.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) not joined (b) in series (c) by Wi-Fi (d) in parallel
2. 2.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) none (b) only one (c) both of them (d) it does not matter
3. 3.True or false: “one out, the rest glow” is true of a parallel circuit. (a) True (b) False
4. 4.💡 3 identical bulbs are joined in parallel across a 3 V battery (ideal wires). How many volts does each bulb get? =
5. 5.🔘 A bulb and a cell are joined through 6 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
6. 6.🔦 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
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 cotton thread. Does the bulb glow? (a) No (b) Yes
8. 8.🔍 Which is the odd one out? (a) touch a switch when wet (b) stop if a part gets hot (c) dry your hands first (d) fly kites in open fields
9. 9.True or false: to touch a fallen wire is safe. (a) True (b) False
10. 10.🔋 How many 1.2 V cells must be joined in series to give 2.4 V?
11. 11.Which of these is safe? (a) build with an adult near (b) throw cells in a fire (c) climb an electric pole (d) fly a kite near wires
12. 12.🔁 Is the circuit closed or open if a cell is taken out? (a) closed (b) open
13. 13.⚡ What does a buzzer mainly change electricity into? (a) heat (b) movement (c) sound (d) light
14. 14.✏️ In a circuit diagram, which part is drawn as many long-short pairs? (a) battery (b) capacitor (c) bulb (d) motor
15. 15.🔦 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 ceramic cup. Does the bulb glow? (a) No (b) Yes
16. 16.🔋 Does a refrigerator give electricity or use electricity? (a) gives electricity (b) uses electricity
17. 17.🔘 When a switch is ON, the circuit is … (a) closed (b) broken (c) cut (d) open
18. 18.🔋 8 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)? =
19. 19.True or false: on a cell, “the shorter symbol line” means the − (negative) end. (a) True (b) False
20. 20.True or false: “used in house wiring” is true of a series circuit. (a) False (b) True
21. 21.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they explode (b) they get dimmer (c) they keep glowing (d) they all go out
22. 22.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) neither line (c) both lines (d) the longer line
23. 23.True or false: “a break stops every bulb” is true of a parallel circuit. (a) True (b) False
24. 24.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) True (b) False
25. 25.🔋 6 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
26. 26.Which of these is true of a series circuit? (a) many paths for current (b) a break stops every bulb (c) used in house wiring (d) one out, the rest glow
27. 27.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) a short circuit (b) an open circuit (c) a safe circuit (d) a parallel circuit
28. 28.True or false: to stay away from pylons is not safe. (a) False (b) True
29. 29.🔘 Two switches are in series. When does the bulb glow? (a) when both are ON (b) when both are OFF (c) when either is ON (d) never
30. 30.True or false: a mixer grinder mainly makes movement. (a) False (b) True
31. 31.🔌 Is a plastic straw a conductor or an insulator? (a) an insulator (b) a conductor
32. 32.🔋 Does a mobile phone give electricity or use electricity? (a) gives electricity (b) uses electricity
33. 33.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a steel coin across the gap. Does the bulb glow? (a) No (b) Yes
34. 34.True or false: a ceiling fan mainly makes movement. (a) True (b) False
35. 35.💡 A battery lights 3 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
36. 36.⚠️ Someone is getting a shock and is still touching a wire. What should you do? (a) wait and watch (b) pour water on them (c) pull them by the hand (d) shout for an adult
37. 37.💡 Why is house wiring done in parallel? (a) to save copper only (b) each gets full voltage (c) so all go off together (d) to make bulbs dim
38. 38.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) bulbs share the voltage (c) used in house wiring (d) a single current path
39. 39.🔋 What should you do with used-up cells? (a) throw them in a fire (b) cut them open (c) bury them in soil (d) give them for recycling
40. 40.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)

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