Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 500 · 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: to touch a fallen wire is not safe. (a) True (b) False
2. 2.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 2 glow? (a) No (b) Yes
3. 3.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put an iron nail across the gap. Does the bulb glow? (a) No (b) Yes
4. 4.True or false: a night lamp mainly gives out light. (a) False (b) True
5. 5.🔋 How many volts does one ordinary torch cell give? (a) 15 V (b) 230 V (c) 1.5 V (d) 0.5 V
6. 6.⚠️ Is it safe to fly kites in open fields? (a) safe (b) not safe
7. 7.True or false: a table fan mainly gives out heat. (a) True (b) False
8. 8.True or false: a night lamp mainly gives out heat. (a) False (b) True
9. 9.🔘 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?
10. 10.True or false: an exhaust fan mainly makes sound. (a) True (b) False
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.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 4 is taken out of its holder. Does bulb 2 glow? (a) Yes (b) No
13. 13.True or false: a traffic signal mainly gives out heat. (a) False (b) True
14. 14.True or false: to use mains for a project is not safe. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) a steel coin (b) aluminium foil (c) a steel spoon (d) a woollen thread
16. 16.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) True (b) False
17. 17.🔁 What do we call a circuit with a break in it? (a) a closed circuit (b) an open circuit (c) a series circuit (d) a full circuit
18. 18.🔍 Which is the odd one out? (a) a mixer grinder (b) an electric toy car (c) an exhaust fan (d) a toaster
19. 19.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 5 is taken out of its holder. Does bulb 1 glow? (a) No (b) Yes
20. 20.True or false: on a cell, “the shorter symbol line” means the + (positive) end. (a) False (b) True
21. 21.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) − (negative) (b) + (positive)
22. 22.🔋 6 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
23. 23.✏️ Why do engineers draw circuits with symbols? (a) to make it colourful (b) symbols are heavier (c) to hide the circuit (d) quick and clear for all
24. 24.💡 3 identical bulbs are joined in parallel across a 6 V battery (ideal wires). How many volts does each bulb get? =
25. 25.True or false: a small empty box is the symbol for a wire. (a) True (b) False
26. 26.🔘 Which kind of switch stays where you flip it? (a) a tilt switch (b) a push button (c) a reed switch (d) a toggle switch
27. 27.Which of these mainly gives out heat? (a) a street light (b) a room heater (c) an exhaust fan (d) a table fan
28. 28.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) one out, the rest glow (c) bulbs share the voltage (d) a single current path
29. 29.💡 4 identical bulbs are in parallel and each one takes 1 A. What total current (in amperes) comes from the battery? =
30. 30.🔌 Is a graphite rod a conductor or an insulator? (a) a conductor (b) an insulator
31. 31.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they explode (b) they keep glowing (c) they all go out (d) they get dimmer
32. 32.Which of these gives us electricity? (a) a television (b) a mobile phone (c) a power station (d) a refrigerator
33. 33.💡 In a series circuit, how many paths does the current have? (a) one (b) one for each bulb (c) two (d) none
34. 34.💡 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) dimmer (c) the same
35. 35.💡 5 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 3 is taken out of its holder. How many bulbs glow?
36. 36.✏️ In a circuit diagram, which part is drawn as many long-short pairs? (a) switch (b) cell (c) voltmeter (d) battery
37. 37.True or false: a plastic straw is a conductor. (a) True (b) False
38. 38.Which of these is safe? (a) use small battery cells (b) use mains for a project (c) throw cells in a fire (d) poke things in a socket
39. 39.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
40. 40.True or false: a line lifted at a gap is the symbol for a switch. (a) False (b) True

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