Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 66 · 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.💡 5 identical bulbs are joined in parallel across a 1.5 V battery (ideal wires). How many volts does each bulb get? =
2. 2.✏️ Why do engineers draw circuits with symbols? (a) to make it colourful (b) to hide the circuit (c) quick and clear for all (d) symbols are heavier
3. 3.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) not joined (c) in series (d) in parallel
4. 4.🔍 Which is the odd one out? (a) a dry cork (b) a cotton thread (c) a wooden stick (d) a brass key
5. 5.True or false: a doorbell mainly makes sound. (a) False (b) True
6. 6.🔁 Is the circuit closed or open if all wires are joined? (a) closed (b) open
7. 7.True or false: to touch a fallen wire is not safe. (a) False (b) True
8. 8.🔦 A circuit has a new cell, a bulb with a broken filament 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) No (b) Yes
9. 9.True or false: “many paths for current” is true of a parallel circuit. (a) True (b) False
10. 10.What does a tilt switch do? (a) slides side to side (b) closes when tipped over (c) flips up or down (d) closes near a magnet
11. 11.💡 Why is house wiring done in parallel? (a) to save copper only (b) so all go off together (c) each gets full voltage (d) to make bulbs dim
12. 12.True or false: if all wires are joined, the circuit is open and no current flows. (a) False (b) True
13. 13.True or false: a safety pin is an insulator. (a) True (b) False
14. 14.Which of these is a conductor? (a) a paper strip (b) aluminium foil (c) a woollen thread (d) a plastic ruler
15. 15.🔁 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
16. 16.True or false: to climb an electric pole is not safe. (a) False (b) True
17. 17.🔦 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 plastic straw. Does the bulb glow? (a) No (b) Yes
18. 18.🔋 3 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.🔋 8 identical 3 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
20. 20.Which of these is true of a parallel circuit? (a) many paths for current (b) bulbs share the voltage (c) a single current path (d) a break stops every bulb
21. 21.True or false: if the switch is ON, the circuit is open and no current flows. (a) True (b) False
22. 22.💡 In a series circuit, how many paths does the current have? (a) two (b) one for each bulb (c) one (d) none
23. 23.True or false: an electric drill mainly gives out light. (a) False (b) True
24. 24.⚠️ Who should be with you when you build a circuit? (a) nobody (b) a younger child (c) a stranger online (d) a trusted adult
25. 25.Which of these mainly makes sound? (a) a siren (b) a torch (c) an electric drill (d) a ceiling fan
26. 26.🔘 A bulb and a cell are joined through 3 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
27. 27.True or false: “used in house wiring” is true of a series circuit. (a) False (b) True
28. 28.🔌 Most metals are good … (a) conductors (b) insulators (c) magnets only (d) batteries
29. 29.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
30. 30.Which drawing is the symbol for a junction? (a) a plain rectangle (b) a circle with M inside (c) a circle with an X in it (d) a dot where wires meet
31. 31.🔋 What is a battery? (a) a kind of bulb (b) two or more cells joined (c) a switch with a lid (d) one single wire
32. 32.🔍 Which is the odd one out? (a) a mixer grinder (b) a ceiling fan (c) an exhaust fan (d) a loudspeaker
33. 33.🔁 What must there be for a current to flow? (a) a broken path (b) one loose end (c) a complete loop (d) a plastic gap
34. 34.Which of these gives us electricity? (a) a television (b) a refrigerator (c) a cell (d) a washing machine
35. 35.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) + (positive) (b) − (negative)
36. 36.💡 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
37. 37.True or false: a night lamp mainly gives out light. (a) True (b) False
38. 38.💡 5 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. Bulb 2 is taken out of its holder. Does bulb 4 glow? (a) No (b) Yes
39. 39.Which of these is safe? (a) use a cable with cuts (b) poke things in a socket (c) touch a fallen wire (d) keep drinks far away
40. 40.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed

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