Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 348 · 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.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a steel spoon across the gap. Does the bulb glow? (a) Yes (b) No
2. 2.🔋 5 identical 1.5 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
3. 3.💡 3 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?
4. 4.⚡ What do we call a flow of electric charge through a wire? (a) a magnet (b) friction (c) sound (d) electric current
5. 5.💡 4 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 3 is taken out of its holder. Does bulb 4 glow? (a) No (b) Yes
6. 6.🔌 Is a copper wire a conductor or an insulator? (a) an insulator (b) a conductor
7. 7.🔋 3 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
8. 8.⚠️ Is it safe to use mains for a project? (a) not safe (b) safe
9. 9.Which of these is not safe? (a) keep drinks far away (b) touch a switch when wet (c) stay away from pylons (d) build with an adult near
10. 10.True or false: if a wire has come loose, the circuit is open and no current flows. (a) False (b) True
11. 11.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) bulb (b) motor (c) voltmeter (d) cell
12. 12.True or false: on a cell, “the shorter symbol line” means the − (negative) end. (a) False (b) True
13. 13.What does a tilt switch do? (a) springs back when let go (b) works only while pressed (c) stays where you flip it (d) closes when tipped over
14. 14.Which of these mainly makes movement? (a) a ceiling fan (b) a torch (c) a room heater (d) an electric iron
15. 15.Which of these is true of a series circuit? (a) one out, the rest glow (b) many paths for current (c) each gets the full volts (d) a break stops every bulb
16. 16.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a rubber band across the gap. Does the bulb glow? (a) No (b) Yes
17. 17.True or false: “each gets the full volts” is true of a series circuit. (a) False (b) True
18. 18.🔗 Series or parallel circuit: “a break stops every bulb”? (a) parallel (b) series
19. 19.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) many paths for current (c) one bulb out, all go out (d) bulbs share the voltage
20. 20.⚠️ Which power source should children use for electronics projects? (a) a wall socket (b) a mains extension board (c) an inverter socket (d) a small battery pack
21. 21.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) battery (b) voltmeter (c) bulb (d) motor
22. 22.🔦 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
23. 23.🔦 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) No (b) Yes
24. 24.🔁 Is the circuit closed or open if a wire is cut? (a) closed (b) open
25. 25.Which of these mainly gives out light? (a) a doorbell (b) an electric iron (c) a water heater (d) a torch
26. 26.💡 5 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?
27. 27.Which drawing is the symbol for an LED? (a) many long-short pairs (b) a small empty box (c) two or more cell symbols (d) triangle, bar and arrows
28. 28.✏️ In a circuit diagram, wires are usually drawn as … (a) wavy lines (b) straight lines (c) dotted circles (d) little stars
29. 29.True or false: “own switch for each bulb” is true of a parallel circuit. (a) True (b) False
30. 30.💡 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
31. 31.🔋 Does a refrigerator give electricity or use electricity? (a) uses electricity (b) gives electricity
32. 32.🔋 What is a battery? (a) one single wire (b) a switch with a lid (c) two or more cells joined (d) a kind of bulb
33. 33.🔌 Is a cotton thread a conductor or an insulator? (a) a conductor (b) an insulator
34. 34.🔘 A bulb and a cell are joined through 2 switches on 2 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?
35. 35.🔍 Which is the odd one out? (a) an iron nail (b) a steel spoon (c) aluminium foil (d) a rubber band
36. 36.🔘 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 OFF and C is OFF. Does the bulb glow? (a) Yes (b) No
37. 37.Which drawing is the symbol for a switch? (a) a line lifted at a gap (b) a small empty box (c) a plain rectangle (d) a dot where wires meet
38. 38.🔋 4 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
39. 39.⚠️ Is it safe to build with an adult near? (a) safe (b) not safe
40. 40.True or false: a circle with a cross is the symbol for a motor. (a) False (b) True

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