Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 215 · 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 is true of a parallel circuit? (a) each gets the full volts (b) a break stops every bulb (c) a single current path (d) one bulb out, all go out
2. 2.Which of these is true of a series circuit? (a) own switch for each bulb (b) used in house wiring (c) each gets the full volts (d) a single current path
3. 3.💡 In a series circuit, how many paths does the current have? (a) one (b) two (c) none (d) one for each bulb
4. 4.True or false: if a cell is taken out, the circuit is closed and current flows. (a) False (b) True
5. 5.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) one bulb out, all go out (c) own switch for each bulb (d) a single current path
6. 6.🔁 Is the circuit closed or open if the loop is complete? (a) closed (b) open
7. 7.⚠️ Is it safe to use a cable with cuts? (a) not safe (b) safe
8. 8.⚡ What does an LED lamp mainly change electricity into? (a) heat (b) light (c) sound (d) movement
9. 9.🔍 Which is the odd one out? (a) a torch (b) a traffic signal (c) a mixer grinder (d) a night lamp
10. 10.🔌 Is a brass key a conductor or an insulator? (a) an insulator (b) a conductor
11. 11.💡 4 identical bulbs are joined in parallel across a 4.5 V battery (ideal wires). How many volts does each bulb get? =
12. 12.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are OFF (b) when either is ON (c) never (d) only when both are ON
13. 13.What does a tilt switch do? (a) closes near a magnet (b) closes when tipped over (c) flips up or down (d) slides side to side
14. 14.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) False (b) True
15. 15.Which drawing is the symbol for a junction? (a) a circle with V inside (b) one tall, one short bar (c) a small empty box (d) a dot where wires meet
16. 16.True or false: a reed switch closes near a magnet. (a) True (b) False
17. 17.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) all wires are joined (c) the switch is OFF (d) a wire has come loose
18. 18.🔍 Which is the odd one out? (a) a wooden stick (b) a plastic ruler (c) a steel coin (d) a paper strip
19. 19.🔌 Is a metal paper clip a conductor or an insulator? (a) a conductor (b) an insulator
20. 20.✏️ In a circuit diagram, which part is drawn as a dot where wires meet? (a) junction (b) diode (c) resistor (d) capacitor
21. 21.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) bulb (b) cell (c) junction (d) battery
22. 22.Which of these mainly makes sound? (a) a water heater (b) a siren (c) a night lamp (d) an electric iron
23. 23.💡 5 identical bulbs are joined in series with a 10 V battery (ideal wires). How many volts does each bulb get? =
24. 24.💡 A battery lights 4 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
25. 25.💡 5 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?
26. 26.⚠️ Is it safe to take cells out after use? (a) safe (b) not safe
27. 27.True or false: a torch mainly makes movement. (a) True (b) False
28. 28.🔘 Which kind of switch springs back when let go? (a) a tilt switch (b) a push button (c) a reed switch (d) a slide switch
29. 29.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) ammeter (b) voltmeter (c) cell (d) battery
30. 30.🔁 What must there be for a current to flow? (a) a plastic gap (b) a complete loop (c) one loose end (d) a broken path
31. 31.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by a rubber eraser. Does the bulb glow? (a) No (b) Yes
32. 32.Which of these gives us electricity? (a) a refrigerator (b) a wind turbine (c) a mobile phone (d) a washing machine
33. 33.💡 6 identical bulbs are in parallel and each one takes 1.5 A. What total current (in amperes) comes from the battery? =
34. 34.True or false: to use small battery cells is not safe. (a) True (b) False
35. 35.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 2 glow? (a) No (b) Yes
36. 36.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) both lines (c) neither line (d) the longer line
37. 37.🔋 3 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
38. 38.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in parallel (b) in series (c) by Wi-Fi (d) not joined
39. 39.Which of these is safe? (a) use mains for a project (b) dry your hands first (c) fly a kite near wires (d) use a cable with cuts
40. 40.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)

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