Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 786 · 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.🔋 5 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)? =
2. 2.True or false: “one out, the rest glow” is true of a series circuit. (a) True (b) False
3. 3.True or false: “each gets the full volts” is true of a parallel circuit. (a) True (b) False
4. 4.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) many paths for current (c) bulbs share the voltage (d) a break stops every bulb
5. 5.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) True (b) False
6. 6.⚠️ Why must we never touch switches with wet hands? (a) water carries current (b) water makes it cold (c) it is just untidy (d) it spoils the paint
7. 7.Which of these is an insulator? (a) a steel spoon (b) a copper wire (c) a wooden stick (d) an iron nail
8. 8.🔋 8 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
9. 9.💡 5 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. Bulb 5 is taken out of its holder. Does bulb 2 glow? (a) Yes (b) No
10. 10.⚠️ Is it safe to throw cells in a fire? (a) not safe (b) safe
11. 11.🔦 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 brass key. Does the bulb glow? (a) Yes (b) No
12. 12.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. How many bulbs glow?
13. 13.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
14. 14.💡 5 identical bulbs are joined in series with a 12.5 V battery (ideal wires). How many volts does each bulb get? =
15. 15.⚠️ Is it safe to use small battery cells? (a) safe (b) not safe
16. 16.⚡ A fan changes electrical energy mainly into which kind of energy? (a) chemical energy (b) sound energy (c) movement energy (d) light energy
17. 17.Which of these gives us electricity? (a) an air conditioner (b) a computer (c) a water pump (d) a cell
18. 18.🔌 Which part of a screwdriver should an electrician hold? (a) the plastic handle (b) the metal tip (c) the bare end (d) the steel shaft
19. 19.True or false: “a break stops every bulb” is true of a parallel circuit. (a) False (b) True
20. 20.Which of these mainly gives out light? (a) a toaster (b) a school bell (c) a rice cooker (d) an LED lamp
21. 21.True or false: a paper strip is a conductor. (a) False (b) True
22. 22.Which of these is not safe? (a) build with an adult near (b) poke things in a socket (c) stop if a part gets hot (d) take cells out after use
23. 23.What does a toggle switch do? (a) works only while pressed (b) flips up or down (c) closes near a magnet (d) closes when tipped over
24. 24.Which of these uses electricity? (a) a battery (b) a cell (c) a mobile phone (d) a generator
25. 25.Which drawing is the symbol for a diode? (a) triangle against a bar (b) a circle with M inside (c) a line lifted at a gap (d) one tall, one short bar
26. 26.🔍 Which is the odd one out? (a) a buzzer (b) a doorbell (c) a loudspeaker (d) a room heater
27. 27.Which of these mainly gives out light? (a) an electric toy car (b) a toaster (c) a traffic signal (d) a table fan
28. 28.Which drawing is the symbol for a resistor? (a) a circle with A inside (b) a plain rectangle (c) a circle with a cross (d) two or more cell symbols
29. 29.🔘 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 OFF, B is ON and C is ON. Does the bulb glow? (a) No (b) Yes
30. 30.⚡ What does a doorbell mainly change electricity into? (a) movement (b) sound (c) light (d) heat
31. 31.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a steel coin across the gap. Does the bulb glow? (a) Yes (b) No
32. 32.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they explode (c) they keep glowing (d) they all go out
33. 33.True or false: a dry cork is a conductor. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) a brass key (b) a paper strip (c) a rubber eraser (d) a wooden stick
35. 35.Which of these means the circuit is closed? (a) all wires are joined (b) a cell is taken out (c) a wire has come loose (d) the bulb is unscrewed
36. 36.True or false: to stop if a part gets hot is safe. (a) False (b) True
37. 37.Which of these is safe? (a) use small battery cells (b) throw cells in a fire (c) touch a fallen wire (d) climb an electric pole
38. 38.🔌 Why are electric wires covered in plastic? (a) to make them heavy (b) plastic is an insulator (c) plastic is a conductor (d) plastic makes current
39. 39.⚠️ 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
40. 40.🔋 A 6 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =

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