Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 179 · 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 bulbs are in parallel and each one takes 1.5 A. What total current (in amperes) comes from the battery? =
2. 2.💡 4 identical bulbs are joined in series with an 8 V battery (ideal wires). How many volts does each bulb get? =
3. 3.Which of these means the circuit is open? (a) a wire is cut (b) the loop is complete (c) the switch is ON (d) all wires are joined
4. 4.🔦 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 ceramic cup. Does the bulb glow? (a) Yes (b) No
5. 5.🔗 Series or parallel circuit: “own switch for each bulb”? (a) parallel (b) series
6. 6.🔍 Which is the odd one out? (a) a cotton thread (b) a brass key (c) an iron nail (d) a copper wire
7. 7.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
8. 8.⚠️ Is it safe to keep drinks far away? (a) not safe (b) safe
9. 9.🔘 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) No (b) Yes
10. 10.🔋 How many volts does one ordinary torch cell give? (a) 0.5 V (b) 230 V (c) 15 V (d) 1.5 V
11. 11.What does a push button do? (a) closes near a magnet (b) works only while pressed (c) stays where you flip it (d) slides side to side
12. 12.💡 6 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
13. 13.⚡ What does a mixer grinder mainly change electricity into? (a) movement (b) sound (c) heat (d) light
14. 14.⚡ What does a loudspeaker mainly change electricity into? (a) heat (b) light (c) sound (d) movement
15. 15.🔋 Does a television give electricity or use electricity? (a) gives electricity (b) uses electricity
16. 16.Which drawing is the symbol for a voltmeter? (a) a straight line (b) triangle against a bar (c) a circle with V inside (d) a circle with M inside
17. 17.Which drawing is the symbol for an LED? (a) a circle with V inside (b) two or more cell symbols (c) a long and a short line (d) triangle, bar and arrows
18. 18.Which of these is not safe? (a) take cells out after use (b) stop if a part gets hot (c) use small battery cells (d) touch a switch when wet
19. 19.True or false: a push button flips up or down. (a) False (b) True
20. 20.💡 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?
21. 21.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) series (b) parallel
22. 22.✏️ Why do engineers draw circuits with symbols? (a) quick and clear for all (b) to hide the circuit (c) to make it colourful (d) symbols are heavier
23. 23.🔁 Is the circuit closed or open if all wires are joined? (a) closed (b) open
24. 24.True or false: a reed switch closes near a magnet. (a) False (b) True
25. 25.🔌 Is aluminium foil a conductor or an insulator? (a) a conductor (b) an insulator
26. 26.Which of these is true of a series circuit? (a) used in house wiring (b) bulbs share the voltage (c) one out, the rest glow (d) many paths for current
27. 27.✏️ In a circuit diagram, which part is drawn as a straight line? (a) diode (b) capacitor (c) voltmeter (d) wire
28. 28.✏️ In a circuit diagram, which part is drawn as triangle against a bar? (a) diode (b) resistor (c) motor (d) LED
29. 29.True or false: “each gets the full volts” is true of a series circuit. (a) False (b) True
30. 30.Which of these is an insulator? (a) a brass key (b) a safety pin (c) a metal paper clip (d) a rubber eraser
31. 31.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) + (positive) (b) − (negative)
32. 32.⚡ A cell changes stored chemical energy into which kind of energy? (a) nuclear energy (b) electrical energy (c) sound energy (d) wind energy
33. 33.💡 Why is house wiring done in parallel? (a) to make bulbs dim (b) to save copper only (c) so all go off together (d) each gets full voltage
34. 34.🔗 Series or parallel circuit: “many paths for current”? (a) parallel (b) series
35. 35.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) bulb (b) resistor (c) switch (d) voltmeter
36. 36.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
37. 37.⚡ Which tiny particles drift along a metal wire to carry the current? (a) photons (b) electrons (c) dust particles (d) water drops
38. 38.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 4 is taken out of its holder. How many bulbs glow?
39. 39.🔘 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 OFF. Does the bulb glow? (a) No (b) Yes
40. 40.🔌 A gap of dry air between two wires acts as … (a) an insulator (b) a cell (c) a switch that is ON (d) a conductor

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