Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 882 · 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.True or false: triangle, bar and arrows is the symbol for a battery. (a) False (b) True
2. 2.💡 5 identical bulbs are joined in series with a 20 V battery (ideal wires). How many volts does each bulb get? =
3. 3.🔌 Is aluminium foil a conductor or an insulator? (a) a conductor (b) an insulator
4. 4.🔍 Which is the odd one out? (a) a wooden stick (b) a graphite rod (c) a copper wire (d) a metal paper clip
5. 5.True or false: “used in house wiring” is true of a parallel circuit. (a) False (b) True
6. 6.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
7. 7.🔗 Series or parallel circuit: “a break stops every bulb”? (a) parallel (b) series
8. 8.🔌 Why are electric wires covered in plastic? (a) plastic is a conductor (b) to make them heavy (c) plastic is an insulator (d) plastic makes current
9. 9.What does a push button do? (a) works only while pressed (b) stays where you flip it (c) flips up or down (d) closes when tipped over
10. 10.🔌 Is a brass key a conductor or an insulator? (a) a conductor (b) an insulator
11. 11.⚠️ Which power source should children use for electronics projects? (a) a wall socket (b) a small battery pack (c) an inverter socket (d) a mains extension board
12. 12.True or false: to stay away from pylons is safe. (a) True (b) False
13. 13.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
14. 14.🔦 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) No (b) Yes
15. 15.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) to hide the circuit (c) to make it colourful (d) quick and clear for all
16. 16.💡 5 identical bulbs are in parallel and each one takes 0.5 A. What total current (in amperes) comes from the battery? =
17. 17.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
18. 18.Which of these means the circuit is closed? (a) all wires are joined (b) the bulb is unscrewed (c) a wire has come loose (d) the switch is OFF
19. 19.What does a slide switch do? (a) closes near a magnet (b) flips up or down (c) slides side to side (d) closes when tipped over
20. 20.True or false: “a break stops every bulb” is true of a series circuit. (a) False (b) True
21. 21.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) sound energy (b) light energy (c) movement energy (d) chemical energy
22. 22.Which of these is safe? (a) climb an electric pole (b) open a phone charger (c) throw cells in a fire (d) use small battery cells
23. 23.⚡ A cell changes stored chemical energy into which kind of energy? (a) sound energy (b) wind energy (c) electrical energy (d) nuclear energy
24. 24.🔍 Which is the odd one out? (a) a siren (b) a buzzer (c) a school bell (d) a tube light
25. 25.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a bulb (b) a long wire (c) a fuse or MCB (d) a plug top
26. 26.🔍 Which is the odd one out? (a) a rubber eraser (b) a dry cork (c) a steel spoon (d) a paper strip
27. 27.Which of these means the circuit is open? (a) all wires are joined (b) the loop is complete (c) the switch is ON (d) the switch is OFF
28. 28.✏️ In a circuit diagram, which part is drawn as a long and a short line? (a) switch (b) diode (c) cell (d) LED
29. 29.⚡ What does an electric toy car mainly change electricity into? (a) sound (b) light (c) heat (d) movement
30. 30.🔘 A bulb and a cell are joined through 4 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
31. 31.True or false: to stay away from pylons is not safe. (a) True (b) False
32. 32.True or false: a circle with a cross is the symbol for a diode. (a) True (b) False
33. 33.True or false: a school bell mainly makes sound. (a) False (b) True
34. 34.✏️ In a circuit diagram, which part is drawn as a small empty box? (a) resistor (b) LED (c) junction (d) capacitor
35. 35.True or false: “one out, the rest glow” is true of a parallel circuit. (a) True (b) False
36. 36.True or false: a metal paper clip is a conductor. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) touch a switch when wet (b) stay away from pylons (c) stop if a part gets hot (d) use small battery cells
38. 38.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 4 is taken out of its holder. Does bulb 1 glow? (a) Yes (b) No
39. 39.💡 A battery lights 2 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
40. 40.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)

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