Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 857 · 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.⚠️ Is it safe to fly kites in open fields? (a) safe (b) not safe
2. 2.True or false: a steel coin is an insulator. (a) True (b) False
3. 3.🔋 How many 2 V cells must be joined in series to give 16 V?
4. 4.🔋 3 identical 1.2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
5. 5.Which of these is not safe? (a) use small battery cells (b) build with an adult near (c) throw cells in a fire (d) fly kites in open fields
6. 6.True or false: to fly kites in open fields is not safe. (a) True (b) False
7. 7.💡 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?
8. 8.Which of these gives us electricity? (a) a solar panel (b) a water pump (c) a refrigerator (d) a washing machine
9. 9.🔦 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) Yes (b) No
10. 10.🔦 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 safety pin. Does the bulb glow? (a) No (b) Yes
11. 11.🔘 Which kind of switch works only while pressed? (a) a reed switch (b) a tilt switch (c) a push button (d) a toggle switch
12. 12.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are ON (b) when either is ON (c) only when both are OFF (d) never
13. 13.Which of these is safe? (a) fly a kite near wires (b) use a cable with cuts (c) stop if a part gets hot (d) touch a switch when wet
14. 14.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) + (positive) (b) − (negative)
15. 15.💡 A battery lights 5 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) dimmer (c) the same
16. 16.⚡ What does a siren mainly change electricity into? (a) heat (b) movement (c) light (d) sound
17. 17.💡 In a series circuit, how many paths does the current have? (a) two (b) none (c) one (d) one for each bulb
18. 18.True or false: to keep drinks far away is not safe. (a) True (b) False
19. 19.Which of these is an insulator? (a) a metal paper clip (b) a paper strip (c) a brass key (d) a graphite rod
20. 20.✏️ In a circuit diagram, which part is drawn as a circle with V inside? (a) junction (b) LED (c) voltmeter (d) cell
21. 21.True or false: on a cell, “the shorter symbol line” means the − (negative) end. (a) True (b) False
22. 22.💡 4 identical bulbs are in parallel and each bulb has its own switch on its path. 2 of the switches are OFF and the rest are ON. How many bulbs glow?
23. 23.Which of these means the circuit is open? (a) all wires are joined (b) a wire has come loose (c) the loop is complete (d) the switch is ON
24. 24.True or false: an LED lamp mainly makes movement. (a) True (b) False
25. 25.Which drawing is the symbol for a bulb? (a) a line lifted at a gap (b) one tall, one short bar (c) a circle with a cross (d) two or more cell symbols
26. 26.🔘 A bulb and a cell are joined through 2 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.🔍 Which is the odd one out? (a) stop if a part gets hot (b) fly a kite near wires (c) use small battery cells (d) dry your hands first
28. 28.🔋 How many 1.5 V cells must be joined in series to give 3 V?
29. 29.True or false: on a cell, “the longer symbol line” means the + (positive) end. (a) True (b) False
30. 30.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is ON and B is OFF. Does the bulb glow? (a) No (b) Yes
31. 31.True or false: a tilt switch closes when tipped over. (a) True (b) False
32. 32.⚠️ Someone is getting a shock and is still touching a wire. What should you do? (a) pour water on them (b) wait and watch (c) pull them by the hand (d) shout for an adult
33. 33.True or false: to poke things in a socket is safe. (a) True (b) False
34. 34.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. Does bulb 3 glow? (a) Yes (b) No
35. 35.True or false: “one out, the rest glow” is true of a series circuit. (a) False (b) True
36. 36.🔋 Cells joined + to − in a row (series) give … (a) a smaller voltage (b) the same voltage (c) no voltage (d) a bigger voltage
37. 37.🔦 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 dry cork. Does the bulb glow? (a) No (b) Yes
38. 38.🔘 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 OFF and C is ON. Does the bulb glow? (a) No (b) Yes
39. 39.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they keep glowing (c) they all go out (d) they explode
40. 40.Which of these mainly gives out heat? (a) a doorbell (b) a night lamp (c) a siren (d) an electric iron

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