Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 211 · 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.💡 Why is house wiring done in parallel? (a) to make bulbs dim (b) so all go off together (c) to save copper only (d) each gets full voltage
2. 2.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. How many bulbs glow?
3. 3.🔘 A bulb and a cell are joined through 6 switches on 6 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?
4. 4.True or false: “one out, the rest glow” is true of a series circuit. (a) False (b) True
5. 5.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) when either is ON (b) only when both are OFF (c) only when both are ON (d) never
6. 6.True or false: a toggle switch stays where you flip it. (a) False (b) True
7. 7.🔋 A 12 V battery and three 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
8. 8.🔋 4 identical 3 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
9. 9.True or false: “one out, the rest glow” is true of a parallel circuit. (a) True (b) False
10. 10.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
11. 11.Which of these gives us electricity? (a) a washing machine (b) a computer (c) a generator (d) a television
12. 12.Which of these is true of a series circuit? (a) many paths for current (b) one out, the rest glow (c) one bulb out, all go out (d) each gets the full volts
13. 13.✏️ In a circuit diagram, which part is drawn as a straight line? (a) wire (b) diode (c) capacitor (d) LED
14. 14.⚠️ Why must we never touch switches with wet hands? (a) water carries current (b) water makes it cold (c) it is just untidy (d) it spoils the paint
15. 15.🔍 Which is the odd one out? (a) a ceiling fan (b) a table fan (c) an electric kettle (d) an electric toy car
16. 16.🔌 Which metal is used for most electric wires at home? (a) glass (b) plastic (c) rubber (d) copper
17. 17.🔍 Which is the odd one out? (a) a school bell (b) an electric kettle (c) a toaster (d) a room heater
18. 18.🔋 Does a mobile phone give electricity or use electricity? (a) uses electricity (b) gives electricity
19. 19.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is ON, B is OFF, C is OFF and D is OFF. Does the bulb glow? (a) Yes (b) No
20. 20.⚠️ Is it safe to stop if a part gets hot? (a) not safe (b) safe
21. 21.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a cotton thread across the gap. Does the bulb glow? (a) Yes (b) No
22. 22.⚡ Which tiny particles drift along a metal wire to carry the current? (a) photons (b) dust particles (c) water drops (d) electrons
23. 23.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
24. 24.🔘 A bulb and a cell are joined through 3 switches on 3 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?
25. 25.💡 2 identical bulbs are joined in parallel across a 6 V battery (ideal wires). How many volts does each bulb get? =
26. 26.Which of these mainly makes sound? (a) a toaster (b) a tube light (c) a doorbell (d) an electric iron
27. 27.🔘 When a switch is ON, the circuit is … (a) open (b) cut (c) closed (d) broken
28. 28.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
29. 29.✏️ In a circuit diagram, wires are usually drawn as … (a) wavy lines (b) little stars (c) dotted circles (d) straight lines
30. 30.True or false: to fly a kite near wires is safe. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) stop if a part gets hot (b) use mains for a project (c) touch a fallen wire (d) use a cable with cuts
32. 32.🔍 Which is the odd one out? (a) use a cable with cuts (b) stay away from pylons (c) open a phone charger (d) throw cells in a fire
33. 33.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is ON, B is ON, C is ON and D is OFF. Does the bulb glow? (a) Yes (b) No
34. 34.🔦 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) No (b) Yes
35. 35.🔍 Which is the odd one out? (a) a traffic signal (b) an LED lamp (c) a table fan (d) a street light
36. 36.⚠️ Someone is getting a shock and is still touching a wire. What should you do? (a) pull them by the hand (b) wait and watch (c) pour water on them (d) shout for an adult
37. 37.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) a break stops every bulb (c) one out, the rest glow (d) bulbs share the voltage
38. 38.🔌 Is a copper wire a conductor or an insulator? (a) a conductor (b) an insulator
39. 39.✏️ Why do engineers draw circuits with symbols? (a) to make it colourful (b) symbols are heavier (c) quick and clear for all (d) to hide the circuit
40. 40.True or false: “a single current path” is true of a series circuit. (a) False (b) True

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