Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 259 · 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.True or false: if all wires are joined, the circuit is closed and current flows. (a) False (b) True
2. 2.💡 3 identical bulbs are joined in parallel across a 12 V battery (ideal wires). How many volts does each bulb get? =
3. 3.⚠️ Is it safe to touch a fallen wire? (a) not safe (b) safe
4. 4.🔋 3 identical 3 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.🔘 A cell and a bulb are joined to 4 side-by-side paths with one switch on each path — A, B, C and D (parallel). A is ON, B is OFF, C is OFF and D is ON. Does the bulb glow? (a) No (b) Yes
6. 6.🔌 Is a steel spoon a conductor or an insulator? (a) an insulator (b) a conductor
7. 7.✏️ In a circuit diagram, wires are usually drawn as … (a) straight lines (b) little stars (c) wavy lines (d) dotted circles
8. 8.Which of these is true of a series circuit? (a) each gets the full volts (b) used in house wiring (c) a single current path (d) many paths for current
9. 9.🔋 2 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
10. 10.⚠️ Is it safe to open a phone charger? (a) safe (b) not safe
11. 11.Which drawing is the symbol for an LED? (a) two or more cell symbols (b) one tall, one short bar (c) triangle, bar and arrows (d) a dot where wires meet
12. 12.💡 2 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. How many bulbs glow?
13. 13.True or false: a plastic straw is a conductor. (a) False (b) True
14. 14.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in parallel (b) by Wi-Fi (c) in series (d) not joined
15. 15.🔁 Is the circuit closed or open if a cell is taken out? (a) closed (b) open
16. 16.True or false: a graphite rod is a conductor. (a) True (b) False
17. 17.Which of these is not safe? (a) poke things in a socket (b) use small battery cells (c) stop if a part gets hot (d) take cells out after use
18. 18.⚡ What does a mixer grinder mainly change electricity into? (a) movement (b) heat (c) sound (d) light
19. 19.True or false: a room heater mainly gives out heat. (a) False (b) True
20. 20.🔋 Identical cells side by side (in parallel) give … (a) no voltage (b) half the voltage (c) double the voltage (d) the same voltage
21. 21.True or false: “many paths for current” is true of a parallel circuit. (a) False (b) True
22. 22.💡 A battery lights 5 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
23. 23.✏️ In a circuit diagram, which part is drawn as a small empty box? (a) resistor (b) capacitor (c) switch (d) wire
24. 24.True or false: one tall, one short bar is the symbol for a voltmeter. (a) True (b) False
25. 25.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a graphite rod. Does the bulb glow? (a) Yes (b) No
26. 26.True or false: a push button works only while pressed. (a) False (b) True
27. 27.🔗 Series or parallel circuit: “own switch for each bulb”? (a) series (b) parallel
28. 28.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) series (b) parallel
29. 29.Which drawing is the symbol for a wire? (a) a straight line (b) a line lifted at a gap (c) a circle with V inside (d) a small empty box
30. 30.Which of these is a conductor? (a) a rubber band (b) a woollen thread (c) a brass key (d) a wooden stick
31. 31.🔋 Does a solar panel give electricity or use electricity? (a) uses electricity (b) gives electricity
32. 32.True or false: “a single current path” is true of a series circuit. (a) False (b) True
33. 33.🔘 Switch A is on the main wire next to the cell and the bulb; then the wire splits into two side-by-side paths, one with switch B and one with switch C. A is OFF, B is ON and C is ON. Does the bulb glow? (a) Yes (b) No
34. 34.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. How many bulbs glow?
35. 35.🔋 6 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
36. 36.Which drawing is the symbol for a capacitor? (a) a circle with M inside (b) many long-short pairs (c) a circle with a cross (d) two equal parallel lines
37. 37.🔍 Which is the odd one out? (a) a doorbell (b) a water heater (c) a school bell (d) a buzzer
38. 38.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. Does bulb 2 glow? (a) Yes (b) No
39. 39.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they keep glowing (b) they all go out (c) they get dimmer (d) they explode
40. 40.Which of these is not safe? (a) stay away from pylons (b) fly kites in open fields (c) keep drinks far away (d) touch a switch when wet

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