Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 454 · 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 of these gives us electricity? (a) a television (b) a water pump (c) a computer (d) a wind turbine
2. 2.Which of these is true of a series circuit? (a) own switch for each bulb (b) many paths for current (c) each gets the full volts (d) one bulb out, all go out
3. 3.Which of these is safe? (a) poke things in a socket (b) fly kites in open fields (c) touch a fallen wire (d) open a phone charger
4. 4.💡 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?
5. 5.🔦 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
6. 6.🔘 What does a switch do in a circuit? (a) changes the voltage (b) makes electricity (c) opens or closes the loop (d) stores current
7. 7.🔋 2 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)? =
8. 8.Which of these means the circuit is closed? (a) a cell is taken out (b) all wires are joined (c) a wire has come loose (d) the bulb is unscrewed
9. 9.Which drawing is the symbol for a motor? (a) triangle, bar and arrows (b) a plain rectangle (c) a circle with M inside (d) a dot where wires meet
10. 10.💡 A battery lights 3 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
11. 11.🔍 Which is the odd one out? (a) open a phone charger (b) throw cells in a fire (c) touch a fallen wire (d) dry your hands first
12. 12.What does a tilt switch do? (a) springs back when let go (b) flips up or down (c) stays where you flip it (d) closes when tipped over
13. 13.⚠️ Who should be with you when you build a circuit? (a) a trusted adult (b) a stranger online (c) a younger child (d) nobody
14. 14.🔌 Which part of a screwdriver should an electrician hold? (a) the plastic handle (b) the metal tip (c) the steel shaft (d) the bare end
15. 15.⚡ A fan changes electrical energy mainly into which kind of energy? (a) sound energy (b) chemical energy (c) light energy (d) movement energy
16. 16.🔋 4 identical 3 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
17. 17.🔌 Is a graphite rod a conductor or an insulator? (a) an insulator (b) a conductor
18. 18.Which of these mainly makes movement? (a) a siren (b) a traffic signal (c) a ceiling fan (d) a toaster
19. 19.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
20. 20.✏️ In a circuit diagram, which part is drawn as a long and a short line? (a) cell (b) junction (c) LED (d) bulb
21. 21.🔋 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)? =
22. 22.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) + (positive) (b) − (negative)
23. 23.True or false: a tube light mainly makes sound. (a) False (b) True
24. 24.True or false: “a break stops every bulb” is true of a parallel circuit. (a) False (b) True
25. 25.Which drawing is the symbol for a bulb? (a) many long-short pairs (b) a circle with M inside (c) two equal parallel lines (d) a circle with a cross
26. 26.🔘 Two switches are in series. When does the bulb glow? (a) when either is ON (b) never (c) when both are OFF (d) when both are ON
27. 27.🔋 What should you do with used-up cells? (a) bury them in soil (b) cut them open (c) give them for recycling (d) throw them in a fire
28. 28.True or false: if a wire is cut, the circuit is closed and current flows. (a) False (b) True
29. 29.🔘 When a switch is ON, the circuit is … (a) broken (b) cut (c) open (d) closed
30. 30.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put an iron nail across the gap. Does the bulb glow? (a) No (b) Yes
31. 31.💡 5 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?
32. 32.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
33. 33.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) open (b) closed
34. 34.💡 Why is house wiring done in parallel? (a) each gets full voltage (b) to save copper only (c) to make bulbs dim (d) so all go off together
35. 35.Which of these means the circuit is open? (a) all wires are joined (b) the switch is ON (c) the loop is complete (d) a wire has come loose
36. 36.✏️ In a circuit diagram, which part is drawn as a straight line? (a) motor (b) wire (c) bulb (d) capacitor
37. 37.💡 2 identical bulbs are in parallel and each one takes 0.25 A. What total current (in amperes) comes from the battery? =
38. 38.✏️ In a circuit diagram, which part is drawn as triangle against a bar? (a) switch (b) diode (c) bulb (d) ammeter
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) dimmer (c) brighter
40. 40.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) − (negative) (b) + (positive)

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