Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 558 · 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.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. How many bulbs glow?
2. 2.Which of these is not safe? (a) build with an adult near (b) touch a fallen wire (c) fly kites in open fields (d) stay away from pylons
3. 3.Which of these is not safe? (a) open a phone charger (b) dry your hands first (c) fly kites in open fields (d) stay away from pylons
4. 4.True or false: a tube light mainly makes movement. (a) True (b) False
5. 5.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in parallel (b) in series (c) not joined (d) by Wi-Fi
6. 6.Which of these mainly gives out light? (a) a torch (b) an electric drill (c) an electric toy car (d) a buzzer
7. 7.🔌 Is a steel coin a conductor or an insulator? (a) a conductor (b) an insulator
8. 8.True or false: to touch a switch when wet is safe. (a) False (b) True
9. 9.What does a reed switch do? (a) springs back when let go (b) slides side to side (c) closes near a magnet (d) flips up or down
10. 10.🔍 Which is the odd one out? (a) fly a kite near wires (b) touch a switch when wet (c) throw cells in a fire (d) build with an adult near
11. 11.💡 2 identical bulbs are joined in parallel across a 4.5 V battery (ideal wires). How many volts does each bulb get? =
12. 12.🔘 When a switch is ON, the circuit is … (a) broken (b) open (c) cut (d) closed
13. 13.⚡ What does a rice cooker mainly change electricity into? (a) heat (b) sound (c) light (d) movement
14. 14.🔋 How many 1.2 V cells must be joined in series to give 8.4 V?
15. 15.🔋 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)? =
16. 16.🔘 Which kind of switch closes near a magnet? (a) a push button (b) a slide switch (c) a toggle switch (d) a reed switch
17. 17.⚠️ Why must we never touch switches with wet hands? (a) it spoils the paint (b) water carries current (c) it is just untidy (d) water makes it cold
18. 18.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) neither line (c) the longer line (d) both lines
19. 19.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
20. 20.✏️ In a circuit diagram, which part is drawn as a long and a short line? (a) battery (b) cell (c) LED (d) resistor
21. 21.🔘 A cell, a bulb and switches A, B and C are joined one after another in a single loop (series). A is ON, B is ON and C is ON. Does the bulb glow? (a) No (b) Yes
22. 22.True or false: “own switch for each bulb” is true of a series circuit. (a) False (b) True
23. 23.🔋 5 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)? =
24. 24.🔗 Series or parallel circuit: “one out, the rest glow”? (a) series (b) parallel
25. 25.True or false: a line lifted at a gap is the symbol for a switch. (a) True (b) False
26. 26.True or false: to fly kites in open fields is safe. (a) True (b) False
27. 27.True or false: to stop if a part gets hot is safe. (a) True (b) False
28. 28.⚡ What does a water heater mainly change electricity into? (a) light (b) heat (c) movement (d) sound
29. 29.💡 A battery lights 2 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
30. 30.🔘 What does a switch do in a circuit? (a) makes electricity (b) stores current (c) opens or closes the loop (d) changes the voltage
31. 31.🔁 Is the circuit closed or open if the loop is complete? (a) closed (b) open
32. 32.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) own switch for each bulb (c) a single current path (d) bulbs share the voltage
33. 33.🔋 What should you do with used-up cells? (a) give them for recycling (b) bury them in soil (c) throw them in a fire (d) cut them open
34. 34.⚡ What does an electric drill mainly change electricity into? (a) movement (b) light (c) sound (d) heat
35. 35.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
36. 36.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) False (b) True
37. 37.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. Does the bulb glow? (a) No (b) Yes
38. 38.⚠️ About how many volts do home sockets in India supply? (a) 12 V (b) 230 V (c) 9 V (d) 1.5 V
39. 39.🔋 A 6 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
40. 40.🔁 Is the circuit closed or open if a wire is cut? (a) open (b) closed

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