Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 717 · 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.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 5 of the switches are OFF and the rest are ON. How many bulbs glow?
2. 2.⚠️ Is it safe to fly kites in open fields? (a) safe (b) not safe
3. 3.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) neither line (c) the longer line (d) both lines
4. 4.🔍 Which is the odd one out? (a) fly kites in open fields (b) fly a kite near wires (c) build with an adult near (d) stop if a part gets hot
5. 5.💡 2 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 2 are taken out of their holders. How many bulbs glow?
6. 6.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is ON, B is ON, C is ON and D is ON. Does the bulb glow? (a) No (b) Yes
7. 7.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
8. 8.🔘 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 OFF. Does the bulb glow? (a) No (b) Yes
9. 9.True or false: a push button works only while pressed. (a) True (b) False
10. 10.🔦 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 woollen thread. Does the bulb glow? (a) No (b) Yes
11. 11.⚠️ Is it safe to build with an adult near? (a) not safe (b) safe
12. 12.Which drawing is the symbol for a resistor? (a) a plain rectangle (b) a circle with an X in it (c) many long-short pairs (d) a circle with A inside
13. 13.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
14. 14.Which of these is safe? (a) take cells out after use (b) touch a fallen wire (c) open a phone charger (d) fly a kite near wires
15. 15.True or false: on a cell, “the shorter symbol line” means the + (positive) end. (a) True (b) False
16. 16.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 1 glow? (a) No (b) Yes
17. 17.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they keep glowing (b) they get dimmer (c) they all go out (d) they explode
18. 18.True or false: two equal parallel lines is the symbol for a diode. (a) False (b) True
19. 19.🔋 7 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
20. 20.Which of these uses electricity? (a) a bicycle dynamo (b) a water pump (c) a power station (d) a battery
21. 21.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) a break stops every bulb (c) many paths for current (d) a single current path
22. 22.✏️ In a circuit diagram, which part is drawn as a straight line? (a) bulb (b) LED (c) wire (d) battery
23. 23.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
24. 24.Which drawing is the symbol for an ammeter? (a) a circle with A inside (b) a long and a short line (c) triangle, bar and arrows (d) a small empty box
25. 25.True or false: to open a phone charger is safe. (a) True (b) False
26. 26.True or false: an exhaust fan mainly gives out light. (a) False (b) True
27. 27.🔌 Why are electric wires covered in plastic? (a) to make them heavy (b) plastic is a conductor (c) plastic is an insulator (d) plastic makes current
28. 28.True or false: if a cell is taken out, the circuit is open and no current flows. (a) False (b) True
29. 29.💡 2 identical bulbs are joined in parallel across a 3 V battery (ideal wires). How many volts does each bulb get? =
30. 30.💡 In a series circuit, how many paths does the current have? (a) none (b) one (c) one for each bulb (d) two
31. 31.Which of these is a conductor? (a) a plastic straw (b) a paper strip (c) a steel spoon (d) a wooden stick
32. 32.True or false: a paper strip is an insulator. (a) False (b) True
33. 33.Which of these mainly makes movement? (a) a torch (b) a table fan (c) a buzzer (d) a room heater
34. 34.🔍 Which is the odd one out? (a) stay away from pylons (b) dry your hands first (c) take cells out after use (d) touch a switch when wet
35. 35.True or false: a circle with V inside is the symbol for a voltmeter. (a) False (b) True
36. 36.Which of these is not safe? (a) use small battery cells (b) use mains for a project (c) take cells out after use (d) keep drinks far away
37. 37.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
38. 38.🔋 4 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
39. 39.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) + (positive) (b) − (negative)
40. 40.💡 A battery lights 3 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter

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