Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 445 · 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 a cell symbol, which line is the + terminal? (a) neither line (b) both lines (c) the longer line (d) the shorter line
2. 2.📶 Digital or analog: many values in a range? (a) digital (b) analog
3. 3.Which of these usually has a microcontroller inside? (a) a hand pump (b) a microwave oven (c) a plain wall switch (d) a wind-up toy
4. 4.True or false: “a motion sensor signal” is the input. (a) False (b) True
5. 5.What does the cloud server do? (a) reads values, decides (b) measures the real world (c) stores data online (d) acts on a command
6. 6.True or false: “used in house wiring” is true of a series circuit. (a) False (b) True
7. 7.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 650 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
8. 8.⚡ What does a rice cooker mainly change electricity into? (a) sound (b) heat (c) movement (d) light
9. 9.🔌 Is a graphite rod a conductor or an insulator? (a) an insulator (b) a conductor
10. 10.True or false: “each gets the full volts” is true of a series circuit. (a) True (b) False
11. 11.💡 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?
12. 12.Which of these is the input? (a) compare with a limit (b) an LED lights up (c) a light level reading (d) count button presses
13. 13.🔁 total = 0
    for i = 1 to 8 { total = total + i }
    What is total at the end?
14. 14.True or false: triangle, bar and arrows is the symbol for an LED. (a) True (b) False
15. 15.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
17. 17.🤖 Microcontroller or laptop: which one runs one small program? (a) laptop (b) microcontroller
18. 18.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
20. 20.Which of these is true of a series circuit? (a) each gets the full volts (b) one bulb out, all go out (c) own switch for each bulb (d) one out, the rest glow
21. 21.🔌 Is a metal paper clip a conductor or an insulator? (a) a conductor (b) an insulator
22. 22.🔁 total = 0
    for i = 1 to 4 { total = total + i }
    What is total at the end?
23. 23.True or false: a rice cooker mainly gives out light. (a) True (b) False
24. 24.🧩 Which part changes electrical energy into sound? (a) a buzzer (b) a diode (c) a resistor (d) a capacitor
25. 25.🔁 What does “count = count + 1” do? (a) sets count to 1 (b) takes 1 away (c) prints 1 (d) adds 1 to count
26. 26.🌐 Is an app-controlled bulb an IoT device? (a) an IoT device (b) not an IoT device
27. 27.Which of these is an IoT device? (a) a plain wall switch (b) a plain table fan (c) a smart energy meter (d) a wind-up clock
28. 28.True or false: the ammeter measures voltage. (a) False (b) True
29. 29.💡 5 identical bulbs are joined in series with a 15 V battery (ideal wires). How many volts does each bulb get? =
30. 30.🌐 What does IoT stand for? (a) Input of Tools (b) Internet of Talk (c) Inside of Toys (d) Internet of Things
31. 31.📏 How many milliamperes (mA) make 1 ampere? (a) 100 (b) 60 (c) 1000 (d) 10
32. 32.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
33. 33.Which of these is measured in watts (W)? (a) power (b) voltage (c) the push of a cell (d) the flow of charge
34. 34.🔺 A current of 1 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
35. 35.🔺 In the V-I-R triangle, how do we find I? (a) I = V × R (b) I = V ÷ R (c) I = V + R (d) I = R ÷ V
36. 36.📏 Which unit measures resistance? (a) ohm (Ω) (b) watt (W) (c) volt (V) (d) ampere (A)
37. 37.True or false: on an LED, the leg by the flat edge is the cathode (−). (a) False (b) True
38. 38.🔺 In the V-I-R triangle, how do we find R? (a) R = V + I (b) R = V ÷ I (c) R = V × I (d) R = I ÷ V
39. 39.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a temperature sensor (c) a sound sensor (d) a distance sensor
40. 40.🌐 Is a Wi-Fi weather station an IoT device? (a) an IoT device (b) not an IoT device

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