Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 648 · 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.🔍 Which is the odd one out? (a) an LED lamp (b) an electric drill (c) an electric toy car (d) a mixer grinder
2. 2.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a steel coin across the gap. Does the bulb glow? (a) Yes (b) No
3. 3.Which of these is true of a parallel circuit? (a) own switch for each bulb (b) a single current path (c) one bulb out, all go out (d) bulbs share the voltage
4. 4.🔍 Which is the odd one out? (a) a school bell (b) a tube light (c) a buzzer (d) a siren
5. 5.🔍 Which is the odd one out? (a) fly a kite near wires (b) build with an adult near (c) fly kites in open fields (d) stay away from pylons
6. 6.Which of these is an insulator? (a) a dry cork (b) a graphite rod (c) a brass key (d) a safety pin
7. 7.🔋 5 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
8. 8.🔁 Is the circuit closed or open if the switch is ON? (a) closed (b) open
9. 9.⚠️ Is it safe to open a phone charger? (a) safe (b) not safe
10. 10.🔋 3 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)? =
11. 11.💡 A battery lights 2 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
12. 12.True or false: a circle with an X in it is the symbol for a motor. (a) True (b) False
13. 13.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) True (b) False
14. 14.Which of these gives us electricity? (a) a generator (b) a computer (c) a water pump (d) a refrigerator
15. 15.True or false: to climb an electric pole is not safe. (a) False (b) True
16. 16.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) + (positive) (b) − (negative)
17. 17.💡 Why is house wiring done in parallel? (a) so all go off together (b) to make bulbs dim (c) each gets full voltage (d) to save copper only
18. 18.Which of these mainly gives out heat? (a) a torch (b) an LED lamp (c) a table fan (d) an electric iron
19. 19.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
20. 20.🔘 A bulb and a cell are joined through 6 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
21. 21.🔍 Which is the odd one out? (a) a cotton thread (b) a rubber band (c) a wooden stick (d) a safety pin
22. 22.⚠️ Which power source should children use for electronics projects? (a) a wall socket (b) an inverter socket (c) a mains extension board (d) a small battery pack
23. 23.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. Does bulb 2 glow? (a) Yes (b) No
24. 24.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
25. 25.🔘 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 OFF. Does the bulb glow? (a) Yes (b) No
26. 26.Which of these means the circuit is open? (a) all wires are joined (b) the loop is complete (c) the switch is ON (d) a wire is cut
27. 27.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) to make it colourful (c) quick and clear for all (d) to hide the circuit
28. 28.Which of these means the circuit is open? (a) all wires are joined (b) the loop is complete (c) the switch is ON (d) a wire has come loose
29. 29.⚠️ 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
30. 30.Which of these gives us electricity? (a) a computer (b) a cell (c) a water pump (d) a refrigerator
31. 31.🔍 Which is the odd one out? (a) use a cable with cuts (b) touch a fallen wire (c) keep drinks far away (d) open a phone charger
32. 32.⚡ What does a buzzer mainly change electricity into? (a) movement (b) light (c) heat (d) sound
33. 33.True or false: “many paths for current” is true of a series circuit. (a) True (b) False
34. 34.🔗 Series or parallel circuit: “each gets the full volts”? (a) parallel (b) series
35. 35.💡 3 identical bulbs are in parallel and each one takes 0.1 A. What total current (in amperes) comes from the battery? =
36. 36.True or false: to fly a kite near wires is safe. (a) False (b) True
37. 37.True or false: a wooden stick is an insulator. (a) False (b) True
38. 38.True or false: many long-short pairs is the symbol for a junction. (a) False (b) True
39. 39.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) diode (b) switch (c) wire (d) bulb
40. 40.🔍 Which is the odd one out? (a) touch a fallen wire (b) build with an adult near (c) take cells out after use (d) fly kites in open fields

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