Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 168 · 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 4 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
2. 2.Which of these means the circuit is closed? (a) a wire has come loose (b) the switch is OFF (c) the loop is complete (d) a cell is taken out
3. 3.True or false: an exhaust fan mainly makes sound. (a) True (b) False
4. 4.⚠️ Is it safe to stay away from pylons? (a) not safe (b) safe
5. 5.What does a toggle switch do? (a) closes near a magnet (b) works only while pressed (c) flips up or down (d) springs back when let go
6. 6.⚡ Which tiny particles drift along a metal wire to carry the current? (a) electrons (b) water drops (c) dust particles (d) photons
7. 7.🔘 A cell and a bulb are joined to 3 side-by-side paths with one switch on each path — A, B and C (parallel). A is OFF, B is ON and C is ON. Does the bulb glow? (a) No (b) Yes
8. 8.✏️ Why do engineers draw circuits with symbols? (a) to make it colourful (b) symbols are heavier (c) to hide the circuit (d) quick and clear for all
9. 9.🔌 Is a ceramic cup a conductor or an insulator? (a) a conductor (b) an insulator
10. 10.✏️ In a circuit diagram, which part is drawn as a line lifted at a gap? (a) voltmeter (b) bulb (c) switch (d) motor
11. 11.💡 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. How many bulbs glow?
12. 12.True or false: to use mains for a project is safe. (a) False (b) True
13. 13.🔁 Is the circuit closed or open if a wire is cut? (a) closed (b) open
14. 14.🔦 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 dry cork. Does the bulb glow? (a) Yes (b) No
15. 15.Which of these mainly makes movement? (a) a table fan (b) an electric kettle (c) a loudspeaker (d) a buzzer
16. 16.✏️ In a circuit diagram, which part is drawn as a circle with V inside? (a) wire (b) voltmeter (c) capacitor (d) junction
17. 17.True or false: to throw cells in a fire is not safe. (a) False (b) True
18. 18.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the filament (b) the glass (c) the switch (d) the base
19. 19.Which of these is safe? (a) use mains for a project (b) stay away from pylons (c) poke things in a socket (d) open a phone charger
20. 20.What does a tilt switch do? (a) works only while pressed (b) springs back when let go (c) closes when tipped over (d) closes near a magnet
21. 21.Which of these mainly gives out heat? (a) a tube light (b) an LED lamp (c) a room heater (d) a siren
22. 22.🔍 Which is the odd one out? (a) a metal paper clip (b) a dry cork (c) a graphite rod (d) a brass key
23. 23.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 5 is taken out of its holder. Does bulb 1 glow? (a) No (b) Yes
24. 24.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
25. 25.True or false: on a cell, “usually the black wire” means the + (positive) end. (a) False (b) True
26. 26.What does a push button do? (a) closes near a magnet (b) springs back when let go (c) stays where you flip it (d) flips up or down
27. 27.True or false: a rubber band is a conductor. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) build with an adult near (b) fly kites in open fields (c) stay away from pylons (d) climb an electric pole
29. 29.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they all go out (b) they get dimmer (c) they explode (d) they keep glowing
30. 30.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) True (b) False
31. 31.True or false: “bulbs share the voltage” is true of a series circuit. (a) True (b) False
32. 32.🔦 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) No (b) Yes
33. 33.🔋 How many 1.5 V cells must be joined in series to give 3 V?
34. 34.⚠️ Which power source should children use for electronics projects? (a) a wall socket (b) a mains extension board (c) a small battery pack (d) an inverter socket
35. 35.True or false: to touch a switch when wet is not safe. (a) True (b) False
36. 36.🔘 Which kind of switch slides side to side? (a) a reed switch (b) a toggle switch (c) a slide switch (d) a tilt switch
37. 37.True or false: on a cell, “the shorter symbol line” means the + (positive) end. (a) True (b) False
38. 38.🔘 Which kind of switch closes near a magnet? (a) a toggle switch (b) a reed switch (c) a slide switch (d) a tilt switch
39. 39.True or false: if a wire is cut, the circuit is open and no current flows. (a) True (b) False
40. 40.🔘 A bulb and a cell are joined through 3 switches on 3 side-by-side paths, one switch on each path (parallel). What is the smallest number of switches that must be ON to light the bulb?

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