Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 22 · 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 2 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
2. 2.⚠️ Is it safe to open a phone charger? (a) safe (b) not safe
3. 3.🔘 When a switch is ON, the circuit is … (a) open (b) closed (c) cut (d) broken
4. 4.💡 Why is house wiring done in parallel? (a) so all go off together (b) to save copper only (c) to make bulbs dim (d) each gets full voltage
5. 5.🔋 8 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)? =
6. 6.🔦 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 brass key. Does the bulb glow? (a) Yes (b) No
7. 7.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. How many bulbs glow?
8. 8.True or false: a long and a short line is the symbol for a cell. (a) True (b) False
9. 9.🔋 5 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
10. 10.💡 4 identical bulbs are in parallel and each bulb has its own switch on its path. 2 of the switches are OFF and the rest are ON. How many bulbs glow?
11. 11.True or false: a line lifted at a gap is the symbol for a switch. (a) True (b) False
12. 12.Which of these is not safe? (a) use small battery cells (b) fly kites in open fields (c) dry your hands first (d) climb an electric pole
13. 13.⚠️ Who should be with you when you build a circuit? (a) a younger child (b) nobody (c) a trusted adult (d) a stranger online
14. 14.🔋 How many 1.5 V cells must be joined in series to give 9 V?
15. 15.🔌 Is a dry cork a conductor or an insulator? (a) an insulator (b) a conductor
16. 16.⚡ A fan changes electrical energy mainly into which kind of energy? (a) light energy (b) chemical energy (c) movement energy (d) sound energy
17. 17.⚠️ Is it safe to build with an adult near? (a) not safe (b) safe
18. 18.🔘 Which kind of switch springs back when let go? (a) a push button (b) a toggle switch (c) a slide switch (d) a tilt switch
19. 19.Which drawing is the symbol for a capacitor? (a) a long and a short line (b) two equal parallel lines (c) a circle with an X in it (d) a dot where wires meet
20. 20.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) + (positive) (b) − (negative)
21. 21.True or false: if all wires are joined, the circuit is open and no current flows. (a) False (b) True
22. 22.⚡ What does a traffic signal mainly change electricity into? (a) heat (b) movement (c) sound (d) light
23. 23.🔍 Which is the odd one out? (a) an electric kettle (b) a doorbell (c) a buzzer (d) a loudspeaker
24. 24.True or false: to fly a kite near wires is safe. (a) True (b) False
25. 25.🔋 What is a battery? (a) a kind of bulb (b) a switch with a lid (c) one single wire (d) two or more cells joined
26. 26.What does a toggle switch do? (a) flips up or down (b) springs back when let go (c) closes when tipped over (d) works only while pressed
27. 27.🔘 Switch A is on the main wire next to the cell and the bulb; then the wire splits into two side-by-side paths, one with switch B and one with switch C. A is ON, B is OFF and C is OFF. Does the bulb glow? (a) Yes (b) No
28. 28.True or false: to keep drinks far away is not safe. (a) False (b) True
29. 29.Which drawing is the symbol for an ammeter? (a) a circle with A inside (b) a circle with an X in it (c) two equal parallel lines (d) two or more cell symbols
30. 30.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
31. 31.What does a reed switch do? (a) flips up or down (b) closes near a magnet (c) slides side to side (d) stays where you flip it
32. 32.Which drawing is the symbol for a junction? (a) a plain rectangle (b) a circle with M inside (c) two equal parallel lines (d) a dot where wires meet
33. 33.Which of these is true of a parallel circuit? (a) own switch for each bulb (b) one bulb out, all go out (c) a break stops every bulb (d) a single current path
34. 34.🔋 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)? =
35. 35.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) to make it colourful (c) to hide the circuit (d) quick and clear for all
36. 36.True or false: a wooden stick is a conductor. (a) True (b) False
37. 37.⚡ What does a street light mainly change electricity into? (a) light (b) sound (c) movement (d) heat
38. 38.True or false: on a cell, “the flat end” means the + (positive) end. (a) False (b) True
39. 39.🔘 Which kind of switch works only while pressed? (a) a slide switch (b) a push button (c) a toggle switch (d) a tilt switch
40. 40.⚠️ Is it safe to touch a switch when wet? (a) safe (b) not safe

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