Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 21 · 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.✏️ Why do engineers draw circuits with symbols? (a) to hide the circuit (b) quick and clear for all (c) to make it colourful (d) symbols are heavier
2. 2.🌈 Which band is read first on a resistor? (a) the gold band (b) the one nearest an end (c) any band (d) the widest gap
3. 3.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
4. 4.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 10 (c) 60 (d) 1000
5. 5.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the battery (b) the process (c) the output (d) the input
6. 6.📶 Digital or analog: how bright a room is? (a) digital (b) analog
7. 7.⚡ What does a street light mainly change electricity into? (a) movement (b) light (c) sound (d) heat
8. 8.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) − (negative) (b) + (positive)
9. 9.🔢 To run one loop of a plant-watering program, which comes first: “wait a few seconds” or “read the soil sensor”? (a) wait a few seconds (b) read the soil sensor
10. 10.True or false: if the bulb is unscrewed, the circuit is open and no current flows. (a) False (b) True
11. 11.🔢 To get a sensor reading onto a phone, which is the FIRST step? (a) the app shows it (b) it is sent by Wi-Fi (c) the sensor measures (d) the board reads it
12. 12.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by aluminium foil. Does the bulb glow? (a) Yes (b) No
13. 13.🔌 Is a steel spoon a conductor or an insulator? (a) an insulator (b) a conductor
14. 14.True or false: the ammeter is joined across a part. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) a copper wire (b) an iron nail (c) a plastic ruler (d) a steel spoon
16. 16.🔍 Which is the odd one out? (a) a Wi-Fi weather station (b) a pencil sharpener (c) a Wi-Fi smart plug (d) a Wi-Fi doorbell camera
17. 17.Which of these is safe? (a) stay away from pylons (b) use a cable with cuts (c) climb an electric pole (d) fly a kite near wires
18. 18.🧮 A 2.2 V battery is joined to 3 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
19. 19.💡 2 identical bulbs are joined in series with a 3 V battery (ideal wires). How many volts does each bulb get? =
20. 20.Which of these is safe? (a) touch a fallen wire (b) touch a switch when wet (c) use small battery cells (d) climb an electric pole
21. 21.🔍 Which is the odd one out? (a) stay away from pylons (b) build with an adult near (c) dry your hands first (d) touch a fallen wire
22. 22.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a program (d) a battery
23. 23.⏱️ loop forever { LED ON; wait 1650 ms; LED OFF; wait 350 ms }
    How many times does the LED blink in 12 seconds?
24. 24.🔁 total = 0
    for i = 1 to 8 { total = total + i }
    What is total at the end?
25. 25.📏 Which unit measures the flow of charge? (a) ohm (Ω) (b) volt (V) (c) watt (W) (d) ampere (A)
26. 26.🔋 A 6 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
27. 27.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
28. 28.Which of these is a good habit? (a) post your live location (b) log out of shared phones (c) accept every permission (d) tap unknown app links
29. 29.🔁 What does “count = count + 1” do? (a) adds 1 to count (b) prints 1 (c) takes 1 away (d) sets count to 1
30. 30.True or false: to post your live location is a good habit. (a) False (b) True
31. 31.🌈 A resistor has the colour bands yellow, black, orange. What is its value (in ohms)?
32. 32.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 13 °C. What is shown? (a) Hot (b) Warm (c) Cool
33. 33.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) neither part (b) both parts (c) the else part (d) the if part
34. 34.🌐 A weather station sends one reading every 5 seconds. How many readings does it send in 1 minute?
35. 35.🔍 Which is the odd one out? (a) a rubber band (b) a copper wire (c) a wooden stick (d) a woollen thread
36. 36.True or false: triangle, bar and arrows is the symbol for an LED. (a) False (b) True
37. 37.🗺️ In an input → process → output plan, is “a buzzer beeps” the input, the process or the output? (a) process (b) input (c) output
38. 38.⚡ Which formula gives electric power? (a) P = V + I (b) P = I ÷ V (c) P = V × I (d) P = V ÷ I
39. 39.Which of these is a risky habit? (a) install software updates (b) cover unused cameras (c) read app permissions (d) share camera links
40. 40.🤖 Microcontroller or laptop: which one needs much more power? (a) laptop (b) microcontroller

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