Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 86 · 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.💡 A battery lights 5 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
2. 2.True or false: “used in house wiring” is true of a parallel circuit. (a) False (b) True
3. 3.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a bulb (b) a fuse or MCB (c) a plug top (d) a long wire
4. 4.💡 A battery lights 3 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
5. 5.⚠️ About how many volts do home sockets in India supply? (a) 9 V (b) 230 V (c) 1.5 V (d) 12 V
6. 6.Which of these is safe? (a) keep drinks far away (b) touch a fallen wire (c) touch a switch when wet (d) open a phone charger
7. 7.🔋 How many volts does one ordinary torch cell give? (a) 15 V (b) 1.5 V (c) 230 V (d) 0.5 V
8. 8.True or false: a tilt switch stays where you flip it. (a) True (b) False
9. 9.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they all go out (c) they explode (d) they keep glowing
10. 10.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
11. 11.⚠️ Is it safe to build with an adult near? (a) not safe (b) safe
12. 12.⚠️ Is it safe to throw cells in a fire? (a) safe (b) not safe
13. 13.🔋 How many 3 V cells must be joined in series to give 24 V?
14. 14.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
15. 15.True or false: to take cells out after use is safe. (a) False (b) True
16. 16.True or false: a tilt switch closes when tipped over. (a) False (b) True
17. 17.Which of these gives us electricity? (a) a computer (b) a refrigerator (c) a generator (d) a washing machine
18. 18.🔌 Is a steel spoon a conductor or an insulator? (a) an insulator (b) a conductor
19. 19.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) in series (c) not joined (d) in parallel
20. 20.🔋 A 12 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
21. 21.🔋 How many 1.5 V cells must be joined in series to give 7.5 V?
22. 22.Which of these mainly gives out light? (a) a room heater (b) a rice cooker (c) a table fan (d) a night lamp
23. 23.What does a reed switch do? (a) springs back when let go (b) stays where you flip it (c) closes near a magnet (d) works only while pressed
24. 24.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a dry cork across the gap. Does the bulb glow? (a) No (b) Yes
25. 25.🔍 Which is the odd one out? (a) a steel coin (b) a graphite rod (c) a brass key (d) a rubber eraser
26. 26.🔋 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)? =
27. 27.⚠️ Is it safe to use small battery cells? (a) safe (b) not safe
28. 28.🔍 Which is the odd one out? (a) a safety pin (b) a glass marble (c) a dry cork (d) a wooden stick
29. 29.True or false: “used in house wiring” is true of a series circuit. (a) False (b) True
30. 30.🔌 Is a plastic ruler a conductor or an insulator? (a) a conductor (b) an insulator
31. 31.✏️ In a circuit diagram, which part is drawn as a straight line? (a) voltmeter (b) wire (c) diode (d) switch
32. 32.✏️ In a circuit diagram, which part is drawn as a line lifted at a gap? (a) bulb (b) switch (c) diode (d) voltmeter
33. 33.True or false: a paper strip is an insulator. (a) False (b) True
34. 34.True or false: if a wire is cut, the circuit is open and no current flows. (a) True (b) False
35. 35.🔦 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) Yes (b) No
36. 36.🔌 Which metal is used for most electric wires at home? (a) plastic (b) copper (c) rubber (d) glass
37. 37.🔋 Identical cells side by side (in parallel) give … (a) double the voltage (b) half the voltage (c) the same voltage (d) no voltage
38. 38.⚠️ Which power source should children use for electronics projects? (a) a wall socket (b) a mains extension board (c) an inverter socket (d) a small battery pack
39. 39.🔌 A gap of dry air between two wires acts as … (a) a switch that is ON (b) a cell (c) a conductor (d) an insulator
40. 40.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) a cell is taken out (c) a wire is cut (d) all wires are joined

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