Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 312 · 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.🔌 Which part of a screwdriver should an electrician hold? (a) the metal tip (b) the bare end (c) the steel shaft (d) the plastic handle
2. 2.True or false: to stop if a part gets hot is not safe. (a) True (b) False
3. 3.True or false: a straight line is the symbol for a cell. (a) False (b) True
4. 4.💡 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
5. 5.🔦 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 a ceramic cup. Does the bulb glow? (a) Yes (b) No
6. 6.True or false: a loudspeaker mainly gives out light. (a) True (b) False
7. 7.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a bulb (b) a fuse or MCB (c) a long wire (d) a plug top
8. 8.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) LED (b) ammeter (c) junction (d) bulb
9. 9.💡 3 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 1 is taken out of its holder. How many bulbs glow?
10. 10.🔘 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
11. 11.🔘 Which kind of switch works only while pressed? (a) a push button (b) a reed switch (c) a toggle switch (d) a slide switch
12. 12.✏️ In a circuit diagram, which part is drawn as triangle against a bar? (a) diode (b) switch (c) LED (d) cell
13. 13.🔋 5 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)? =
14. 14.True or false: a brass key is a conductor. (a) True (b) False
15. 15.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) False (b) True
16. 16.🔋 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)? =
17. 17.🔘 A cell, a bulb and switches A, B and C are joined one after another in a single loop (series). A is ON, B is ON and C is OFF. Does the bulb glow? (a) Yes (b) No
18. 18.Which of these is true of a parallel circuit? (a) a single current path (b) bulbs share the voltage (c) one bulb out, all go out (d) many paths for current
19. 19.💡 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 1 is taken out of its holder. How many bulbs glow?
20. 20.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is OFF and B is OFF. Does the bulb glow? (a) No (b) Yes
21. 21.Which drawing is the symbol for a diode? (a) a line lifted at a gap (b) a circle with a cross (c) triangle, bar and arrows (d) triangle against a bar
22. 22.🔋 Does a generator give electricity or use electricity? (a) uses electricity (b) gives electricity
23. 23.✏️ In a circuit diagram, which part is drawn as a circle with V inside? (a) voltmeter (b) battery (c) cell (d) switch
24. 24.🔌 Why are electric wires covered in plastic? (a) plastic is an insulator (b) plastic makes current (c) to make them heavy (d) plastic is a conductor
25. 25.💡 2 identical bulbs are joined in series with a 2 V battery (ideal wires). How many volts does each bulb get? =
26. 26.🔗 Series or parallel circuit: “a break stops every bulb”? (a) series (b) parallel
27. 27.True or false: if the loop is complete, the circuit is closed and current flows. (a) True (b) False
28. 28.Which of these is true of a parallel circuit? (a) used in house wiring (b) one bulb out, all go out (c) a break stops every bulb (d) a single current path
29. 29.⚠️ Is it safe to take cells out after use? (a) not safe (b) safe
30. 30.💡 3 identical bulbs are in parallel and each one takes 0.2 A. What total current (in amperes) comes from the battery? =
31. 31.✏️ In a circuit diagram, wires are usually drawn as … (a) dotted circles (b) wavy lines (c) little stars (d) straight lines
32. 32.⚠️ About how many volts do home sockets in India supply? (a) 1.5 V (b) 9 V (c) 12 V (d) 230 V
33. 33.🔍 Which is the odd one out? (a) fly a kite near wires (b) take cells out after use (c) dry your hands first (d) keep drinks far away
34. 34.🔁 Is the circuit closed or open if a wire has come loose? (a) open (b) closed
35. 35.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) True (b) False
36. 36.🔦 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
37. 37.🔘 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 ON, B is OFF and C is OFF. Does the bulb glow? (a) Yes (b) No
38. 38.What does a slide switch do? (a) flips up or down (b) slides side to side (c) closes when tipped over (d) stays where you flip it
39. 39.True or false: to stop if a part gets hot is safe. (a) True (b) False
40. 40.True or false: if all wires are joined, the circuit is closed and current flows. (a) False (b) True

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