Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 735 · 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.True or false: on a cell, “the flat end” means the − (negative) end. (a) False (b) True
2. 2.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) resistor (b) battery (c) diode (d) junction
3. 3.💡 3 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulbs 1 and 3 are taken out of their holders. How many bulbs glow?
4. 4.True or false: a mixer grinder mainly makes movement. (a) True (b) False
5. 5.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) never (b) only when both are OFF (c) only when both are ON (d) when either is ON
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.🔌 Is a graphite rod a conductor or an insulator? (a) a conductor (b) an insulator
8. 8.True or false: to fly a kite near wires is safe. (a) False (b) True
9. 9.🔌 Why are electric wires covered in plastic? (a) to make them heavy (b) plastic is a conductor (c) plastic makes current (d) plastic is an insulator
10. 10.True or false: to stay away from pylons is safe. (a) False (b) True
11. 11.⚡ What does a siren mainly change electricity into? (a) sound (b) movement (c) heat (d) light
12. 12.🔋 How many volts does one ordinary torch cell give? (a) 0.5 V (b) 230 V (c) 15 V (d) 1.5 V
13. 13.True or false: on a cell, “usually the black wire” means the + (positive) end. (a) False (b) True
14. 14.Which of these uses electricity? (a) a generator (b) a power station (c) a mobile phone (d) a cell
15. 15.💡 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?
16. 16.⚡ A fan changes electrical energy mainly into which kind of energy? (a) movement energy (b) chemical energy (c) light energy (d) sound energy
17. 17.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
18. 18.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
19. 19.💡 In a series circuit, how many paths does the current have? (a) two (b) none (c) one for each bulb (d) one
20. 20.💡 A battery lights 5 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
21. 21.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) brighter (b) dimmer (c) the same
22. 22.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a safety pin across the gap. Does the bulb glow? (a) Yes (b) No
23. 23.💡 4 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. How many bulbs glow?
24. 24.🔘 When a switch is ON, the circuit is … (a) broken (b) open (c) closed (d) cut
25. 25.Which of these is true of a series circuit? (a) own switch for each bulb (b) many paths for current (c) each gets the full volts (d) bulbs share the voltage
26. 26.🔦 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
27. 27.💡 Why is house wiring done in parallel? (a) to make bulbs dim (b) each gets full voltage (c) to save copper only (d) so all go off together
28. 28.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a rubber eraser across the gap. Does the bulb glow? (a) No (b) Yes
29. 29.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by a brass key. Does the bulb glow? (a) No (b) Yes
30. 30.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in series (b) in parallel (c) not joined (d) by Wi-Fi
31. 31.True or false: a circle with M inside is the symbol for a battery. (a) True (b) False
32. 32.What does a reed switch do? (a) springs back when let go (b) closes near a magnet (c) flips up or down (d) slides side to side
33. 33.🔘 A bulb and a cell are joined through 5 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
34. 34.What does a toggle switch do? (a) flips up or down (b) springs back when let go (c) works only while pressed (d) closes near a magnet
35. 35.Which of these is safe? (a) poke things in a socket (b) climb an electric pole (c) fly a kite near wires (d) stop if a part gets hot
36. 36.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) a cell is taken out (c) the switch is ON (d) a wire is cut
37. 37.True or false: a toggle switch closes when tipped over. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) a rubber eraser (b) a plastic straw (c) a graphite rod (d) a dry cork
39. 39.🔘 Which kind of switch works only while pressed? (a) a slide switch (b) a push button (c) a reed switch (d) a tilt switch
40. 40.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No

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