Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 581 · 40 questions

Remember (Read in, drive out): Inputs: buttons, knobs, sensors. Outputs: LEDs, buzzers, motors, displays. Digital: HIGH (≈ 5 V) or LOW (0 V) only. Analog: any value in a range. Trace the program: only the LED’s own pin matters, and its last command decides ON or OFF.

1. 1.🔍 Which is the odd one out? (a) a servo motor (b) a buzzer (c) a motor (d) a push button
2. 2.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
   set pin 7 HIGH
   set pin 7 LOW
   Is the LED ON or OFF at the end? (a) OFF (b) ON
3. 3.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) a small display (b) a sound sensor (c) an LED (d) a servo motor
5. 5.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
6. 6.Which of these is an input? (a) a water pump (b) a motor (c) a push button (d) a small display
7. 7.Which of these is an output? (a) a sound sensor (b) a motion sensor (c) a push button (d) a speaker
8. 8.Which of these is an output? (a) a servo motor (b) a motion sensor (c) a light sensor (d) a keypad
9. 9.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
   set pin 8 HIGH
   set pin 8 HIGH
   set pin 8 LOW
   set pin 8 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
10. 10.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
11. 11.Which of these is an input? (a) a buzzer (b) a motion sensor (c) a speaker (d) an LED
12. 12.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
13. 13.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
14. 14.🔍 Which is the odd one out? (a) a sound sensor (b) a turning knob (c) a buzzer (d) a temperature sensor
15. 15.🔍 Which is the odd one out? (a) a motor (b) a water pump (c) a keypad (d) a small display
16. 16.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
17. 17.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
18. 18.Which of these is an output? (a) a temperature sensor (b) a push button (c) a light sensor (d) a water pump
19. 19.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
20. 20.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
21. 21.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 1.5 V (d) 0 V
22. 22.Which of these is an input? (a) a small display (b) an LED (c) a speaker (d) a sound sensor
23. 23.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
24. 24.True or false: “the room temperature” is a digital signal. (a) True (b) False
25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
26. 26.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
27. 27.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
28. 28.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
29. 29.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
30. 30.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
31. 31.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
32. 32.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
33. 33.🔍 Which is the odd one out? (a) a turning knob (b) a push button (c) an LED (d) a sound sensor
34. 34.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 230 V (d) 50 V
35. 35.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
36. 36.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
37. 37.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
38. 38.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
39. 39.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
40. 40.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output

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