Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 688 · 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.🔐 Is it a good or a risky habit to share camera links? (a) good habit (b) risky habit
2. 2.🧩 Which component lets current go one way? (a) diode (b) LDR (c) fuse (d) motor
3. 3.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 60 (c) 10 (d) 1000
4. 4.🔋 How many 1.5 V cells must be joined in series to give 10.5 V?
5. 5.🌈 Which band is read first on a resistor? (a) any band (b) the widest gap (c) the one nearest an end (d) the gold band
6. 6.🔍 Which is the odd one out? (a) a paper calendar (b) a Wi-Fi weather station (c) a wind-up clock (d) a plain wall switch
7. 7.📶 Digital or analog: the room temperature? (a) analog (b) digital
8. 8.⚠️ Is it safe to dry your hands first? (a) not safe (b) safe
9. 9.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 4 of the switches are OFF and the rest are ON. How many bulbs glow?
10. 10.🔋 Does a refrigerator give electricity or use electricity? (a) gives electricity (b) uses electricity
11. 11.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
12. 12.🧩 A capacitor in a circuit can … (a) make light (b) store charge briefly (c) measure heat (d) spin a wheel
13. 13.🔺 A current of 10 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
14. 14.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 11 °C. What is shown? (a) Warm (b) Cool (c) Hot
15. 15.True or false: a push button flips up or down. (a) False (b) True
16. 16.True or false: on an LED, the round-side leg is the cathode (−). (a) True (b) False
17. 17.🤖 Microcontroller or laptop: which one uses very little power? (a) microcontroller (b) laptop
18. 18.📏 Which unit measures the flow of charge? (a) volt (V) (b) ohm (Ω) (c) ampere (A) (d) watt (W)
19. 19.💡 What happens if an LED is put in backwards? (a) it makes a sound (b) it lights brighter (c) it changes colour (d) it does not light
20. 20.Which of these is the output? (a) compare with a limit (b) a button press (c) count button presses (d) a buzzer beeps
21. 21.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a buzzer (c) a capacitor (d) a diode
22. 22.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the if part (b) the else part (c) both parts (d) neither part
23. 23.📏 How many amperes (A) is 1490 mA? =
24. 24.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in parallel (b) in series (c) not joined (d) by Wi-Fi
25. 25.🧮 A 0.6 V battery is joined to 3 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
26. 26.Which of these mainly makes movement? (a) a torch (b) an electric toy car (c) a room heater (d) a doorbell
27. 27.📏 Which unit measures the push of a cell? (a) ohm (Ω) (b) volt (V) (c) ampere (A) (d) watt (W)
28. 28.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
29. 29.🔺 A current of 3 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
30. 30.Which of these is true of a series circuit? (a) each gets the full volts (b) one out, the rest glow (c) own switch for each bulb (d) bulbs share the voltage
31. 31.True or false: the ammeter measures current. (a) True (b) False
32. 32.🧮 Two equal 40 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
33. 33.True or false: to keep factory passwords is a good habit. (a) True (b) False
34. 34.True or false: to use daylight to read saves electricity. (a) False (b) True
35. 35.Which of these has no microcontroller inside? (a) a microwave oven (b) a TV remote (c) a washing machine (d) a plain wall switch
36. 36.Which drawing is the symbol for a capacitor? (a) a line lifted at a gap (b) two equal parallel lines (c) a plain rectangle (d) a circle with M inside
37. 37.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
38. 38.🔁 repeat 4 times { repeat 6 times { beep } }
    How many beeps are there?
39. 39.🧭 Which part of a microcontroller board brings power and code? (a) the pins (b) the power LED (c) the reset button (d) the USB port
40. 40.🤖 Does a bicycle bell usually have a microcontroller inside? (a) Yes (b) No

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