Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 429 · 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 should you do with used-up cells? (a) cut them open (b) bury them in soil (c) give them for recycling (d) throw them in a fire
2. 2.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a long wire (b) a fuse or MCB (c) a plug top (d) a bulb
3. 3.🔍 Which is the odd one out? (a) a woollen thread (b) a dry cork (c) aluminium foil (d) a glass marble
4. 4.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
5. 5.True or false: “bulbs share the voltage” is true of a series circuit. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) a graphite rod (b) a steel spoon (c) a rubber eraser (d) a safety pin
7. 7.Which of these is safe? (a) throw cells in a fire (b) dry your hands first (c) touch a switch when wet (d) poke things in a socket
8. 8.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) never (b) only when both are OFF (c) only when both are ON (d) when either is ON
9. 9.🔋 4 identical 3 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
10. 10.🔘 Which kind of switch flips up or down? (a) a tilt switch (b) a slide switch (c) a reed switch (d) a toggle switch
11. 11.⚡ What do we call a flow of electric charge through a wire? (a) a magnet (b) sound (c) friction (d) electric current
12. 12.💡 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?
13. 13.True or false: to open a phone charger is safe. (a) False (b) True
14. 14.🔦 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 woollen thread. Does the bulb glow? (a) No (b) Yes
15. 15.True or false: many long-short pairs is the symbol for a capacitor. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) stop if a part gets hot (b) use small battery cells (c) use mains for a project (d) take cells out after use
17. 17.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a cotton thread across the gap. Does the bulb glow? (a) No (b) Yes
18. 18.What does a slide switch do? (a) closes when tipped over (b) flips up or down (c) slides side to side (d) works only while pressed
19. 19.💡 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
20. 20.🔘 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 ON and C is ON. Does the bulb glow? (a) No (b) Yes
21. 21.🔋 How many 1.2 V cells must be joined in series to give 8.4 V?
22. 22.⚡ What does an LED lamp mainly change electricity into? (a) movement (b) heat (c) light (d) sound
23. 23.🔦 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 rubber eraser. Does the bulb glow? (a) Yes (b) No
24. 24.🔘 Which kind of switch closes near a magnet? (a) a toggle switch (b) a push button (c) a reed switch (d) a slide switch
25. 25.True or false: many long-short pairs is the symbol for a battery. (a) False (b) True
26. 26.💡 3 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?
27. 27.🔦 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 plastic straw. Does the bulb glow? (a) Yes (b) No
28. 28.🔌 Is an iron nail a conductor or an insulator? (a) a conductor (b) an insulator
29. 29.🔍 Which is the odd one out? (a) use small battery cells (b) build with an adult near (c) fly a kite near wires (d) fly kites in open fields
30. 30.🔁 What must there be for a current to flow? (a) one loose end (b) a complete loop (c) a broken path (d) a plastic gap
31. 31.Which of these is not safe? (a) fly a kite near wires (b) stay away from pylons (c) stop if a part gets hot (d) keep drinks far away
32. 32.🔌 Why are electric wires covered in plastic? (a) to make them heavy (b) plastic makes current (c) plastic is a conductor (d) plastic is an insulator
33. 33.🔁 Is the circuit closed or open if the loop is complete? (a) closed (b) open
34. 34.💡 A battery lights 3 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
35. 35.💡 6 identical bulbs are in parallel and each one takes 1 A. What total current (in amperes) comes from the battery? =
36. 36.🔋 A 9 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
37. 37.Which of these is safe? (a) touch a switch when wet (b) throw cells in a fire (c) climb an electric pole (d) stop if a part gets hot
38. 38.Which drawing is the symbol for a bulb? (a) a plain rectangle (b) triangle, bar and arrows (c) a dot where wires meet (d) a circle with an X in it
39. 39.True or false: to use a cable with cuts is not safe. (a) False (b) True
40. 40.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) in series (c) not joined (d) in parallel

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