Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 347 · 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: a small empty box is the symbol for a bulb. (a) True (b) False
2. 2.Which of these is not safe? (a) use small battery cells (b) take cells out after use (c) poke things in a socket (d) fly kites in open fields
3. 3.True or false: a cotton thread is a conductor. (a) True (b) False
4. 4.Which of these is safe? (a) touch a fallen wire (b) stay away from pylons (c) throw cells in a fire (d) touch a switch when wet
5. 5.🔋 Cells joined + to − in a row (series) give … (a) a smaller voltage (b) no voltage (c) a bigger voltage (d) the same voltage
6. 6.🔍 Which is the odd one out? (a) use a cable with cuts (b) use small battery cells (c) poke things in a socket (d) touch a fallen wire
7. 7.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they keep glowing (c) they all go out (d) they explode
8. 8.💡 3 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. Does bulb 2 glow? (a) Yes (b) No
9. 9.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) open (b) closed
10. 10.🔋 3 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)? =
11. 11.Which of these mainly gives out light? (a) a buzzer (b) an exhaust fan (c) a rice cooker (d) a torch
12. 12.⚡ What does a street light mainly change electricity into? (a) heat (b) sound (c) light (d) movement
13. 13.🔍 Which is the odd one out? (a) an iron nail (b) a cotton thread (c) aluminium foil (d) a steel spoon
14. 14.⚠️ Is it safe to open a phone charger? (a) safe (b) not safe
15. 15.💡 A battery lights 2 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
16. 16.💡 4 identical bulbs are in parallel and each one takes 0.2 A. What total current (in amperes) comes from the battery? =
17. 17.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) True (b) False
18. 18.Which of these is a conductor? (a) a woollen thread (b) aluminium foil (c) a dry cork (d) a plastic straw
19. 19.Which of these is a conductor? (a) a graphite rod (b) a rubber band (c) a dry cork (d) a ceramic cup
20. 20.True or false: a street light mainly gives out light. (a) False (b) True
21. 21.True or false: if a wire has come loose, the circuit is open and no current flows. (a) True (b) False
22. 22.Which of these mainly gives out light? (a) an electric iron (b) a school bell (c) a traffic signal (d) a buzzer
23. 23.✏️ In a cell symbol, which line is the + terminal? (a) neither line (b) both lines (c) the longer line (d) the shorter line
24. 24.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) series (b) parallel
25. 25.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
26. 26.Which of these is safe? (a) climb an electric pole (b) touch a switch when wet (c) use small battery cells (d) use a cable with cuts
27. 27.⚠️ Is it safe to touch a fallen wire? (a) safe (b) not safe
28. 28.⚡ What does a loudspeaker mainly change electricity into? (a) movement (b) heat (c) sound (d) light
29. 29.🔍 Which is the odd one out? (a) a water heater (b) an electric kettle (c) a ceiling fan (d) a room heater
30. 30.Which of these is an insulator? (a) a brass key (b) a rubber band (c) an iron nail (d) a metal paper clip
31. 31.✏️ In a circuit diagram, which part is drawn as a line lifted at a gap? (a) switch (b) battery (c) diode (d) bulb
32. 32.Which of these mainly gives out heat? (a) a toaster (b) a doorbell (c) a loudspeaker (d) a buzzer
33. 33.True or false: a tube light mainly gives out heat. (a) True (b) False
34. 34.Which of these is safe? (a) touch a fallen wire (b) fly a kite near wires (c) stop if a part gets hot (d) use a cable with cuts
35. 35.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 2 of the switches are OFF and the rest are ON. How many bulbs glow?
36. 36.True or false: a brass key is a conductor. (a) False (b) True
37. 37.True or false: if the switch is OFF, the circuit is closed and current flows. (a) True (b) False
38. 38.🔋 A 9 V battery and one 1.5 V cell are joined in series, all facing the same way. What is the total voltage (in volts)? =
39. 39.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a copper wire across the gap. Does the bulb glow? (a) No (b) Yes
40. 40.True or false: a steel spoon is an insulator. (a) True (b) False

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