Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 909 · 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: if the bulb is unscrewed, the circuit is closed and current flows. (a) False (b) True
2. 2.💡 4 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 4 glow? (a) Yes (b) No
3. 3.⚠️ Someone is getting a shock and is still touching a wire. What should you do? (a) pull them by the hand (b) pour water on them (c) wait and watch (d) shout for an adult
4. 4.True or false: on a cell, “usually the black wire” means the + (positive) end. (a) True (b) False
5. 5.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) + (positive) (b) − (negative)
6. 6.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is ON, B is ON, C is OFF and D is ON. Does the bulb glow? (a) No (b) Yes
7. 7.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) parallel (b) series
8. 8.🔋 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)? =
9. 9.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) True (b) False
10. 10.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
11. 11.💡 3 identical bulbs are joined in series with a 3 V battery (ideal wires). How many volts does each bulb get? =
12. 12.Which of these is not safe? (a) take cells out after use (b) keep drinks far away (c) stay away from pylons (d) use mains for a project
13. 13.🔁 What do we call a circuit with a break in it? (a) a full circuit (b) an open circuit (c) a closed circuit (d) a series circuit
14. 14.✏️ Why do engineers draw circuits with symbols? (a) to make it colourful (b) to hide the circuit (c) quick and clear for all (d) symbols are heavier
15. 15.True or false: a rubber eraser is a conductor. (a) True (b) False
16. 16.True or false: a brass key is a conductor. (a) False (b) True
17. 17.True or false: if a cell is taken out, the circuit is closed and current flows. (a) False (b) True
18. 18.🔌 Which metal is used for most electric wires at home? (a) glass (b) plastic (c) copper (d) rubber
19. 19.⚠️ Is it safe to dry your hands first? (a) not safe (b) safe
20. 20.True or false: to use small battery cells is not safe. (a) True (b) False
21. 21.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a metal paper clip across the gap. Does the bulb glow? (a) No (b) Yes
22. 22.💡 Why is house wiring done in parallel? (a) to save copper only (b) to make bulbs dim (c) each gets full voltage (d) so all go off together
23. 23.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) one bulb out, all go out (c) one out, the rest glow (d) a single current path
24. 24.🔌 Is a cotton thread a conductor or an insulator? (a) an insulator (b) a conductor
25. 25.⚠️ Is it safe to use mains for a project? (a) not safe (b) safe
26. 26.Which of these uses electricity? (a) a cell (b) a solar panel (c) a bicycle dynamo (d) a refrigerator
27. 27.🔌 Most metals are good … (a) batteries (b) magnets only (c) conductors (d) insulators
28. 28.True or false: one tall, one short bar is the symbol for a wire. (a) True (b) False
29. 29.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) the switch is OFF (c) the switch is ON (d) a cell is taken out
30. 30.Which of these gives us electricity? (a) a mobile phone (b) a computer (c) a television (d) a cell
31. 31.Which drawing is the symbol for a battery? (a) two equal parallel lines (b) a small empty box (c) a circle with V inside (d) two or more cell symbols
32. 32.🔍 Which is the odd one out? (a) a plastic straw (b) a cotton thread (c) a paper strip (d) a metal paper clip
33. 33.🔋 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)? =
34. 34.True or false: a tilt switch stays where you flip it. (a) True (b) False
35. 35.🔌 A gap of dry air between two wires acts as … (a) a conductor (b) an insulator (c) a cell (d) a switch that is ON
36. 36.True or false: a line lifted at a gap is the symbol for an LED. (a) True (b) False
37. 37.🔋 How many volts does one ordinary torch cell give? (a) 230 V (b) 1.5 V (c) 15 V (d) 0.5 V
38. 38.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is ON, B is OFF and C is OFF. Does the bulb glow? (a) No (b) Yes
39. 39.🔗 Series or parallel circuit: “a single current path”? (a) series (b) parallel
40. 40.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) own switch for each bulb (c) bulbs share the voltage (d) a single current path

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