Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 53 · 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 not safe? (a) dry your hands first (b) poke things in a socket (c) take cells out after use (d) keep drinks far away
2. 2.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
3. 3.🔘 When a switch is ON, the circuit is … (a) open (b) cut (c) closed (d) broken
4. 4.⚡ A fan changes electrical energy mainly into which kind of energy? (a) light energy (b) sound energy (c) movement energy (d) chemical energy
5. 5.🔗 Series or parallel circuit: “one out, the rest glow”? (a) parallel (b) series
6. 6.Which of these gives us electricity? (a) a washing machine (b) a computer (c) a refrigerator (d) a solar panel
7. 7.Which of these is safe? (a) use mains for a project (b) fly kites in open fields (c) poke things in a socket (d) fly a kite near wires
8. 8.💡 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
9. 9.⚠️ Is it safe to fly a kite near wires? (a) safe (b) not safe
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. How many bulbs glow?
11. 11.Which of these mainly gives out light? (a) an electric toy car (b) an electric kettle (c) an LED lamp (d) a ceiling fan
12. 12.True or false: a paper strip is an insulator. (a) False (b) True
13. 13.True or false: “each gets the full volts” is true of a parallel circuit. (a) True (b) False
14. 14.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) it does not matter (b) both of them (c) none (d) only one
15. 15.⚡ What do we call a flow of electric charge through a wire? (a) friction (b) electric current (c) a magnet (d) sound
16. 16.💡 In a series circuit, how many paths does the current have? (a) two (b) one (c) one for each bulb (d) none
17. 17.True or false: “a single current path” is true of a series circuit. (a) True (b) False
18. 18.Which of these is safe? (a) use a cable with cuts (b) use mains for a project (c) use small battery cells (d) poke things in a socket
19. 19.🔦 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 wooden stick. Does the bulb glow? (a) Yes (b) No
20. 20.🔦 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 a plastic straw. Does the bulb glow? (a) No (b) Yes
21. 21.True or false: a plastic straw is a conductor. (a) True (b) False
22. 22.⚠️ Which power source should children use for electronics projects? (a) a small battery pack (b) a wall socket (c) an inverter socket (d) a mains extension board
23. 23.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
24. 24.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) False (b) True
25. 25.🔌 Is a graphite rod a conductor or an insulator? (a) an insulator (b) a conductor
26. 26.Which drawing is the symbol for a cell? (a) a circle with M inside (b) many long-short pairs (c) a long and a short line (d) a small empty box
27. 27.✏️ In a circuit diagram, which part is drawn as a dot where wires meet? (a) bulb (b) junction (c) voltmeter (d) battery
28. 28.🔘 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 OFF, B is ON and C is OFF. Does the bulb glow? (a) Yes (b) No
29. 29.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 1 of the switches is OFF and the rest are ON. How many bulbs glow?
30. 30.🔦 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
31. 31.True or false: a tilt switch works only while pressed. (a) True (b) False
32. 32.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
33. 33.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
34. 34.True or false: if a wire is cut, the circuit is open and no current flows. (a) True (b) False
35. 35.True or false: a reed switch springs back when let go. (a) True (b) False
36. 36.True or false: a reed switch stays where you flip it. (a) False (b) True
37. 37.Which drawing is the symbol for a motor? (a) two equal parallel lines (b) one tall, one short bar (c) a circle with M inside (d) a straight line
38. 38.💡 6 identical bulbs are in parallel and each one takes 0.25 A. What total current (in amperes) comes from the battery? =
39. 39.Which of these is an insulator? (a) a safety pin (b) a steel spoon (c) an iron nail (d) a plastic straw
40. 40.🔘 Which kind of switch closes near a magnet? (a) a slide switch (b) a reed switch (c) a tilt switch (d) a toggle switch

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