Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 922 · 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.🔌 Is a steel spoon a conductor or an insulator? (a) an insulator (b) a conductor
2. 2.🔋 A 3 V battery and one 1.5 V cell are joined in series, all facing the same way. What is the total voltage (in volts)? =
3. 3.🔘 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 OFF, B is ON and C is OFF. Does the bulb glow? (a) Yes (b) No
4. 4.⚠️ Someone is getting a shock and is still touching a wire. What should you do? (a) wait and watch (b) pull them by the hand (c) pour water on them (d) shout for an adult
5. 5.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) open (b) closed
6. 6.True or false: a mixer grinder mainly gives out heat. (a) False (b) True
7. 7.🔘 A bulb and a cell are joined through 4 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
8. 8.Which of these uses electricity? (a) a bicycle dynamo (b) a generator (c) a cell (d) a television
9. 9.⚡ Which tiny particles drift along a metal wire to carry the current? (a) dust particles (b) photons (c) electrons (d) water drops
10. 10.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
11. 11.Which of these is true of a series circuit? (a) own switch for each bulb (b) used in house wiring (c) one out, the rest glow (d) one bulb out, all go out
12. 12.💡 5 identical bulbs are joined in parallel across a 1.5 V battery (ideal wires). How many volts does each bulb get? =
13. 13.🔍 Which is the odd one out? (a) a doorbell (b) a room heater (c) a water heater (d) a rice cooker
14. 14.True or false: on a cell, “usually the black wire” means the + (positive) end. (a) True (b) False
15. 15.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) sound energy (b) movement energy (c) light energy (d) chemical energy
16. 16.🔍 Which is the odd one out? (a) poke things in a socket (b) use mains for a project (c) take cells out after use (d) climb an electric pole
17. 17.🔘 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 OFF, C is OFF and D is OFF. Does the bulb glow? (a) No (b) Yes
18. 18.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they all go out (b) they explode (c) they keep glowing (d) they get dimmer
19. 19.💡 Why is house wiring done in parallel? (a) so all go off together (b) each gets full voltage (c) to save copper only (d) to make bulbs dim
20. 20.Which of these means the circuit is open? (a) the loop is complete (b) the switch is ON (c) a wire is cut (d) all wires are joined
21. 21.🔍 Which is the odd one out? (a) take cells out after use (b) stay away from pylons (c) open a phone charger (d) fly kites in open fields
22. 22.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) in series (c) in parallel (d) not joined
23. 23.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) own switch for each bulb (c) bulbs share the voltage (d) one bulb out, all go out
24. 24.Which of these is an insulator? (a) aluminium foil (b) a safety pin (c) an iron nail (d) a plastic straw
25. 25.True or false: “used in house wiring” is true of a parallel circuit. (a) True (b) False
26. 26.True or false: if the switch is ON, the circuit is closed and current flows. (a) False (b) True
27. 27.🔦 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 wooden stick. Does the bulb glow? (a) No (b) Yes
28. 28.🔘 Which kind of switch works only while pressed? (a) a reed switch (b) a push button (c) a toggle switch (d) a tilt switch
29. 29.🔌 Is a cotton thread a conductor or an insulator? (a) a conductor (b) an insulator
30. 30.⚡ What does a street light mainly change electricity into? (a) heat (b) light (c) sound (d) movement
31. 31.True or false: a woollen thread is an insulator. (a) False (b) True
32. 32.Which of these is an insulator? (a) a graphite rod (b) a steel spoon (c) a ceramic cup (d) aluminium foil
33. 33.🔋 How many 2 V cells must be joined in series to give 8 V?
34. 34.🔋 Identical cells side by side (in parallel) give … (a) the same voltage (b) double the voltage (c) half the voltage (d) no voltage
35. 35.Which of these is an insulator? (a) a graphite rod (b) an iron nail (c) a dry cork (d) a brass key
36. 36.✏️ In a circuit diagram, wires are usually drawn as … (a) dotted circles (b) straight lines (c) little stars (d) wavy lines
37. 37.True or false: “each gets the full volts” is true of a parallel circuit. (a) True (b) False
38. 38.True or false: a safety pin is a conductor. (a) False (b) True
39. 39.Which drawing is the symbol for an ammeter? (a) a plain rectangle (b) many long-short pairs (c) two or more cell symbols (d) a circle with A inside
40. 40.True or false: a dry cork is an insulator. (a) True (b) False

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