Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 224 · 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.True or false: if the switch is OFF, the circuit is closed and current flows. (a) True (b) False
2. 2.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
3. 3.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
4. 4.True or false: to throw cells in a fire is not safe. (a) True (b) False
5. 5.Which of these means the circuit is open? (a) the loop is complete (b) the switch is ON (c) all wires are joined (d) a wire is cut
6. 6.Which of these is safe? (a) use a cable with cuts (b) touch a switch when wet (c) dry your hands first (d) touch a fallen wire
7. 7.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a safety pin across the gap. Does the bulb glow? (a) Yes (b) No
8. 8.🔍 Which is the odd one out? (a) a water heater (b) a toaster (c) an electric iron (d) a night lamp
9. 9.🔗 Series or parallel circuit: “a break stops every bulb”? (a) parallel (b) series
10. 10.Which drawing is the symbol for a motor? (a) many long-short pairs (b) triangle, bar and arrows (c) a circle with M inside (d) a circle with a cross
11. 11.Which of these mainly makes movement? (a) a tube light (b) a loudspeaker (c) a mixer grinder (d) a room heater
12. 12.💡 A battery lights 3 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
13. 13.💡 3 identical bulbs are joined in parallel across a 3 V battery (ideal wires). How many volts does each bulb get? =
14. 14.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) cell (b) motor (c) LED (d) voltmeter
15. 15.💡 5 identical bulbs are joined in series with a 7.5 V battery (ideal wires). How many volts does each bulb get? =
16. 16.⚠️ Which power source should children use for electronics projects? (a) a small battery pack (b) a mains extension board (c) a wall socket (d) an inverter socket
17. 17.True or false: a line lifted at a gap is the symbol for a resistor. (a) True (b) False
18. 18.True or false: if the bulb is unscrewed, the circuit is closed and current flows. (a) False (b) True
19. 19.Which of these means the circuit is open? (a) the switch is OFF (b) all wires are joined (c) the switch is ON (d) the loop is complete
20. 20.True or false: to poke things in a socket is not safe. (a) True (b) False
21. 21.⚠️ About how many volts do home sockets in India supply? (a) 9 V (b) 12 V (c) 1.5 V (d) 230 V
22. 22.💡 4 identical bulbs are in parallel and each one takes 1.5 A. What total current (in amperes) comes from the battery? =
23. 23.True or false: two equal parallel lines is the symbol for a switch. (a) True (b) False
24. 24.🔋 Does a generator give electricity or use electricity? (a) gives electricity (b) uses electricity
25. 25.🔁 Is the circuit closed or open if all wires are joined? (a) open (b) closed
26. 26.🔌 Is a woollen thread a conductor or an insulator? (a) an insulator (b) a conductor
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) No (b) Yes
28. 28.🔍 Which is the odd one out? (a) use small battery cells (b) stay away from pylons (c) dry your hands first (d) poke things in a socket
29. 29.🔘 What does a switch do in a circuit? (a) changes the voltage (b) stores current (c) makes electricity (d) opens or closes the loop
30. 30.🔘 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
31. 31.⚡ A fan changes electrical energy mainly into which kind of energy? (a) chemical energy (b) movement energy (c) light energy (d) sound energy
32. 32.🔋 What should you do with used-up cells? (a) give them for recycling (b) throw them in a fire (c) bury them in soil (d) cut them open
33. 33.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
34. 34.⚡ What does a table fan mainly change electricity into? (a) heat (b) sound (c) movement (d) light
35. 35.✏️ In a cell symbol, which line is the + terminal? (a) the longer line (b) neither line (c) both lines (d) the shorter line
36. 36.🔋 A 9 V battery and one 1.5 V cell are joined in series, all facing the same way. What is the total voltage (in volts)? =
37. 37.💡 A battery lights 3 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
38. 38.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) brighter (b) dimmer (c) the same
39. 39.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is OFF, B is OFF, C is OFF and D is OFF. Does the bulb glow? (a) No (b) Yes
40. 40.🔦 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 safety pin. Does the bulb glow? (a) No (b) Yes

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