Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 271 · 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.🔘 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
2. 2.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) one out, the rest glow (c) a break stops every bulb (d) a single current path
3. 3.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they keep glowing (b) they explode (c) they get dimmer (d) they all go out
4. 4.Which of these is not safe? (a) build with an adult near (b) throw cells in a fire (c) keep drinks far away (d) dry your hands first
5. 5.🔁 Is the circuit closed or open if a wire has come loose? (a) closed (b) open
6. 6.🔍 Which is the odd one out? (a) a wooden stick (b) a graphite rod (c) a rubber eraser (d) a glass marble
7. 7.True or false: “a single current path” is true of a series circuit. (a) False (b) True
8. 8.True or false: if the switch is OFF, the circuit is closed and current flows. (a) False (b) True
9. 9.Which of these uses electricity? (a) a solar panel (b) a bicycle dynamo (c) a washing machine (d) a battery
10. 10.✏️ Why do engineers draw circuits with symbols? (a) quick and clear for all (b) symbols are heavier (c) to hide the circuit (d) to make it colourful
11. 11.⚡ What do we call a flow of electric charge through a wire? (a) electric current (b) friction (c) a magnet (d) sound
12. 12.✏️ In a circuit diagram, which part is drawn as a circle with V inside? (a) bulb (b) resistor (c) motor (d) voltmeter
13. 13.🔍 Which is the odd one out? (a) a graphite rod (b) aluminium foil (c) a safety pin (d) a plastic straw
14. 14.💡 Why is house wiring done in parallel? (a) so all go off together (b) each gets full voltage (c) to make bulbs dim (d) to save copper only
15. 15.⚠️ About how many volts do home sockets in India supply? (a) 12 V (b) 1.5 V (c) 230 V (d) 9 V
16. 16.🔦 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 brass key. Does the bulb glow? (a) Yes (b) No
17. 17.True or false: “one out, the rest glow” is true of a parallel circuit. (a) False (b) True
18. 18.True or false: if a wire has come loose, the circuit is open and no current flows. (a) True (b) False
19. 19.🔘 A cell, a bulb and switches A, B and C are joined one after another in a single loop (series). A is ON, B is ON and C is OFF. Does the bulb glow? (a) Yes (b) No
20. 20.🔁 What do we call a circuit with a break in it? (a) a series circuit (b) a closed circuit (c) a full circuit (d) an open circuit
21. 21.True or false: “a break stops every bulb” is true of a series circuit. (a) True (b) False
22. 22.What does a tilt switch do? (a) slides side to side (b) flips up or down (c) closes when tipped over (d) closes near a magnet
23. 23.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) battery (b) wire (c) resistor (d) cell
24. 24.💡 4 identical bulbs are joined in series with a 10 V battery (ideal wires). How many volts does each bulb get? =
25. 25.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) none (c) one (d) two
26. 26.Which of these is safe? (a) use small battery cells (b) fly a kite near wires (c) touch a fallen wire (d) poke things in a socket
27. 27.🔍 Which is the odd one out? (a) take cells out after use (b) fly kites in open fields (c) stop if a part gets hot (d) fly a kite near wires
28. 28.💡 6 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. All the bulbs are in place. How many bulbs glow?
29. 29.💡 4 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?
30. 30.🔍 Which is the odd one out? (a) use mains for a project (b) take cells out after use (c) poke things in a socket (d) climb an electric pole
31. 31.🔋 Does a battery give electricity or use electricity? (a) gives electricity (b) uses electricity
32. 32.Which of these means the circuit is closed? (a) the loop is complete (b) a cell is taken out (c) a wire has come loose (d) the bulb is unscrewed
33. 33.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) parallel (b) series
34. 34.🔘 When a switch is ON, the circuit is … (a) closed (b) open (c) broken (d) cut
35. 35.Which of these uses electricity? (a) a cell (b) a computer (c) a power station (d) a generator
36. 36.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) an open circuit (b) a parallel circuit (c) a safe circuit (d) a short circuit
37. 37.🔋 How many 2 V cells must be joined in series to give 10 V?
38. 38.True or false: a dry cork is a conductor. (a) True (b) False
39. 39.🔋 3 identical 1.2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
40. 40.Which of these is true of a series circuit? (a) own switch for each bulb (b) one out, the rest glow (c) many paths for current (d) bulbs share the voltage

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