Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 901 · 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 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
2. 2.🔘 A cell and a bulb are joined to 3 side-by-side paths with one switch on each path — A, B and C (parallel). A is OFF, B is OFF and C is OFF. Does the bulb glow? (a) Yes (b) No
3. 3.Which of these is true of a series circuit? (a) each gets the full volts (b) own switch for each bulb (c) one out, the rest glow (d) a single current path
4. 4.✏️ In a circuit diagram, wires are usually drawn as … (a) little stars (b) straight lines (c) dotted circles (d) wavy lines
5. 5.Which of these is not safe? (a) keep drinks far away (b) fly kites in open fields (c) throw cells in a fire (d) stay away from pylons
6. 6.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they keep glowing (b) they get dimmer (c) they explode (d) they all go out
7. 7.⚠️ Is it safe to keep drinks far away? (a) not safe (b) safe
8. 8.🔋 Does a washing machine give electricity or use electricity? (a) uses electricity (b) gives electricity
9. 9.True or false: “one out, the rest glow” is true of a series circuit. (a) False (b) True
10. 10.⚠️ Is it safe to use small battery cells? (a) not safe (b) safe
11. 11.✏️ Why do engineers draw circuits with symbols? (a) to make it colourful (b) symbols are heavier (c) quick and clear for all (d) to hide the circuit
12. 12.💡 5 identical bulbs are in parallel and each one takes 1.5 A. What total current (in amperes) comes from the battery? =
13. 13.💡 4 identical bulbs are joined in series with a 4 V battery (ideal wires). How many volts does each bulb get? =
14. 14.🔍 Which is the odd one out? (a) build with an adult near (b) open a phone charger (c) fly a kite near wires (d) poke things in a socket
15. 15.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a fuse or MCB (b) a plug top (c) a long wire (d) a bulb
16. 16.Which of these is safe? (a) throw cells in a fire (b) open a phone charger (c) touch a switch when wet (d) use small battery cells
17. 17.Which drawing is the symbol for a bulb? (a) triangle, bar and arrows (b) two equal parallel lines (c) a circle with a cross (d) many long-short pairs
18. 18.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
19. 19.True or false: an exhaust fan mainly makes movement. (a) False (b) True
20. 20.🔦 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
21. 21.💡 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) the same (c) dimmer
22. 22.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) it does not matter (b) only one (c) both of them (d) none
23. 23.🔍 Which is the odd one out? (a) touch a fallen wire (b) touch a switch when wet (c) fly a kite near wires (d) stay away from pylons
24. 24.What does a toggle switch do? (a) slides side to side (b) stays where you flip it (c) closes near a magnet (d) works only while pressed
25. 25.🔌 Most metals are good … (a) magnets only (b) batteries (c) conductors (d) insulators
26. 26.🔍 Which is the odd one out? (a) a buzzer (b) a toaster (c) a room heater (d) an electric iron
27. 27.True or false: “a break stops every bulb” is true of a parallel circuit. (a) False (b) True
28. 28.True or false: “each gets the full volts” is true of a series circuit. (a) True (b) False
29. 29.Which of these means the circuit is closed? (a) the switch is OFF (b) the bulb is unscrewed (c) a cell is taken out (d) the loop is complete
30. 30.💡 6 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?
31. 31.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a copper wire across the gap. Does the bulb glow? (a) Yes (b) No
32. 32.Which drawing is the symbol for an LED? (a) a line lifted at a gap (b) two or more cell symbols (c) a circle with M inside (d) triangle, bar and arrows
33. 33.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) True (b) False
34. 34.⚡ What does a traffic signal mainly change electricity into? (a) sound (b) heat (c) light (d) movement
35. 35.True or false: if a wire is cut, the circuit is open and no current flows. (a) False (b) True
36. 36.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
37. 37.Which of these is a conductor? (a) a steel spoon (b) a rubber eraser (c) a plastic straw (d) a wooden stick
38. 38.🔦 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 steel coin. Does the bulb glow? (a) No (b) Yes
39. 39.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) parallel (b) series
40. 40.⚡ What does an electric toy car mainly change electricity into? (a) heat (b) light (c) sound (d) movement

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