Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 187 · 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.True or false: “compare with a limit” is the output. (a) True (b) False
2. 2.Which of these usually has a microcontroller inside? (a) a candle (b) a hand pump (c) a plain wall switch (d) a microwave oven
3. 3.🔢 To run one loop of a plant-watering program, which is the LAST step? (a) wait a few seconds (b) switch the pump on/off (c) compare with the limit (d) read the soil sensor
4. 4.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
5. 5.🗺️ Before building a project, what should you write down first? (a) nothing at all (b) the final price (c) the box colour (d) inputs and outputs
6. 6.💡 A red LED (it uses 2 V) is joined with a 200 Ω resistor to a 3 V supply. What current flows (in mA)?
7. 7.⚡ What does a night lamp mainly change electricity into? (a) movement (b) heat (c) light (d) sound
8. 8.🗺️ In an input → process → output plan, is “an alert on the phone” the input, the process or the output? (a) process (b) output (c) input
9. 9.🔍 Which is the odd one out? (a) a ceramic cup (b) a glass marble (c) a paper strip (d) a steel spoon
10. 10.Which job is done by the voltage regulator? (a) shows the board is on (b) keeps the voltage steady (c) brings power and code (d) connect sensors and LEDs
11. 11.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) True (b) False
12. 12.🔋 Does a cell give electricity or use electricity? (a) gives electricity (b) uses electricity
13. 13.⚡ Power tells us … (a) the colour of light (b) energy used each second (c) the size of a cell (d) the length of a wire
14. 14.🔘 A cell and a bulb are joined to 4 side-by-side paths with one switch on each path — A, B, C and D (parallel). A is OFF, B is ON, C is ON and D is OFF. Does the bulb glow? (a) No (b) Yes
15. 15.True or false: a motor smooths a wobbly supply. (a) True (b) False
16. 16.🔢 To run one loop of a plant-watering program, which is the FIRST step? (a) compare with the limit (b) wait a few seconds (c) read the soil sensor (d) switch the pump on/off
17. 17.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
18. 18.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
19. 19.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 13 °C. What is shown? (a) Hot (b) Cool (c) Warm
20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
21. 21.🔍 Which is the odd one out? (a) take cells out after use (b) keep drinks far away (c) touch a switch when wet (d) use small battery cells
22. 22.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
23. 23.⏱️ How many milliseconds is a wait of 0.6 seconds?
24. 24.🤖 if (moisture < 40) { pump ON } else { pump OFF }
    The soil moisture sensor reads 50 %. What happens? (a) pump ON (b) pump OFF
25. 25.🔍 Which is the odd one out? (a) throw cells in a fire (b) fly kites in open fields (c) dry your hands first (d) use small battery cells
26. 26.🔘 What does a switch do in a circuit? (a) opens or closes the loop (b) changes the voltage (c) stores current (d) makes electricity
27. 27.🔍 Which is the odd one out? (a) a doorbell (b) a siren (c) a loudspeaker (d) a torch
28. 28.📶 Digital or analog: many values in a range? (a) analog (b) digital
29. 29.✏️ In a circuit diagram, which part is drawn as a circle with V inside? (a) battery (b) motor (c) bulb (d) voltmeter
30. 30.🤖 Microcontroller or laptop: which one has no screen of its own? (a) microcontroller (b) laptop
31. 31.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the else part (b) both parts (c) neither part (d) the if part
32. 32.Which of these is a conductor? (a) a dry cork (b) a wooden stick (c) a rubber band (d) a graphite rod
33. 33.True or false: “a single current path” is true of a parallel circuit. (a) False (b) True
34. 34.Which of these is measured in amperes (A)? (a) current (b) power (c) the push of a cell (d) resistance
35. 35.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
36. 36.True or false: a straight line is the symbol for a wire. (a) True (b) False
37. 37.🔐 Is it a good or a risky habit to share only needed data? (a) risky habit (b) good habit
38. 38.🏠 Which is a smart-home example? (a) a hand fan (b) a printed map (c) lights on from an app (d) a candle in a jar
39. 39.🔋 7 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
40. 40.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. Does bulb 2 glow? (a) Yes (b) No

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