Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 415 · 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.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the glass (b) the switch (c) the filament (d) the base
2. 2.💡 3 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. Bulbs 1 and 2 are taken out of their holders. How many bulbs glow?
3. 3.🔌 Why are electric wires covered in plastic? (a) to make them heavy (b) plastic is an insulator (c) plastic is a conductor (d) plastic makes current
4. 4.What does a tilt switch do? (a) closes near a magnet (b) works only while pressed (c) closes when tipped over (d) slides side to side
5. 5.True or false: if the bulb is unscrewed, the circuit is open and no current flows. (a) True (b) False
6. 6.Which of these is safe? (a) touch a switch when wet (b) climb an electric pole (c) stop if a part gets hot (d) touch a fallen wire
7. 7.🔘 Which kind of switch closes when tipped over? (a) a slide switch (b) a toggle switch (c) a push button (d) a tilt switch
8. 8.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by a steel spoon. Does the bulb glow? (a) Yes (b) No
9. 9.⚡ A solar panel changes which kind of energy into electricity? (a) chemical energy (b) sound energy (c) wind energy (d) light energy
10. 10.✏️ In a circuit diagram, wires are usually drawn as … (a) dotted circles (b) straight lines (c) wavy lines (d) little stars
11. 11.🔍 Which is the odd one out? (a) a plastic ruler (b) aluminium foil (c) a dry cork (d) a rubber band
12. 12.Which of these is safe? (a) climb an electric pole (b) touch a switch when wet (c) take cells out after use (d) use mains for a project
13. 13.⚠️ Is it safe to dry your hands first? (a) not safe (b) safe
14. 14.⚡ What does a mixer grinder mainly change electricity into? (a) sound (b) light (c) movement (d) heat
15. 15.Which of these uses electricity? (a) a wind turbine (b) a power station (c) a battery (d) an air conditioner
16. 16.True or false: on a cell, “usually the black wire” means the + (positive) end. (a) True (b) False
17. 17.Which of these is not safe? (a) take cells out after use (b) build with an adult near (c) stop if a part gets hot (d) poke things in a socket
18. 18.True or false: “one out, the rest glow” is true of a series circuit. (a) False (b) True
19. 19.✏️ In a circuit diagram, which part is drawn as triangle against a bar? (a) battery (b) LED (c) ammeter (d) diode
20. 20.Which drawing is the symbol for a motor? (a) a small empty box (b) a circle with M inside (c) two equal parallel lines (d) a circle with a cross
21. 21.🔍 Which is the odd one out? (a) an electric drill (b) a mixer grinder (c) a ceiling fan (d) a water heater
22. 22.Which of these is not safe? (a) stop if a part gets hot (b) keep drinks far away (c) stay away from pylons (d) fly a kite near wires
23. 23.🔗 Series or parallel circuit: “used in house wiring”? (a) parallel (b) series
24. 24.💡 3 identical bulbs are joined in series with a 4.5 V battery (ideal wires). How many volts does each bulb get? =
25. 25.🔌 A gap of dry air between two wires acts as … (a) an insulator (b) a cell (c) a conductor (d) a switch that is ON
26. 26.True or false: a straight line is the symbol for a switch. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) a brass key (b) a steel coin (c) a steel spoon (d) a paper strip
28. 28.⚡ A cell changes stored chemical energy into which kind of energy? (a) wind energy (b) sound energy (c) nuclear energy (d) electrical energy
29. 29.💡 A battery lights 5 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) dimmer (c) the same
30. 30.⚠️ Why must we never touch switches with wet hands? (a) it spoils the paint (b) it is just untidy (c) water carries current (d) water makes it cold
31. 31.🔦 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
32. 32.True or false: a mixer grinder mainly gives out heat. (a) True (b) False
33. 33.💡 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
34. 34.💡 3 identical bulbs are joined in series with a 6 V battery (ideal wires). How many volts does each bulb get? =
35. 35.Which of these uses electricity? (a) a solar panel (b) a washing machine (c) a bicycle dynamo (d) a wind turbine
36. 36.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) False (b) True
37. 37.💡 4 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. Bulbs 1 and 2 are taken out of their holders. How many bulbs glow?
38. 38.🔍 Which is the odd one out? (a) use a cable with cuts (b) touch a switch when wet (c) fly a kite near wires (d) fly kites in open fields
39. 39.True or false: “a single current path” is true of a series circuit. (a) False (b) True
40. 40.⚡ What does a doorbell mainly change electricity into? (a) sound (b) heat (c) light (d) movement

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