Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 180 · 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.💡 3 identical bulbs are joined in parallel across a 1.5 V battery (ideal wires). How many volts does each bulb get? =
2. 2.True or false: “each gets the full volts” is true of a series circuit. (a) True (b) False
3. 3.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a glass marble across the gap. Does the bulb glow? (a) No (b) Yes
4. 4.⚠️ Is it safe to keep drinks far away? (a) safe (b) not safe
5. 5.💡 3 identical bulbs are in parallel and each one takes 0.1 A. What total current (in amperes) comes from the battery? =
6. 6.🔗 Series or parallel circuit: “one out, the rest glow”? (a) series (b) parallel
7. 7.🔁 What do we call a circuit with a break in it? (a) a series circuit (b) a full circuit (c) an open circuit (d) a closed circuit
8. 8.🔋 2 identical 3 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
9. 9.Which of these is true of a series circuit? (a) many paths for current (b) own switch for each bulb (c) each gets the full volts (d) a break stops every bulb
10. 10.⚡ What does a tube light mainly change electricity into? (a) light (b) movement (c) sound (d) heat
11. 11.⚠️ Which power source should children use for electronics projects? (a) an inverter socket (b) a wall socket (c) a mains extension board (d) a small battery pack
12. 12.True or false: “used in house wiring” is true of a parallel circuit. (a) True (b) False
13. 13.🔌 Is a paper strip a conductor or an insulator? (a) a conductor (b) an insulator
14. 14.🔌 Which metal is used for most electric wires at home? (a) plastic (b) glass (c) copper (d) rubber
15. 15.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they keep glowing (c) they all go out (d) they explode
16. 16.💡 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
17. 17.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) a wire has come loose (c) the switch is OFF (d) all wires are joined
18. 18.🔋 6 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
19. 19.💡 5 identical bulbs are joined in parallel across a 6 V battery (ideal wires). How many volts does each bulb get? =
20. 20.Which drawing is the symbol for a battery? (a) a circle with a cross (b) a long and a short line (c) two equal parallel lines (d) many long-short pairs
21. 21.🔘 A cell and a bulb are joined to 4 side-by-side paths with one switch on each path — A, B, C and D (parallel). A is OFF, B is ON, C is OFF and D is OFF. Does the bulb glow? (a) No (b) Yes
22. 22.✏️ 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
23. 23.🔁 Is the circuit closed or open if all wires are joined? (a) open (b) closed
24. 24.💡 5 identical bulbs are joined in series with a 7.5 V battery (ideal wires). How many volts does each bulb get? =
25. 25.Which of these is safe? (a) use mains for a project (b) throw cells in a fire (c) dry your hands first (d) poke things in a socket
26. 26.True or false: “bulbs share the voltage” is true of a series circuit. (a) False (b) True
27. 27.🔌 Which part of a screwdriver should an electrician hold? (a) the bare end (b) the plastic handle (c) the metal tip (d) the steel shaft
28. 28.⚡ What do we call a flow of electric charge through a wire? (a) a magnet (b) electric current (c) sound (d) friction
29. 29.True or false: triangle, bar and arrows is the symbol for a diode. (a) True (b) False
30. 30.Which of these mainly makes sound? (a) a loudspeaker (b) a ceiling fan (c) an electric toy car (d) a traffic signal
31. 31.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) not joined (b) in parallel (c) in series (d) by Wi-Fi
32. 32.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) a short circuit (b) an open circuit (c) a parallel circuit (d) a safe circuit
33. 33.True or false: “a single current path” is true of a series circuit. (a) False (b) True
34. 34.🔌 Is a plastic straw a conductor or an insulator? (a) a conductor (b) an insulator
35. 35.🔋 6 identical 2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
36. 36.Which of these is true of a parallel circuit? (a) a single current path (b) bulbs share the voltage (c) many paths for current (d) one bulb out, all go out
37. 37.💡 A battery lights 4 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
38. 38.🔘 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 OFF, B is ON and C is OFF. Does the bulb glow? (a) Yes (b) No
39. 39.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) + (positive) (b) − (negative)
40. 40.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a bulb (b) a plug top (c) a fuse or MCB (d) a long wire

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