Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 821 · 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.💡 6 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. Bulbs 1 and 2 are taken out of their holders. Does bulb 3 glow? (a) No (b) Yes
2. 2.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
3. 3.Which of these is a conductor? (a) a safety pin (b) a plastic ruler (c) a woollen thread (d) a wooden stick
4. 4.🔋 3 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
5. 5.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) closed (b) open
6. 6.🔍 Which is the odd one out? (a) use a cable with cuts (b) use mains for a project (c) keep drinks far away (d) poke things in a socket
7. 7.🔋 5 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)? =
8. 8.🔗 Series or parallel circuit: “used in house wiring”? (a) parallel (b) series
9. 9.🔦 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 ceramic cup. Does the bulb glow? (a) Yes (b) No
10. 10.True or false: on a cell, “the shorter symbol line” means the + (positive) end. (a) True (b) False
11. 11.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is ON, B is OFF and C is OFF. Does the bulb glow? (a) Yes (b) No
12. 12.True or false: if the bulb is unscrewed, the circuit is closed and current flows. (a) False (b) True
13. 13.True or false: if the loop is complete, the circuit is open and no current flows. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) climb an electric pole (b) dry your hands first (c) touch a switch when wet (d) fly a kite near wires
15. 15.🔋 What is a battery? (a) a switch with a lid (b) a kind of bulb (c) one single wire (d) two or more cells joined
16. 16.Which of these is not safe? (a) stop if a part gets hot (b) dry your hands first (c) keep drinks far away (d) use a cable with cuts
17. 17.Which of these mainly gives out light? (a) a toaster (b) a traffic signal (c) a loudspeaker (d) a room heater
18. 18.True or false: if a wire is cut, the circuit is closed and current flows. (a) False (b) True
19. 19.🔁 Is the circuit closed or open if a wire has come loose? (a) open (b) closed
20. 20.⚠️ About how many volts do home sockets in India supply? (a) 230 V (b) 12 V (c) 9 V (d) 1.5 V
21. 21.Which of these is an insulator? (a) a metal paper clip (b) a woollen thread (c) a steel coin (d) a safety pin
22. 22.True or false: if the switch is OFF, the circuit is closed and current flows. (a) True (b) False
23. 23.🔘 A bulb and a cell are joined through 3 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
24. 24.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) two (c) none (d) one
25. 25.⚠️ Is it safe to use a cable with cuts? (a) safe (b) not safe
26. 26.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) True (b) False
27. 27.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the base (b) the glass (c) the switch (d) the filament
28. 28.⚠️ Why must we never touch switches with wet hands? (a) it spoils the paint (b) water carries current (c) it is just untidy (d) water makes it cold
29. 29.🔍 Which is the odd one out? (a) use small battery cells (b) take cells out after use (c) keep drinks far away (d) use mains for a project
30. 30.⚠️ Is it safe to dry your hands first? (a) safe (b) not safe
31. 31.🔘 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 ON. Does the bulb glow? (a) Yes (b) No
32. 32.True or false: a plastic ruler is a conductor. (a) True (b) False
33. 33.What does a toggle switch do? (a) closes near a magnet (b) stays where you flip it (c) springs back when let go (d) slides side to side
34. 34.True or false: “one bulb out, all go out” is true of a series circuit. (a) True (b) False
35. 35.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) a ceramic cup (b) a copper wire (c) a glass marble (d) a plastic ruler
37. 37.True or false: “one out, the rest glow” is true of a parallel circuit. (a) True (b) False
38. 38.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) neither line (c) both lines (d) the longer line
39. 39.True or false: to keep drinks far away is not safe. (a) True (b) False
40. 40.🔋 How many 2 V cells must be joined in series to give 6 V?

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