Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 801 · 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.⚠️ 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
2. 2.💡 Why is house wiring done in parallel? (a) each gets full voltage (b) to make bulbs dim (c) to save copper only (d) so all go off together
3. 3.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a fuse or MCB (b) a plug top (c) a bulb (d) a long wire
4. 4.True or false: a dry cork is a conductor. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) touch a switch when wet (b) take cells out after use (c) use small battery cells (d) keep drinks far away
6. 6.🔘 Two switches are in series. When does the bulb glow? (a) when both are ON (b) when both are OFF (c) never (d) when either is ON
7. 7.True or false: “used in house wiring” is true of a series circuit. (a) False (b) True
8. 8.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they explode (c) they all go out (d) they keep glowing
9. 9.Which of these means the circuit is closed? (a) the switch is OFF (b) a wire is cut (c) a wire has come loose (d) all wires are joined
10. 10.🔋 How many 2 V cells must be joined in series to give 4 V?
11. 11.True or false: two equal parallel lines is the symbol for a capacitor. (a) True (b) False
12. 12.Which of these means the circuit is open? (a) the switch is ON (b) all wires are joined (c) the bulb is unscrewed (d) the loop is complete
13. 13.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) bulb (b) cell (c) wire (d) junction
14. 14.Which drawing is the symbol for a diode? (a) triangle against a bar (b) a circle with V inside (c) a long and a short line (d) a straight line
15. 15.🔦 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 spoon. Does the bulb glow? (a) No (b) Yes
16. 16.🔘 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
17. 17.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
18. 18.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a plastic ruler across the gap. Does the bulb glow? (a) Yes (b) No
19. 19.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) False (b) True
20. 20.🔦 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
21. 21.🔦 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 copper wire. Does the bulb glow? (a) Yes (b) No
22. 22.🔁 Is the circuit closed or open if the switch is OFF? (a) closed (b) open
23. 23.💡 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. Bulbs 1 and 3 are taken out of their holders. How many bulbs glow?
24. 24.True or false: “a single current path” is true of a parallel circuit. (a) False (b) True
25. 25.⚡ What does a doorbell mainly change electricity into? (a) light (b) movement (c) heat (d) sound
26. 26.Which of these gives us electricity? (a) an air conditioner (b) a washing machine (c) a television (d) a cell
27. 27.True or false: a circle with a cross is the symbol for a bulb. (a) False (b) True
28. 28.True or false: “a break stops every bulb” is true of a parallel circuit. (a) True (b) False
29. 29.What does a toggle switch do? (a) springs back when let go (b) closes near a magnet (c) stays where you flip it (d) works only while pressed
30. 30.True or false: “bulbs share the voltage” is true of a series circuit. (a) False (b) True
31. 31.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) False (b) True
32. 32.🔦 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 plastic ruler. Does the bulb glow? (a) Yes (b) No
33. 33.Which of these mainly gives out heat? (a) a school bell (b) a tube light (c) a rice cooker (d) a torch
34. 34.✏️ In a circuit diagram, which part is drawn as many long-short pairs? (a) LED (b) switch (c) battery (d) bulb
35. 35.🔘 Which kind of switch closes when tipped over? (a) a reed switch (b) a slide switch (c) a tilt switch (d) a push button
36. 36.🔋 Does a battery give electricity or use electricity? (a) uses electricity (b) gives electricity
37. 37.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. Does the bulb glow? (a) Yes (b) No
38. 38.🔁 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) none (d) both of them
39. 39.🔋 What is a battery? (a) one single wire (b) two or more cells joined (c) a kind of bulb (d) a switch with a lid
40. 40.🔋 Does a water pump give electricity or use electricity? (a) gives electricity (b) uses electricity

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