Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 842 · 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.⚡ What does a loudspeaker mainly change electricity into? (a) movement (b) sound (c) heat (d) light
2. 2.True or false: on a cell, “usually the black wire” means the − (negative) end. (a) False (b) True
3. 3.⚡ What does a rice cooker mainly change electricity into? (a) light (b) sound (c) heat (d) movement
4. 4.💡 A battery lights 5 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
5. 5.🔦 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 metal paper clip. Does the bulb glow? (a) No (b) Yes
6. 6.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) it does not matter (b) only one (c) none (d) both of them
7. 7.✏️ In a cell symbol, which line is the + terminal? (a) neither line (b) both lines (c) the longer line (d) the shorter line
8. 8.🔍 Which is the odd one out? (a) a street light (b) a traffic signal (c) a night lamp (d) a toaster
9. 9.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) an open circuit (b) a short circuit (c) a parallel circuit (d) a safe circuit
10. 10.⚡ What does a traffic signal mainly change electricity into? (a) sound (b) heat (c) movement (d) light
11. 11.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
12. 12.Which of these means the circuit is closed? (a) the switch is OFF (b) the bulb is unscrewed (c) a wire is cut (d) the switch is ON
13. 13.💡 Why is house wiring done in parallel? (a) to save copper only (b) to make bulbs dim (c) each gets full voltage (d) so all go off together
14. 14.🔘 Which kind of switch flips up or down? (a) a push button (b) a tilt switch (c) a slide switch (d) a toggle switch
15. 15.🔘 Which kind of switch closes near a magnet? (a) a toggle switch (b) a push button (c) a reed switch (d) a tilt switch
16. 16.True or false: a woollen thread is an insulator. (a) False (b) True
17. 17.True or false: “used in house wiring” is true of a parallel circuit. (a) False (b) True
18. 18.Which of these is a conductor? (a) a ceramic cup (b) a plastic ruler (c) a rubber eraser (d) a brass key
19. 19.True or false: if a cell is taken out, the circuit is closed and current flows. (a) False (b) True
20. 20.💡 3 identical bulbs are joined in parallel across a 3 V battery (ideal wires). How many volts does each bulb get? =
21. 21.Which of these is an insulator? (a) a brass key (b) a metal paper clip (c) a steel coin (d) a wooden stick
22. 22.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a metal paper clip. Does the bulb glow? (a) Yes (b) No
23. 23.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
24. 24.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) a single current path (c) one bulb out, all go out (d) used in house wiring
25. 25.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
26. 26.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) bulb (b) junction (c) diode (d) capacitor
27. 27.What does a toggle switch do? (a) stays where you flip it (b) works only while pressed (c) springs back when let go (d) closes when tipped over
28. 28.⚠️ Is it safe to use mains for a project? (a) not safe (b) safe
29. 29.True or false: “many paths for current” is true of a series circuit. (a) False (b) True
30. 30.Which of these is not safe? (a) poke things in a socket (b) fly kites in open fields (c) build with an adult near (d) take cells out after use
31. 31.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) battery (b) capacitor (c) motor (d) switch
32. 32.⚠️ Is it safe to use a cable with cuts? (a) not safe (b) safe
33. 33.🔘 Which kind of switch springs back when let go? (a) a reed switch (b) a push button (c) a tilt switch (d) a slide switch
34. 34.💡 3 identical bulbs are in parallel and each bulb has its own switch on its path. 1 of the switches is OFF and the rest are ON. How many bulbs glow?
35. 35.Which of these mainly gives out heat? (a) a tube light (b) a table fan (c) an electric drill (d) a toaster
36. 36.🔦 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
37. 37.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the switch (b) the filament (c) the glass (d) the base
38. 38.🔗 Series or parallel circuit: “many paths for current”? (a) parallel (b) series
39. 39.True or false: to keep drinks far away is safe. (a) False (b) True
40. 40.⚠️ Someone is getting a shock and is still touching a wire. What should you do? (a) shout for an adult (b) wait and watch (c) pull them by the hand (d) pour water on them

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