Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 115 · 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 tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a metal paper clip across the gap. Does the bulb glow? (a) No (b) Yes
2. 2.🔦 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
3. 3.🔋 What should you do with used-up cells? (a) throw them in a fire (b) give them for recycling (c) bury them in soil (d) cut them open
4. 4.⚡ What does a room heater mainly change electricity into? (a) movement (b) light (c) heat (d) sound
5. 5.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) a break stops every bulb (c) each gets the full volts (d) bulbs share the voltage
6. 6.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) closed (b) open
7. 7.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) the loop is complete (c) the switch is OFF (d) a wire is cut
8. 8.True or false: on a cell, “the flat end” means the + (positive) end. (a) False (b) True
9. 9.Which of these gives us electricity? (a) a cell (b) a computer (c) a washing machine (d) an air conditioner
10. 10.Which of these is true of a series circuit? (a) each gets the full volts (b) one out, the rest glow (c) own switch for each bulb (d) a single current path
11. 11.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in parallel (b) not joined (c) in series (d) by Wi-Fi
12. 12.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 3 is taken out of its holder. Does bulb 1 glow? (a) Yes (b) No
13. 13.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
14. 14.🔌 A gap of dry air between two wires acts as … (a) a conductor (b) a cell (c) a switch that is ON (d) an insulator
15. 15.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) to make it colourful (c) quick and clear for all (d) to hide the circuit
16. 16.True or false: to touch a switch when wet is not safe. (a) False (b) True
17. 17.✏️ In a circuit diagram, wires are usually drawn as … (a) dotted circles (b) little stars (c) straight lines (d) wavy lines
18. 18.Which of these is not safe? (a) take cells out after use (b) fly kites in open fields (c) use mains for a project (d) keep drinks far away
19. 19.Which of these mainly gives out light? (a) a street light (b) a buzzer (c) a mixer grinder (d) a water heater
20. 20.True or false: two or more cell symbols is the symbol for a diode. (a) False (b) True
21. 21.Which of these is a conductor? (a) a dry cork (b) a ceramic cup (c) a glass marble (d) a copper wire
22. 22.🔍 Which is the odd one out? (a) dry your hands first (b) use small battery cells (c) poke things in a socket (d) stop if a part gets hot
23. 23.🔌 Why are electric wires covered in plastic? (a) to make them heavy (b) plastic makes current (c) plastic is a conductor (d) plastic is an insulator
24. 24.🔋 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)? =
25. 25.Which of these mainly makes movement? (a) an LED lamp (b) a table fan (c) a water heater (d) an electric kettle
26. 26.True or false: to touch a fallen wire is not safe. (a) False (b) True
27. 27.True or false: if a cell is taken out, the circuit is open and no current flows. (a) True (b) False
28. 28.🔌 Is a cotton thread a conductor or an insulator? (a) an insulator (b) a conductor
29. 29.True or false: a tube light mainly gives out light. (a) True (b) False
30. 30.Which of these mainly gives out heat? (a) a street light (b) a rice cooker (c) a school bell (d) a tube light
31. 31.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) one bulb out, all go out (c) a single current path (d) used in house wiring
32. 32.🔘 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 OFF and C is ON. Does the bulb glow? (a) No (b) Yes
33. 33.🔋 What is a battery? (a) one single wire (b) two or more cells joined (c) a switch with a lid (d) a kind of bulb
34. 34.💡 3 identical bulbs are joined in series with a 4.5 V battery (ideal wires). How many volts does each bulb get? =
35. 35.💡 2 identical bulbs are in parallel and each one takes 0.2 A. What total current (in amperes) comes from the battery? =
36. 36.🔘 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
37. 37.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
38. 38.✏️ In a circuit diagram, which part is drawn as a straight line? (a) wire (b) cell (c) ammeter (d) motor
39. 39.🔍 Which is the odd one out? (a) a night lamp (b) a torch (c) a traffic signal (d) an electric toy car
40. 40.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) bulbs share the voltage (c) many paths for current (d) one bulb out, all go out

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