Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 293 · 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.🔋 How many 3 V cells must be joined in series to give 15 V?
2. 2.🔋 Identical cells side by side (in parallel) give … (a) no voltage (b) double the voltage (c) half the voltage (d) the same voltage
3. 3.Which of these is not safe? (a) dry your hands first (b) touch a switch when wet (c) build with an adult near (d) fly kites in open fields
4. 4.True or false: on a cell, “usually the black wire” means the + (positive) end. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) a metal paper clip (b) aluminium foil (c) a rubber band (d) a steel spoon
6. 6.🔍 Which is the odd one out? (a) a table fan (b) an LED lamp (c) a night lamp (d) a street light
7. 7.🔗 Series or parallel circuit: “one out, the rest glow”? (a) series (b) parallel
8. 8.True or false: “a break stops every bulb” is true of a parallel circuit. (a) True (b) False
9. 9.True or false: a plain rectangle is the symbol for a resistor. (a) True (b) False
10. 10.💡 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
11. 11.True or false: a long and a short line is the symbol for a voltmeter. (a) True (b) False
12. 12.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is ON, B is OFF, C is ON and D is OFF. Does the bulb glow? (a) Yes (b) No
13. 13.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) + (positive) (b) − (negative)
14. 14.True or false: on a cell, “usually the red wire” means the + (positive) end. (a) True (b) False
15. 15.Which of these mainly gives out heat? (a) an electric iron (b) an electric toy car (c) a torch (d) a doorbell
16. 16.True or false: if a wire is cut, the circuit is open and no current flows. (a) False (b) True
17. 17.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a copper wire across the gap. Does the bulb glow? (a) Yes (b) No
18. 18.Which drawing is the symbol for a motor? (a) a circle with an X in it (b) a circle with M inside (c) a straight line (d) a plain rectangle
19. 19.🔘 Which kind of switch flips up or down? (a) a push button (b) a reed switch (c) a toggle switch (d) a slide switch
20. 20.True or false: if the loop is complete, the circuit is closed and current flows. (a) True (b) False
21. 21.⚠️ Which power source should children use for electronics projects? (a) an inverter socket (b) a mains extension board (c) a wall socket (d) a small battery pack
22. 22.⚠️ Is it safe to touch a switch when wet? (a) not safe (b) safe
23. 23.💡 2 identical bulbs are joined in series with a 6 V battery (ideal wires). How many volts does each bulb get? =
24. 24.Which of these means the circuit is open? (a) the switch is ON (b) the loop is complete (c) the switch is OFF (d) all wires are joined
25. 25.True or false: if the switch is OFF, the circuit is closed and current flows. (a) False (b) True
26. 26.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
27. 27.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
28. 28.⚠️ Why must we never touch switches with wet hands? (a) it spoils the paint (b) it is just untidy (c) water makes it cold (d) water carries current
29. 29.True or false: if the loop is complete, the circuit is open and no current flows. (a) False (b) True
30. 30.True or false: to fly a kite near wires is not safe. (a) True (b) False
31. 31.🔘 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 ON and D is OFF. Does the bulb glow? (a) No (b) Yes
32. 32.True or false: “a single current path” is true of a parallel circuit. (a) False (b) True
33. 33.🔌 Is a rubber eraser a conductor or an insulator? (a) a conductor (b) an insulator
34. 34.True or false: “each gets the full volts” is true of a parallel circuit. (a) True (b) False
35. 35.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is ON, B is ON and C is ON. Does the bulb glow? (a) No (b) Yes
36. 36.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
37. 37.🔍 Which is the odd one out? (a) fly a kite near wires (b) stay away from pylons (c) take cells out after use (d) fly kites in open fields
38. 38.🔍 Which is the odd one out? (a) use small battery cells (b) fly a kite near wires (c) touch a fallen wire (d) open a phone charger
39. 39.💡 A battery lights 4 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
40. 40.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 3 is taken out of its holder. How many bulbs glow?

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