Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 314 · 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.🤖 Does a TV remote usually have a microcontroller inside? (a) No (b) Yes
2. 2.🔍 Which is the odd one out? (a) stop if a part gets hot (b) touch a switch when wet (c) stay away from pylons (d) fly kites in open fields
3. 3.🔢 To get a sensor reading onto a phone, which is the FIRST step? (a) the board reads it (b) it is sent by Wi-Fi (c) the sensor measures (d) the app shows it
4. 4.⏱️ loop forever { LED ON; wait 1000 ms; LED OFF; wait 650 ms }
   How many milliseconds does one blink (ON + OFF) take?
5. 5.💡 6 identical bulbs are in parallel and each one takes 0.25 A. What total current (in amperes) comes from the battery? =
6. 6.⚡ A fan changes electrical energy mainly into which kind of energy? (a) light energy (b) sound energy (c) movement energy (d) chemical energy
7. 7.🔘 Which kind of switch flips up or down? (a) a push button (b) a toggle switch (c) a slide switch (d) a tilt switch
8. 8.🔌 Is a steel spoon a conductor or an insulator? (a) a conductor (b) an insulator
9. 9.Which of these is the output? (a) count button presses (b) the fan starts (c) a light level reading (d) a motion sensor signal
10. 10.Which of these has no microcontroller inside? (a) a smart watch (b) a digital thermometer (c) a TV remote (d) a spinning top
11. 11.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) each gets the full volts (c) a single current path (d) a break stops every bulb
12. 12.🌈 A resistor has the colour bands white, black, brown. What is its value (in ohms)?
13. 13.Which of these is a risky habit? (a) set up with a parent (b) cover unused cameras (c) keep factory passwords (d) install software updates
14. 14.🏠 Which is a smart-home example? (a) a printed map (b) a candle in a jar (c) a hand fan (d) lights on from an app
15. 15.True or false: to climb an electric pole is safe. (a) True (b) False
16. 16.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a rain sensor (c) a temperature sensor (d) a gas sensor
17. 17.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these is measured in watts (W)? (a) voltage (b) resistance (c) current (d) power
19. 19.True or false: to read app permissions is a risky habit. (a) False (b) True
20. 20.🔢 To get a sensor reading onto a phone, what comes right after “the sensor measures”? (a) the cloud stores it (b) it is sent by Wi-Fi (c) the board reads it (d) the app shows it
21. 21.Which of these is measured in amperes (A)? (a) energy used each second (b) the flow of charge (c) power (d) how much a part resists
22. 22.🌈 In the resistor colour code, which number does brown stand for?
23. 23.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
24. 24.🤖 “if (A AND B)” is true when … (a) only A is true (b) both A and B are true (c) both are false (d) only B is true
25. 25.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
26. 26.🔺 A current of 0.5 A flows when 7.5 V is joined across a resistor. What is its resistance (in ohms)?
27. 27.🧮 Resistors of 22 Ω, 20 Ω, 470 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
28. 28.🔋 Does a computer give electricity or use electricity? (a) uses electricity (b) gives electricity
29. 29.🔌 Is a graphite rod a conductor or an insulator? (a) a conductor (b) an insulator
30. 30.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) chemical energy (b) movement energy (c) light energy (d) sound energy
31. 31.Which drawing is the symbol for a bulb? (a) a straight line (b) two equal parallel lines (c) a circle with a cross (d) triangle, bar and arrows
32. 32.🤖 if (light < 500) { lamp ON } else { lamp OFF }
    The light sensor reads 635. What happens? (a) lamp OFF (b) lamp ON
33. 33.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 241. What happens? (a) lamp ON (b) lamp OFF
34. 34.🤖 if (sound > 80) { red LED ON } else { green LED ON }
    The sound sensor reads 80. What happens? (a) green LED ON (b) red LED ON
35. 35.What does an LDR do? (a) glows using little power (b) senses how bright it is (c) stores a little charge (d) smooths a wobbly supply
36. 36.True or false: “a motion sensor signal” is the process. (a) True (b) False
37. 37.Which of these is the input? (a) count button presses (b) check if temp > 30 (c) decide if soil is dry (d) a soil moisture reading
38. 38.True or false: “decide if soil is dry” is the input. (a) True (b) False
39. 39.True or false: triangle against a bar is the symbol for an ammeter. (a) False (b) True
40. 40.🧮 Adding another resistor in series makes the total resistance … (a) bigger (b) zero (c) stay the same (d) smaller

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