Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 173 · 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.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 3 is taken out of its holder. How many bulbs glow?
2. 2.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
3. 3.🔘 A cell and a bulb are joined to 4 side-by-side paths with one switch on each path — A, B, C and D (parallel). A is ON, B is ON, C is ON and D is OFF. Does the bulb glow? (a) No (b) Yes
4. 4.🔌 Is a safety pin a conductor or an insulator? (a) an insulator (b) a conductor
5. 5.🔁 Is the circuit closed or open if a wire has come loose? (a) closed (b) open
6. 6.🔌 Is a steel coin a conductor or an insulator? (a) a conductor (b) an insulator
7. 7.💡 3 identical bulbs are in parallel and each one takes 0.25 A. What total current (in amperes) comes from the battery? =
8. 8.Which of these is not safe? (a) fly kites in open fields (b) stay away from pylons (c) use small battery cells (d) touch a fallen wire
9. 9.✏️ In a circuit diagram, which part is drawn as triangle against a bar? (a) wire (b) voltmeter (c) junction (d) diode
10. 10.🔋 Does an air conditioner give electricity or use electricity? (a) uses electricity (b) gives electricity
11. 11.True or false: triangle, bar and arrows is the symbol for a diode. (a) False (b) True
12. 12.⚠️ Which power source should children use for electronics projects? (a) a small battery pack (b) a wall socket (c) a mains extension board (d) an inverter socket
13. 13.🔘 What does a switch do in a circuit? (a) changes the voltage (b) stores current (c) opens or closes the loop (d) makes electricity
14. 14.🔘 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?
15. 15.💡 A battery lights 3 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
16. 16.Which of these mainly gives out heat? (a) an LED lamp (b) a doorbell (c) a traffic signal (d) an electric iron
17. 17.⚡ What does a table fan mainly change electricity into? (a) heat (b) light (c) movement (d) sound
18. 18.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) both lines (c) neither line (d) the longer line
19. 19.True or false: “used in house wiring” is true of a series circuit. (a) True (b) False
20. 20.Which drawing is the symbol for a voltmeter? (a) a line lifted at a gap (b) one tall, one short bar (c) a circle with an X in it (d) a circle with V inside
21. 21.🔘 Switch A is on the main wire next to the cell and the bulb; then the wire splits into two side-by-side paths, one with switch B and one with switch C. A is ON, B is OFF and C is ON. Does the bulb glow? (a) No (b) Yes
22. 22.True or false: a reed switch closes near a magnet. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) an electric toy car (b) an LED lamp (c) a night lamp (d) a torch
24. 24.Which of these is a conductor? (a) aluminium foil (b) a paper strip (c) a woollen thread (d) a dry cork
25. 25.🔦 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 aluminium foil. Does the bulb glow? (a) No (b) Yes
26. 26.🔦 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) No (b) Yes
27. 27.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) open (b) closed
28. 28.True or false: if a cell is taken out, the circuit is open and no current flows. (a) True (b) False
29. 29.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) in parallel (c) not joined (d) in series
30. 30.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) battery (b) wire (c) ammeter (d) voltmeter
31. 31.True or false: a dry cork is a conductor. (a) False (b) True
32. 32.⚠️ Who should be with you when you build a circuit? (a) nobody (b) a trusted adult (c) a stranger online (d) a younger child
33. 33.🔋 What should you do with used-up cells? (a) throw them in a fire (b) give them for recycling (c) bury them in soil (d) cut them open
34. 34.💡 Why is house wiring done in parallel? (a) to make bulbs dim (b) to save copper only (c) each gets full voltage (d) so all go off together
35. 35.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are ON (b) when either is ON (c) only when both are OFF (d) never
36. 36.🔍 Which is the odd one out? (a) a steel spoon (b) a wooden stick (c) a glass marble (d) a cotton thread
37. 37.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) True (b) False
38. 38.True or false: a long and a short line is the symbol for a junction. (a) True (b) False
39. 39.Which of these means the circuit is open? (a) the loop is complete (b) a wire has come loose (c) the switch is ON (d) all wires are joined
40. 40.🔁 Is the circuit closed or open if the loop is complete? (a) closed (b) open

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