Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 692 · 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.🌐 In an IoT system, which part acts on a command? (a) Wi-Fi (b) actuator (c) microcontroller (d) cloud server
2. 2.True or false: a toggle switch slides side to side. (a) False (b) True
3. 3.🔐 Privacy for a smart device means controlling … (a) how loud it beeps (b) its colour (c) who can see your data (d) its battery size
4. 4.💡 3 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 2 and 3 are taken out of their holders. How many bulbs glow?
5. 5.🔐 Is it a good or a risky habit to share camera links? (a) good habit (b) risky habit
6. 6.🌐 In an IoT system, which part measures the real world? (a) actuator (b) microcontroller (c) sensor (d) Wi-Fi
7. 7.🔢 To plan an electronics project, which is the FIRST step? (a) list inputs and outputs (b) pick a problem to solve (c) draw the circuit diagram (d) test it and fix it
8. 8.🌈 In the resistor colour code, which number does green stand for?
9. 9.🔺 In the V-I-R triangle, how do we find I? (a) I = R ÷ V (b) I = V + R (c) I = V ÷ R (d) I = V × R
10. 10.What does a push button do? (a) stays where you flip it (b) closes when tipped over (c) closes near a magnet (d) springs back when let go
11. 11.True or false: a laptop has no screen of its own. (a) True (b) False
12. 12.🤖 Microcontroller or laptop: which one runs many apps at once? (a) microcontroller (b) laptop
13. 13.🔺 A current of 0.25 A flows when 5 V is joined across a resistor. What is its resistance (in ohms)?
14. 14.🔋 2 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
15. 15.🔌 Is a woollen thread a conductor or an insulator? (a) a conductor (b) an insulator
16. 16.Which of these means the circuit is closed? (a) the switch is OFF (b) the loop is complete (c) a wire is cut (d) the bulb is unscrewed
17. 17.🧩 Which part changes electrical energy into movement? (a) an LED (b) a fuse (c) a resistor (d) a motor
18. 18.True or false: to fly kites in open fields is not safe. (a) False (b) True
19. 19.🌐 A soil sensor sends a reading to an app every 30 minutes. How many readings arrive in 4 hours?
20. 20.🔁 repeat 2 times { repeat 3 times { beep } }
    How many beeps are there?
21. 21.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) series (b) parallel
22. 22.True or false: a laptop uses very little power. (a) False (b) True
23. 23.🔺 In the V-I-R triangle, how do we find V? (a) V = R ÷ I (b) V = I × R (c) V = I + R (d) V = I ÷ R
24. 24.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 9 V (d) 5 V
25. 25.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 200 Ω resistor? (a) red-black-black (b) red-black-brown (c) orange-red-brown (d) red-black-red
26. 26.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a steel spoon across the gap. Does the bulb glow? (a) No (b) Yes
27. 27.⚙️ What is an actuator? (a) a program (b) a battery (c) a sensor (d) an output that acts
28. 28.🔁 What does a variable do in a program? (a) stores a value (b) blinks an LED (c) joins two wires (d) measures light
29. 29.🔺 A 5 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
30. 30.🔺 A current of 40 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
32. 32.True or false: a circle with A inside is the symbol for an ammeter. (a) False (b) True
33. 33.⚡ Which formula gives electric power? (a) P = V + I (b) P = I ÷ V (c) P = V ÷ I (d) P = V × I
34. 34.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
35. 35.🔢 To run one loop of a plant-watering program, which comes first: “compare with the limit” or “read the soil sensor”? (a) read the soil sensor (b) compare with the limit
36. 36.🤖 if (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 40 %. What happens? (a) pump OFF (b) pump ON
37. 37.Which of these is measured in volts (V)? (a) resistance (b) voltage (c) energy used each second (d) current
38. 38.🔺 A 3.3 V supply is joined across a 330 Ω resistor. What current flows (in milliamperes, mA)?
39. 39.🔌 Which part of a screwdriver should an electrician hold? (a) the metal tip (b) the bare end (c) the plastic handle (d) the steel shaft
40. 40.🔁 Is the circuit closed or open if a cell is taken out? (a) open (b) closed

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