Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 43 · 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) build with an adult near (b) dry your hands first (c) fly a kite near wires (d) fly kites in open fields
2. 2.⚠️ Is it safe to open a phone charger? (a) safe (b) not safe
3. 3.True or false: “many paths for current” is true of a parallel circuit. (a) False (b) True
4. 4.True or false: “own switch for each bulb” is true of a series circuit. (a) True (b) False
5. 5.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 3 is taken out of its holder. How many bulbs glow?
6. 6.💡 3 identical bulbs are in parallel and each one takes 1 A. What total current (in amperes) comes from the battery? =
7. 7.🔦 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 woollen thread. Does the bulb glow? (a) No (b) Yes
8. 8.🔋 Does a solar panel give electricity or use electricity? (a) gives electricity (b) uses electricity
9. 9.🔋 How many volts does one ordinary torch cell give? (a) 15 V (b) 0.5 V (c) 1.5 V (d) 230 V
10. 10.🔋 8 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)? =
11. 11.💡 5 identical bulbs are in parallel and each bulb has its own switch on its path. 4 of the switches are OFF and the rest are ON. How many bulbs glow?
12. 12.True or false: “a break stops every bulb” is true of a parallel circuit. (a) True (b) False
13. 13.True or false: a tilt switch flips up or down. (a) True (b) False
14. 14.💡 Why is house wiring done in parallel? (a) each gets full voltage (b) so all go off together (c) to make bulbs dim (d) to save copper only
15. 15.True or false: a slide switch closes when tipped over. (a) False (b) True
16. 16.🔦 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
17. 17.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they explode (b) they all go out (c) they keep glowing (d) they get dimmer
18. 18.✏️ In a circuit diagram, which part is drawn as triangle against a bar? (a) voltmeter (b) diode (c) wire (d) junction
19. 19.🔌 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
20. 20.💡 3 identical bulbs are joined in series with a 9 V battery (ideal wires). How many volts does each bulb get? =
21. 21.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
22. 22.🔘 Which kind of switch closes when tipped over? (a) a reed switch (b) a slide switch (c) a toggle switch (d) a tilt switch
23. 23.True or false: if the switch is OFF, the circuit is closed and current flows. (a) True (b) False
24. 24.Which drawing is the symbol for a voltmeter? (a) a small empty box (b) a circle with V inside (c) one tall, one short bar (d) a circle with A inside
25. 25.💡 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?
26. 26.Which of these gives us electricity? (a) an air conditioner (b) a refrigerator (c) a generator (d) a washing machine
27. 27.⚡ A fan changes electrical energy mainly into which kind of energy? (a) movement energy (b) sound energy (c) chemical energy (d) light energy
28. 28.🔍 Which is the odd one out? (a) a rubber band (b) a steel spoon (c) aluminium foil (d) an iron nail
29. 29.🔋 2 identical 2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
30. 30.🔋 How many 1.5 V cells must be joined in series to give 6 V?
31. 31.True or false: a push button flips up or down. (a) False (b) True
32. 32.True or false: “used in house wiring” is true of a parallel circuit. (a) False (b) True
33. 33.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) light energy (b) sound energy (c) movement energy (d) chemical energy
34. 34.⚡ A solar panel changes which kind of energy into electricity? (a) wind energy (b) chemical energy (c) sound energy (d) light energy
35. 35.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) both of them (b) none (c) it does not matter (d) only one
36. 36.💡 5 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?
37. 37.🔍 Which is the odd one out? (a) dry your hands first (b) stop if a part gets hot (c) fly kites in open fields (d) throw cells in a fire
38. 38.True or false: to poke things in a socket is not safe. (a) True (b) False
39. 39.💡 2 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 2 is taken out of its holder. Does bulb 1 glow? (a) Yes (b) No
40. 40.⚠️ Is it safe to stay away from pylons? (a) not safe (b) safe

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