Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 791 · 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.🔦 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) No (b) Yes
2. 2.Which drawing is the symbol for a voltmeter? (a) a small empty box (b) one tall, one short bar (c) a circle with V inside (d) a plain rectangle
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 OFF, C is ON and D is OFF. Does the bulb glow? (a) No (b) Yes
4. 4.🔘 Two switches are in series. When does the bulb glow? (a) when both are OFF (b) never (c) when either is ON (d) when both are ON
5. 5.⚡ Which tiny particles drift along a metal wire to carry the current? (a) photons (b) electrons (c) water drops (d) dust particles
6. 6.True or false: on a cell, “the longer symbol line” means the + (positive) end. (a) False (b) True
7. 7.💡 4 identical bulbs are joined in parallel across a 6 V battery (ideal wires). How many volts does each bulb get? =
8. 8.True or false: a plastic ruler is a conductor. (a) True (b) False
9. 9.True or false: a brass key is a conductor. (a) False (b) True
10. 10.True or false: on a cell, “usually the red wire” means the + (positive) end. (a) True (b) False
11. 11.🔋 How many 1.2 V cells must be joined in series to give 4.8 V?
12. 12.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they all go out (b) they get dimmer (c) they keep glowing (d) they explode
13. 13.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
14. 14.🔦 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 woollen thread. Does the bulb glow? (a) Yes (b) No
15. 15.Which of these is a conductor? (a) a copper wire (b) a rubber band (c) a rubber eraser (d) a wooden stick
16. 16.What does a slide switch do? (a) springs back when let go (b) closes when tipped over (c) works only while pressed (d) slides side to side
17. 17.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
18. 18.⚠️ Which power source should children use for electronics projects? (a) a mains extension board (b) a wall socket (c) an inverter socket (d) a small battery pack
19. 19.Which drawing is the symbol for a capacitor? (a) a circle with V inside (b) two equal parallel lines (c) a small empty box (d) a circle with M inside
20. 20.🔋 What should you do with used-up cells? (a) cut them open (b) throw them in a fire (c) give them for recycling (d) bury them in soil
21. 21.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) series (b) parallel
22. 22.🔘 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) Yes (b) No
23. 23.Which of these is safe? (a) open a phone charger (b) touch a fallen wire (c) dry your hands first (d) touch a switch when wet
24. 24.True or false: a plastic straw is an insulator. (a) False (b) True
25. 25.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. Does bulb 1 glow? (a) Yes (b) No
26. 26.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) True (b) False
27. 27.Which drawing is the symbol for a resistor? (a) a circle with a cross (b) a circle with V inside (c) a long and a short line (d) a plain rectangle
28. 28.🔍 Which is the odd one out? (a) a plastic ruler (b) a dry cork (c) a plastic straw (d) aluminium foil
29. 29.🔁 Is the circuit closed or open if all wires are joined? (a) open (b) closed
30. 30.True or false: if the switch is OFF, the circuit is open and no current flows. (a) False (b) True
31. 31.🔘 A cell and a bulb are joined to 4 side-by-side paths with one switch on each path — A, B, C and D (parallel). A is ON, B is OFF, C is OFF and D is ON. Does the bulb glow? (a) Yes (b) No
32. 32.🔋 3 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)? =
33. 33.🔘 A cell and a bulb are joined to 4 side-by-side paths with one switch on each path — A, B, C and D (parallel). A is ON, B is ON, C is ON and D is ON. Does the bulb glow? (a) Yes (b) No
34. 34.True or false: a table fan mainly gives out heat. (a) True (b) False
35. 35.Which of these is true of a parallel circuit? (a) a single current path (b) a break stops every bulb (c) one out, the rest glow (d) one bulb out, all go out
36. 36.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
37. 37.Which of these is safe? (a) climb an electric pole (b) open a phone charger (c) touch a switch when wet (d) stay away from pylons
38. 38.Which of these means the circuit is open? (a) a cell is taken out (b) the loop is complete (c) the switch is ON (d) all wires are joined
39. 39.💡 3 identical bulbs are joined in parallel across a 12 V battery (ideal wires). How many volts does each bulb get? =
40. 40.🔘 When a switch is ON, the circuit is … (a) open (b) cut (c) closed (d) broken

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