Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 807 · 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 is the odd one out? (a) a wooden stick (b) a safety pin (c) a woollen thread (d) a rubber eraser
2. 2.🔗 Series or parallel circuit: “own switch for each bulb”? (a) series (b) parallel
3. 3.🔘 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 ON and C is OFF. Does the bulb glow? (a) Yes (b) No
4. 4.🔘 A bulb and a cell are joined through 4 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
5. 5.Which of these mainly makes movement? (a) an electric toy car (b) an LED lamp (c) a traffic signal (d) a torch
6. 6.True or false: “used in house wiring” is true of a series circuit. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) climb an electric pole (b) poke things in a socket (c) use a cable with cuts (d) build with an adult near
8. 8.⚠️ Is it safe to build with an adult near? (a) not safe (b) safe
9. 9.Which of these is safe? (a) use mains for a project (b) use small battery cells (c) throw cells in a fire (d) use a cable with cuts
10. 10.⚡ What does a ceiling fan mainly change electricity into? (a) sound (b) light (c) heat (d) movement
11. 11.True or false: if a wire has come loose, the circuit is open and no current flows. (a) True (b) False
12. 12.What does a reed switch do? (a) springs back when let go (b) closes when tipped over (c) works only while pressed (d) closes near a magnet
13. 13.🔋 2 identical 3 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
14. 14.🔘 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?
15. 15.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) never (b) only when both are OFF (c) when either is ON (d) only when both are ON
16. 16.🔋 A 9 V battery and one 1.5 V cell are joined in series, all facing the same way. What is the total voltage (in volts)? =
17. 17.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) it does not matter (b) none (c) only one (d) both of them
18. 18.True or false: if all wires are joined, the circuit is open and no current flows. (a) False (b) True
19. 19.Which of these mainly gives out heat? (a) an LED lamp (b) a street light (c) a mixer grinder (d) an electric iron
20. 20.💡 3 identical bulbs are joined in series with a 4.5 V battery (ideal wires). How many volts does each bulb get? =
21. 21.🔋 2 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)? =
22. 22.✏️ In a circuit diagram, which part is drawn as a small empty box? (a) LED (b) battery (c) resistor (d) ammeter
23. 23.🔘 A cell and a bulb are joined to 2 side-by-side paths with one switch on each path — A and B (parallel). A is ON and B is OFF. Does the bulb glow? (a) Yes (b) No
24. 24.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) cell (b) diode (c) motor (d) battery
25. 25.⚠️ About how many volts do home sockets in India supply? (a) 230 V (b) 1.5 V (c) 9 V (d) 12 V
26. 26.Which of these means the circuit is closed? (a) the switch is OFF (b) all wires are joined (c) a wire is cut (d) a wire has come loose
27. 27.Which of these is true of a series circuit? (a) many paths for current (b) a single current path (c) used in house wiring (d) each gets the full volts
28. 28.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a safety pin across the gap. Does the bulb glow? (a) No (b) Yes
29. 29.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the base (b) the switch (c) the filament (d) the glass
30. 30.✏️ In a circuit diagram, wires are usually drawn as … (a) dotted circles (b) wavy lines (c) straight lines (d) little stars
31. 31.🔘 What does a switch do in a circuit? (a) opens or closes the loop (b) changes the voltage (c) makes electricity (d) stores current
32. 32.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they all go out (b) they explode (c) they keep glowing (d) they get dimmer
33. 33.⚡ What does an electric kettle mainly change electricity into? (a) sound (b) light (c) movement (d) heat
34. 34.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) resistor (b) cell (c) ammeter (d) battery
35. 35.⚠️ Is it safe to fly a kite near wires? (a) not safe (b) safe
36. 36.True or false: a brass key is a conductor. (a) True (b) False
37. 37.💡 Why is house wiring done in parallel? (a) to make bulbs dim (b) to save copper only (c) each gets full voltage (d) so all go off together
38. 38.True or false: a circle with M inside is the symbol for a bulb. (a) False (b) True
39. 39.True or false: on a cell, “usually the red wire” means the + (positive) end. (a) True (b) False
40. 40.🔌 Is a cotton thread a conductor or an insulator? (a) an insulator (b) a conductor

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