Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 438 · 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.🔋 2 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
2. 2.🔋 3 identical 3 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
3. 3.🔗 Series or parallel circuit: “many paths for current”? (a) parallel (b) series
4. 4.✏️ In a circuit diagram, wires are usually drawn as … (a) wavy lines (b) dotted circles (c) straight lines (d) little stars
5. 5.Which of these is not safe? (a) stay away from pylons (b) use small battery cells (c) take cells out after use (d) fly a kite near wires
6. 6.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) only one (b) none (c) both of them (d) it does not matter
7. 7.✏️ In a cell symbol, which line is the + terminal? (a) both lines (b) neither line (c) the shorter line (d) the longer line
8. 8.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they all go out (c) they keep glowing (d) they explode
9. 9.🔋 6 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)? =
10. 10.🔌 Is a copper wire a conductor or an insulator? (a) an insulator (b) a conductor
11. 11.True or false: “many paths for current” is true of a parallel circuit. (a) False (b) True
12. 12.Which of these means the circuit is open? (a) a wire has come loose (b) the switch is ON (c) all wires are joined (d) the loop is complete
13. 13.True or false: a slide switch springs back when let go. (a) True (b) False
14. 14.🔘 Which kind of switch springs back when let go? (a) a toggle switch (b) a tilt switch (c) a slide switch (d) a push button
15. 15.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
16. 16.🔘 A bulb and a cell are joined through 6 switches on 6 side-by-side paths, one switch on each path (parallel). What is the smallest number of switches that must be ON to light the bulb?
17. 17.Which drawing is the symbol for an ammeter? (a) a long and a short line (b) a circle with A inside (c) a circle with V inside (d) a line lifted at a gap
18. 18.⚠️ Is it safe to touch a switch when wet? (a) safe (b) not safe
19. 19.💡 2 identical bulbs are in parallel and each one takes 0.1 A. What total current (in amperes) comes from the battery? =
20. 20.Which drawing is the symbol for a wire? (a) two or more cell symbols (b) many long-short pairs (c) a straight line (d) a circle with an X in it
21. 21.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by an iron nail. Does the bulb glow? (a) Yes (b) No
22. 22.True or false: a dot where wires meet is the symbol for a junction. (a) False (b) True
23. 23.⚠️ Why must we never touch switches with wet hands? (a) water makes it cold (b) water carries current (c) it spoils the paint (d) it is just untidy
24. 24.Which of these uses electricity? (a) a mobile phone (b) a cell (c) a power station (d) a solar panel
25. 25.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the filament (b) the switch (c) the glass (d) the base
26. 26.True or false: a tilt switch stays where you flip it. (a) False (b) True
27. 27.True or false: if the bulb is unscrewed, the circuit is closed and current flows. (a) True (b) False
28. 28.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
29. 29.🔍 Which is the odd one out? (a) a siren (b) a school bell (c) a doorbell (d) a tube light
30. 30.⚠️ Which power source should children use for electronics projects? (a) a mains extension board (b) a small battery pack (c) an inverter socket (d) a wall socket
31. 31.🔁 Is the circuit closed or open if the switch is OFF? (a) closed (b) open
32. 32.Which of these is an insulator? (a) a brass key (b) an iron nail (c) a cotton thread (d) a copper wire
33. 33.🔍 Which is the odd one out? (a) an LED lamp (b) a siren (c) a buzzer (d) a loudspeaker
34. 34.True or false: on a cell, “the shorter symbol line” means the − (negative) end. (a) True (b) False
35. 35.🔘 Which kind of switch works only while pressed? (a) a tilt switch (b) a toggle switch (c) a reed switch (d) a push button
36. 36.True or false: one tall, one short bar is the symbol for a voltmeter. (a) False (b) True
37. 37.🔘 A cell and a bulb are joined to 2 side-by-side paths with one switch on each path — A and B (parallel). A is ON and B is OFF. Does the bulb glow? (a) Yes (b) No
38. 38.Which of these is an insulator? (a) a copper wire (b) an iron nail (c) aluminium foil (d) a wooden stick
39. 39.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
40. 40.🔍 Which is the odd one out? (a) dry your hands first (b) take cells out after use (c) build with an adult near (d) use mains for a project

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