Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 13 · 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.Which of these is an insulator? (a) a woollen thread (b) an iron nail (c) a brass key (d) a metal paper clip
2. 2.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) False (b) True
3. 3.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) False (b) True
4. 4.💡 3 identical bulbs are joined in parallel across a 1.5 V battery (ideal wires). How many volts does each bulb get? =
5. 5.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
6. 6.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a brass key across the gap. Does the bulb glow? (a) Yes (b) No
7. 7.⚡ A solar panel changes which kind of energy into electricity? (a) wind energy (b) sound energy (c) chemical energy (d) light energy
8. 8.🔘 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 ON, B is OFF and C is OFF. Does the bulb glow? (a) Yes (b) No
9. 9.🔋 How many 1.2 V cells must be joined in series to give 3.6 V?
10. 10.✏️ Why do engineers draw circuits with symbols? (a) to hide the circuit (b) to make it colourful (c) quick and clear for all (d) symbols are heavier
11. 11.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
12. 12.🔘 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 OFF, B is OFF, C is ON and D is OFF. Does the bulb glow? (a) No (b) Yes
13. 13.⚡ What does an electric iron mainly change electricity into? (a) movement (b) heat (c) sound (d) light
14. 14.What does a reed switch do? (a) stays where you flip it (b) closes near a magnet (c) flips up or down (d) springs back when let go
15. 15.True or false: a long and a short line is the symbol for a bulb. (a) False (b) True
16. 16.🔌 Is a woollen thread a conductor or an insulator? (a) a conductor (b) an insulator
17. 17.⚠️ Is it safe to climb an electric pole? (a) not safe (b) safe
18. 18.💡 A battery lights 2 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
19. 19.🔁 Is the circuit closed or open if a wire has come loose? (a) open (b) closed
20. 20.🔌 Is an iron nail a conductor or an insulator? (a) a conductor (b) an insulator
21. 21.🔍 Which is the odd one out? (a) a ceramic cup (b) a plastic straw (c) an iron nail (d) a paper strip
22. 22.⚠️ Who should be with you when you build a circuit? (a) a trusted adult (b) nobody (c) a younger child (d) a stranger online
23. 23.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a wooden stick. Does the bulb glow? (a) Yes (b) No
24. 24.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) switch (b) wire (c) capacitor (d) resistor
25. 25.🔍 Which is the odd one out? (a) a paper strip (b) a glass marble (c) a steel coin (d) a wooden stick
26. 26.💡 Why is house wiring done in parallel? (a) each gets full voltage (b) to save copper only (c) so all go off together (d) to make bulbs dim
27. 27.🔋 Identical cells side by side (in parallel) give … (a) the same voltage (b) no voltage (c) half the voltage (d) double the voltage
28. 28.⚠️ Is it safe to throw cells in a fire? (a) not safe (b) safe
29. 29.🔋 How many volts does one ordinary torch cell give? (a) 15 V (b) 230 V (c) 1.5 V (d) 0.5 V
30. 30.True or false: a glass marble is an insulator. (a) True (b) False
31. 31.💡 4 identical bulbs are in parallel and each one takes 0.1 A. What total current (in amperes) comes from the battery? =
32. 32.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) one (c) none (d) two
33. 33.True or false: two equal parallel lines is the symbol for a resistor. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) a traffic signal (b) a toaster (c) a street light (d) a night lamp
35. 35.✏️ In a cell symbol, which line is the + terminal? (a) both lines (b) the shorter line (c) neither line (d) the longer line
36. 36.⚠️ Is it safe to use mains for a project? (a) safe (b) not safe
37. 37.True or false: a room heater mainly makes sound. (a) False (b) True
38. 38.True or false: a graphite rod is a conductor. (a) False (b) True
39. 39.🔋 What should you do with used-up cells? (a) bury them in soil (b) give them for recycling (c) throw them in a fire (d) cut them open
40. 40.💡 3 identical bulbs are joined in parallel across a 6 V battery (ideal wires). How many volts does each bulb get? =

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