Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 635 · 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.🔌 Why are electric wires covered in plastic? (a) plastic makes current (b) to make them heavy (c) plastic is an insulator (d) plastic is a conductor
2. 2.🔋 Identical cells side by side (in parallel) give … (a) the same voltage (b) half the voltage (c) double the voltage (d) no voltage
3. 3.🔌 Is a copper wire a conductor or an insulator? (a) a conductor (b) an insulator
4. 4.🔦 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 rubber eraser. Does the bulb glow? (a) No (b) Yes
5. 5.Which of these mainly makes sound? (a) a traffic signal (b) a ceiling fan (c) a loudspeaker (d) a room heater
6. 6.🔌 Most metals are good … (a) conductors (b) magnets only (c) insulators (d) batteries
7. 7.Which of these means the circuit is closed? (a) all wires are joined (b) the bulb is unscrewed (c) a wire is cut (d) a wire has come loose
8. 8.Which drawing is the symbol for a capacitor? (a) a line lifted at a gap (b) a plain rectangle (c) one tall, one short bar (d) two equal parallel lines
9. 9.🔘 When a switch is ON, the circuit is … (a) cut (b) closed (c) open (d) broken
10. 10.True or false: one tall, one short bar is the symbol for a cell. (a) True (b) False
11. 11.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) True (b) False
12. 12.Which of these is true of a series circuit? (a) own switch for each bulb (b) one out, the rest glow (c) a single current path (d) each gets the full volts
13. 13.🔦 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
14. 14.True or false: to throw cells in a fire is safe. (a) False (b) True
15. 15.True or false: “one bulb out, all go out” is true of a series circuit. (a) True (b) False
16. 16.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) not joined (b) in parallel (c) in series (d) by Wi-Fi
17. 17.Which of these gives us electricity? (a) a wind turbine (b) a television (c) a water pump (d) a mobile phone
18. 18.🔘 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 OFF, B is ON and C is OFF. Does the bulb glow? (a) Yes (b) No
19. 19.True or false: a push button closes near a magnet. (a) False (b) True
20. 20.🔦 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 woollen thread. Does the bulb glow? (a) No (b) Yes
21. 21.True or false: to open a phone charger is safe. (a) True (b) False
22. 22.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is OFF and B is ON. Does the bulb glow? (a) No (b) Yes
23. 23.🔋 What should you do with used-up cells? (a) throw them in a fire (b) cut them open (c) give them for recycling (d) bury them in soil
24. 24.✏️ In a circuit diagram, which part is drawn as a small empty box? (a) battery (b) resistor (c) capacitor (d) wire
25. 25.🔋 How many volts does one ordinary torch cell give? (a) 15 V (b) 230 V (c) 1.5 V (d) 0.5 V
26. 26.True or false: if all wires are joined, the circuit is closed and current flows. (a) True (b) False
27. 27.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a fuse or MCB (b) a plug top (c) a bulb (d) a long wire
28. 28.💡 Why is house wiring done in parallel? (a) so all go off together (b) to save copper only (c) to make bulbs dim (d) each gets full voltage
29. 29.⚡ What does a traffic signal mainly change electricity into? (a) sound (b) heat (c) light (d) movement
30. 30.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is OFF, B is OFF, C is OFF and D is OFF. Does the bulb glow? (a) No (b) Yes
31. 31.✏️ In a circuit diagram, which part is drawn as many long-short pairs? (a) resistor (b) switch (c) battery (d) diode
32. 32.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) two (c) none (d) one
33. 33.What does a reed switch do? (a) works only while pressed (b) flips up or down (c) stays where you flip it (d) closes near a magnet
34. 34.True or false: “bulbs share the voltage” is true of a series circuit. (a) True (b) False
35. 35.True or false: two equal parallel lines is the symbol for an LED. (a) True (b) False
36. 36.Which of these means the circuit is open? (a) the switch is ON (b) the loop is complete (c) all wires are joined (d) a wire is cut
37. 37.🔘 Which kind of switch stays where you flip it? (a) a slide switch (b) a tilt switch (c) a toggle switch (d) a push button
38. 38.⚠️ Why must we never touch switches with wet hands? (a) water carries current (b) it is just untidy (c) it spoils the paint (d) water makes it cold
39. 39.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) sound energy (b) chemical energy (c) movement energy (d) light energy
40. 40.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) quick and clear for all (c) to hide the circuit (d) to make it colourful

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