Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 360 · 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.🔌 Why are electric wires covered in plastic? (a) plastic is a conductor (b) to make them heavy (c) plastic makes current (d) plastic is an insulator
2. 2.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) capacitor (b) battery (c) LED (d) bulb
3. 3.True or false: “own switch for each bulb” is true of a series circuit. (a) True (b) False
4. 4.What does a reed switch do? (a) works only while pressed (b) slides side to side (c) flips up or down (d) closes near a magnet
5. 5.🔋 3 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
6. 6.What does a push button do? (a) closes near a magnet (b) springs back when let go (c) flips up or down (d) stays where you flip it
7. 7.True or false: “a single current path” is true of a series circuit. (a) False (b) True
8. 8.True or false: a dot where wires meet is the symbol for a junction. (a) True (b) False
9. 9.Which of these is safe? (a) poke things in a socket (b) keep drinks far away (c) touch a fallen wire (d) use mains for a project
10. 10.🔦 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) No (b) Yes
11. 11.🔘 Which kind of switch closes when tipped over? (a) a slide switch (b) a push button (c) a tilt switch (d) a reed switch
12. 12.True or false: to touch a fallen wire is not safe. (a) False (b) True
13. 13.⚡ What do we call a flow of electric charge through a wire? (a) friction (b) sound (c) a magnet (d) electric current
14. 14.Which of these is true of a series circuit? (a) each gets the full volts (b) used in house wiring (c) many paths for current (d) bulbs share the voltage
15. 15.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
16. 16.⚠️ Is it safe to touch a switch when wet? (a) not safe (b) safe
17. 17.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) only one (b) it does not matter (c) both of them (d) none
18. 18.⚡ What does a water heater mainly change electricity into? (a) movement (b) heat (c) sound (d) light
19. 19.Which of these means the circuit is closed? (a) a cell is taken out (b) a wire has come loose (c) the switch is OFF (d) all wires are joined
20. 20.💡 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. Bulbs 4 and 5 are taken out of their holders. How many bulbs glow?
21. 21.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
22. 22.True or false: triangle against a bar is the symbol for a diode. (a) True (b) False
23. 23.✏️ In a circuit diagram, wires are usually drawn as … (a) dotted circles (b) little stars (c) straight lines (d) wavy lines
24. 24.💡 4 identical bulbs are joined in parallel across a 9 V battery (ideal wires). How many volts does each bulb get? =
25. 25.True or false: if a wire is cut, the circuit is closed and current flows. (a) True (b) False
26. 26.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in series (b) by Wi-Fi (c) in parallel (d) not joined
27. 27.🔘 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 ON, B is ON and C is OFF. Does the bulb glow? (a) Yes (b) No
28. 28.💡 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. Bulb 1 is taken out of its holder. How many bulbs glow?
29. 29.🔁 What must there be for a current to flow? (a) a broken path (b) one loose end (c) a complete loop (d) a plastic gap
30. 30.🔍 Which is the odd one out? (a) a siren (b) a room heater (c) a water heater (d) an electric kettle
31. 31.🔗 Series or parallel circuit: “each gets the full volts”? (a) parallel (b) series
32. 32.True or false: a copper wire is a conductor. (a) True (b) False
33. 33.Which of these gives us electricity? (a) a bicycle dynamo (b) a computer (c) a refrigerator (d) an air conditioner
34. 34.🔋 Does a generator give electricity or use electricity? (a) uses electricity (b) gives electricity
35. 35.✏️ In a circuit diagram, which part is drawn as a circle with V inside? (a) motor (b) voltmeter (c) bulb (d) resistor
36. 36.Which of these mainly makes sound? (a) a torch (b) an LED lamp (c) a ceiling fan (d) a school bell
37. 37.Which of these uses electricity? (a) a water pump (b) a generator (c) a bicycle dynamo (d) a battery
38. 38.Which of these is not safe? (a) stay away from pylons (b) fly kites in open fields (c) take cells out after use (d) open a phone charger
39. 39.True or false: a line lifted at a gap is the symbol for a switch. (a) True (b) False
40. 40.⚠️ Is it safe to stay away from pylons? (a) safe (b) not safe

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