Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 266 · 40 questions

Remember (Find the topic, use the idea): Find the topic: circuit, safety, formula, component, program, sensor or IoT. Use that lesson’s rule — complete loop, V = I × R, P = V × I, last command wins, true → if part. Safety answers are always: low voltage, dry hands, an adult, never the mains.

1. 1.What does a capacitor do? (a) glows using little power (b) is a resistance knob (c) stores a little charge (d) senses how hot it is
2. 2.True or false: to use a cable with cuts is safe. (a) False (b) True
3. 3.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
4. 4.⏱️ How many milliseconds is a wait of 3.3 seconds?
5. 5.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) own switch for each bulb (c) a single current path (d) a break stops every bulb
6. 6.🔌 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
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
8. 8.✏️ In a circuit diagram, wires are usually drawn as … (a) dotted circles (b) little stars (c) straight lines (d) wavy lines
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
10. 10.🔗 Series or parallel circuit: “each gets the full volts”? (a) series (b) parallel
11. 11.🔺 A 25 V supply is joined across a 500 Ω resistor. What current flows (in milliamperes, mA)?
12. 12.🧭 Which part of a microcontroller board brings power and code? (a) the voltage regulator (b) the USB port (c) the power LED (d) the reset button
13. 13.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a motor (c) a servo motor (d) an LED
14. 14.🔺 A 12 V supply is joined across a 12 Ω resistor. What current flows (in amperes)? =
15. 15.🧮 Three equal 75 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
16. 16.Which drawing is the symbol for a switch? (a) a circle with a cross (b) a circle with an X in it (c) a line lifted at a gap (d) triangle, bar and arrows
17. 17.⚠️ Is it safe to stay away from pylons? (a) not safe (b) safe
18. 18.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a plastic straw across the gap. Does the bulb glow? (a) Yes (b) No
19. 19.🔐 Who should decide which smart devices go in a child’s room? (a) the app’s adverts (b) nobody at all (c) an online stranger (d) a parent or guardian
20. 20.True or false: on a cell, “the longer symbol line” means the + (positive) end. (a) False (b) True
21. 21.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) bigger (c) smaller (d) zero
22. 22.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the process (b) the input (c) the output (d) the battery
23. 23.True or false: if all wires are joined, the circuit is closed and current flows. (a) True (b) False
24. 24.True or false: “a break stops every bulb” is true of a parallel circuit. (a) True (b) False
25. 25.Which of these is an insulator? (a) a metal paper clip (b) a safety pin (c) a woollen thread (d) aluminium foil
26. 26.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) bulb (b) ammeter (c) resistor (d) capacitor
27. 27.🔍 Which is the odd one out? (a) the fan starts (b) an LED lights up (c) a soil moisture reading (d) a buzzer beeps
28. 28.🌈 In the resistor colour code, which number does red stand for?
29. 29.True or false: current is measured in amperes (A). (a) False (b) True
30. 30.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) sound energy (b) movement energy (c) chemical energy (d) light energy
31. 31.True or false: a motor blows if current is high. (a) False (b) True
32. 32.🔋 Does a mobile phone give electricity or use electricity? (a) uses electricity (b) gives electricity
33. 33.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V × I (c) P = V + I (d) P = V ÷ I
34. 34.⚡ Power tells us … (a) the length of a wire (b) the colour of light (c) the size of a cell (d) energy used each second
35. 35.True or false: on a cell, “the flat end” means the + (positive) end. (a) True (b) False
36. 36.🔢 To get a sensor reading onto a phone, what comes right after “the board reads it”? (a) it is sent by Wi-Fi (b) the app shows it (c) the cloud stores it (d) the sensor measures
37. 37.🔦 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
38. 38.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
39. 39.Which of these is a good habit? (a) ignore update messages (b) post your live location (c) set a strong password (d) accept every permission
40. 40.⏱️ A program says “wait 6250 ms”. How many seconds is that? =

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