Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 793 · 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 switch is ON, the circuit is open and no current flows. (a) True (b) False
2. 2.⚠️ Why must we never touch switches with wet hands? (a) water carries current (b) it is just untidy (c) water makes it cold (d) it spoils the paint
3. 3.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a steel spoon. Does the bulb glow? (a) Yes (b) No
4. 4.🔌 Why are electric wires covered in plastic? (a) to make them heavy (b) plastic is a conductor (c) plastic makes current (d) plastic is an insulator
5. 5.⚡ What does an exhaust fan mainly change electricity into? (a) movement (b) sound (c) heat (d) light
6. 6.🔘 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 ON and C is ON. Does the bulb glow? (a) Yes (b) No
7. 7.Which of these means the circuit is open? (a) the loop is complete (b) all wires are joined (c) the bulb is unscrewed (d) the switch is ON
8. 8.True or false: to keep drinks far away is not safe. (a) False (b) True
9. 9.True or false: if the loop is complete, the circuit is open and no current flows. (a) True (b) False
10. 10.🔋 Cells joined + to − in a row (series) give … (a) a smaller voltage (b) a bigger voltage (c) no voltage (d) the same voltage
11. 11.Which of these is not safe? (a) fly a kite near wires (b) stop if a part gets hot (c) stay away from pylons (d) keep drinks far away
12. 12.🔘 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) No (b) Yes
13. 13.🔋 What is a battery? (a) one single wire (b) a switch with a lid (c) a kind of bulb (d) two or more cells joined
14. 14.Which of these is true of a series circuit? (a) bulbs share the voltage (b) used in house wiring (c) each gets the full volts (d) one out, the rest glow
15. 15.⚠️ Who should be with you when you build a circuit? (a) nobody (b) a younger child (c) a trusted adult (d) a stranger online
16. 16.True or false: triangle, bar and arrows is the symbol for an LED. (a) False (b) True
17. 17.True or false: on a cell, “usually the black wire” means the + (positive) end. (a) True (b) False
18. 18.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) True (b) False
19. 19.🔌 Is a rubber band a conductor or an insulator? (a) an insulator (b) a conductor
20. 20.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a cotton thread across the gap. Does the bulb glow? (a) Yes (b) No
21. 21.Which of these mainly makes movement? (a) an electric kettle (b) an electric iron (c) a table fan (d) a tube light
22. 22.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a plastic ruler. Does the bulb glow? (a) Yes (b) No
23. 23.💡 2 identical bulbs are joined in parallel across a 1.5 V battery (ideal wires). How many volts does each bulb get? =
24. 24.Which of these gives us electricity? (a) a cell (b) a computer (c) a refrigerator (d) a washing machine
25. 25.Which of these means the circuit is closed? (a) a cell is taken out (b) the bulb is unscrewed (c) a wire has come loose (d) all wires are joined
26. 26.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) motor (b) capacitor (c) diode (d) junction
27. 27.💡 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
28. 28.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) closed (b) open
29. 29.Which of these mainly makes movement? (a) a water heater (b) a toaster (c) a mixer grinder (d) a doorbell
30. 30.🔘 Which kind of switch flips up or down? (a) a tilt switch (b) a toggle switch (c) a reed switch (d) a slide switch
31. 31.🔍 Which is the odd one out? (a) throw cells in a fire (b) use small battery cells (c) use mains for a project (d) climb an electric pole
32. 32.🔦 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) Yes (b) No
33. 33.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 5 of the switches are OFF and the rest are ON. How many bulbs glow?
34. 34.🔍 Which is the odd one out? (a) a copper wire (b) a steel spoon (c) a woollen thread (d) a steel coin
35. 35.Which drawing is the symbol for a motor? (a) a long and a short line (b) a circle with V inside (c) a small empty box (d) a circle with M inside
36. 36.🔦 A circuit has a used-up (dead) 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 ruler. Does the bulb glow? (a) Yes (b) No
37. 37.🔌 A gap of dry air between two wires acts as … (a) a switch that is ON (b) a conductor (c) an insulator (d) a cell
38. 38.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the filament (b) the switch (c) the glass (d) the base
39. 39.Which of these is safe? (a) throw cells in a fire (b) open a phone charger (c) climb an electric pole (d) use small battery cells
40. 40.🔋 4 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)? =

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