Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 827 · 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.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they explode (c) they keep glowing (d) they all go out
2. 2.Which drawing is the symbol for an LED? (a) triangle, bar and arrows (b) a circle with an X in it (c) two or more cell symbols (d) many long-short pairs
3. 3.🔋 Does a refrigerator give electricity or use electricity? (a) gives electricity (b) uses electricity
4. 4.🔦 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
5. 5.🔋 How many 3 V cells must be joined in series to give 9 V?
6. 6.✏️ In a cell symbol, which line is the + terminal? (a) both lines (b) the longer line (c) neither line (d) the shorter line
7. 7.Which of these means the circuit is open? (a) the bulb is unscrewed (b) the loop is complete (c) all wires are joined (d) the switch is ON
8. 8.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) False (b) True
9. 9.🔦 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
10. 10.💡 2 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. Does bulb 1 glow? (a) No (b) Yes
11. 11.🔋 5 identical 1.2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
12. 12.⚡ What does a ceiling fan mainly change electricity into? (a) heat (b) light (c) sound (d) movement
13. 13.💡 Why is house wiring done in parallel? (a) so all go off together (b) to save copper only (c) each gets full voltage (d) to make bulbs dim
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.💡 In a series circuit, how many paths does the current have? (a) none (b) one for each bulb (c) one (d) two
16. 16.🔍 Which is the odd one out? (a) a wooden stick (b) a copper wire (c) a plastic ruler (d) a ceramic cup
17. 17.🔍 Which is the odd one out? (a) a safety pin (b) a steel coin (c) a dry cork (d) a brass key
18. 18.⚠️ About how many volts do home sockets in India supply? (a) 230 V (b) 9 V (c) 1.5 V (d) 12 V
19. 19.🔍 Which is the odd one out? (a) stop if a part gets hot (b) touch a switch when wet (c) dry your hands first (d) build with an adult near
20. 20.⚡ A fan changes electrical energy mainly into which kind of energy? (a) movement energy (b) chemical energy (c) light energy (d) sound energy
21. 21.Which of these is safe? (a) touch a switch when wet (b) open a phone charger (c) touch a fallen wire (d) keep drinks far away
22. 22.🔋 Cells joined + to − in a row (series) give … (a) no voltage (b) a bigger voltage (c) a smaller voltage (d) the same voltage
23. 23.Which of these mainly gives out heat? (a) a tube light (b) an electric iron (c) a loudspeaker (d) an electric toy car
24. 24.True or false: a plastic straw is an insulator. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) a traffic signal (b) an LED lamp (c) a school bell (d) a torch
26. 26.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
27. 27.🔗 Series or parallel circuit: “each gets the full volts”? (a) series (b) parallel
28. 28.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
29. 29.🔍 Which is the odd one out? (a) a woollen thread (b) aluminium foil (c) a metal paper clip (d) a steel coin
30. 30.⚠️ Is it safe to poke things in a socket? (a) not safe (b) safe
31. 31.True or false: a plain rectangle is the symbol for a resistor. (a) False (b) True
32. 32.💡 3 identical bulbs are joined in series with a 7.5 V battery (ideal wires). How many volts does each bulb get? =
33. 33.🔋 What is a battery? (a) a switch with a lid (b) one single wire (c) two or more cells joined (d) a kind of bulb
34. 34.🔍 Which is the odd one out? (a) a wooden stick (b) a copper wire (c) a metal paper clip (d) an iron nail
35. 35.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
36. 36.💡 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
37. 37.💡 5 identical bulbs are joined in series with a 10 V battery (ideal wires). How many volts does each bulb get? =
38. 38.⚠️ Is it safe to build with an adult near? (a) not safe (b) safe
39. 39.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
40. 40.Which of these is safe? (a) fly a kite near wires (b) stay away from pylons (c) touch a switch when wet (d) touch a fallen wire

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