Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 763 · 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.🔋 What should you do with used-up cells? (a) throw them in a fire (b) give them for recycling (c) cut them open (d) bury them in soil
2. 2.🔋 2 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
3. 3.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is OFF, B is ON, C is ON and D is OFF. Does the bulb glow? (a) No (b) Yes
4. 4.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) False (b) True
5. 5.🔁 Is the circuit closed or open if a cell is taken out? (a) closed (b) open
6. 6.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) closed (b) open
7. 7.True or false: a toggle switch flips up or down. (a) False (b) True
8. 8.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the glass (b) the base (c) the switch (d) the filament
9. 9.⚠️ Why must we never touch switches with wet hands? (a) it spoils the paint (b) water makes it cold (c) water carries current (d) it is just untidy
10. 10.True or false: to throw cells in a fire is safe. (a) True (b) False
11. 11.💡 4 identical bulbs are joined in parallel across a 4.5 V battery (ideal wires). How many volts does each bulb get? =
12. 12.Which of these is an insulator? (a) a graphite rod (b) a brass key (c) aluminium foil (d) a plastic straw
13. 13.🔦 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) Yes (b) No
14. 14.True or false: to climb an electric pole is not safe. (a) True (b) False
15. 15.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
16. 16.True or false: “own switch for each bulb” is true of a parallel circuit. (a) True (b) False
17. 17.True or false: “a single current path” is true of a parallel circuit. (a) True (b) False
18. 18.True or false: “many paths for current” is true of a parallel circuit. (a) False (b) True
19. 19.🔘 Which kind of switch springs back when let go? (a) a reed switch (b) a tilt switch (c) a push button (d) a toggle switch
20. 20.True or false: a toaster mainly makes sound. (a) False (b) True
21. 21.💡 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 4 are taken out of their holders. Does bulb 2 glow? (a) Yes (b) No
22. 22.🔌 A gap of dry air between two wires acts as … (a) a conductor (b) an insulator (c) a cell (d) a switch that is ON
23. 23.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a graphite rod across the gap. Does the bulb glow? (a) No (b) Yes
24. 24.What does a tilt switch do? (a) closes near a magnet (b) slides side to side (c) closes when tipped over (d) springs back when let go
25. 25.💡 Why is house wiring done in parallel? (a) so all go off together (b) each gets full voltage (c) to make bulbs dim (d) to save copper only
26. 26.🔗 Series or parallel circuit: “a break stops every bulb”? (a) parallel (b) series
27. 27.🔘 Which kind of switch works only while pressed? (a) a slide switch (b) a reed switch (c) a tilt switch (d) a push button
28. 28.Which of these gives us electricity? (a) a wind turbine (b) an air conditioner (c) a computer (d) a washing machine
29. 29.True or false: many long-short pairs is the symbol for a battery. (a) False (b) True
30. 30.True or false: on a cell, “the flat end” means the − (negative) end. (a) True (b) False
31. 31.💡 5 identical bulbs are joined in series with a 7.5 V battery (ideal wires). How many volts does each bulb get? =
32. 32.Which of these is not safe? (a) stop if a part gets hot (b) build with an adult near (c) touch a fallen wire (d) fly kites in open fields
33. 33.💡 A battery lights 5 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) dimmer (c) brighter
34. 34.Which of these is true of a parallel circuit? (a) used in house wiring (b) bulbs share the voltage (c) a break stops every bulb (d) one bulb out, all go out
35. 35.⚠️ Is it safe to dry your hands first? (a) not safe (b) safe
36. 36.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) junction (b) resistor (c) bulb (d) motor
37. 37.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a fuse or MCB (b) a long wire (c) a plug top (d) a bulb
38. 38.Which of these means the circuit is closed? (a) all wires are joined (b) the bulb is unscrewed (c) the switch is OFF (d) a cell is taken out
39. 39.🔋 3 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
40. 40.True or false: triangle against a bar is the symbol for a cell. (a) True (b) False

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