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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 952 · 40 questions
TalentJR

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.

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  1. 1.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a keypad (d) an LED
  2. 2.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  3. 3.Which of these is an output? (a) a turning knob (b) a motion sensor (c) a buzzer (d) a light sensor
  4. 4.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) a turning knob (d) a small display
  5. 5.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) a temperature sensor (d) a light sensor
  6. 6.Which of these is an output? (a) a water pump (b) a light sensor (c) a keypad (d) a temperature sensor
  7. 7.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  8. 8.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  9. 9.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  10. 10.💡 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
  11. 11.Which of these is an input? (a) a buzzer (b) a small display (c) an LED (d) a temperature sensor
  12. 12.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  14. 14.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 0 V (d) 9 V
  15. 15.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  16. 16.Which of these is an output? (a) a sound sensor (b) a push button (c) a motor (d) a motion sensor
  17. 17.📶 How many states can a digital pin have? (a) two (b) one (c) a thousand (d) ten
  18. 18.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  20. 20.🔍 Which is the odd one out? (a) a push button (b) a temperature sensor (c) a light sensor (d) a motor
  21. 21.🔍 Which is the odd one out? (a) an LED (b) a keypad (c) a small display (d) a water pump
  22. 22.Which of these is an input? (a) a servo motor (b) a buzzer (c) a water pump (d) a light sensor
  23. 23.True or false: “many values in a range” is a digital signal. (a) False (b) True
  24. 24.Which of these is an output? (a) a push button (b) a temperature sensor (c) a speaker (d) a turning knob
  25. 25.📶 Digital or analog: many values in a range? (a) digital (b) analog
  26. 26.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.Which of these is an input? (a) a small display (b) a turning knob (c) an LED (d) a water pump
  29. 29.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  30. 30.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  31. 31.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  33. 33.Which of these is an input? (a) a motion sensor (b) an LED (c) a motor (d) a buzzer
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.🔍 Which is the odd one out? (a) a buzzer (b) a temperature sensor (c) an LED (d) a water pump
  36. 36.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 230 V (d) 50 V
  37. 37.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  38. 38.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a servo motor (d) a motor
  39. 39.🔍 Which is the odd one out? (a) a sound sensor (b) a servo motor (c) a temperature sensor (d) a light sensor
  40. 40.💡 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 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

  1. an LED
  2. True
  3. a buzzer
  4. a small display
  5. a buzzer
  6. a water pump
  7. True
  8. an input
  9. output
  10. ON
  11. a temperature sensor
  12. OFF
  13. input
  14. 0 V
  15. input
  16. a motor
  17. two
  18. OFF
  19. True
  20. a motor
  21. a keypad
  22. a light sensor
  23. False
  24. a speaker
  25. analog
  26. OFF
  27. ON
  28. a turning knob
  29. input
  30. output
  31. ON
  32. analog
  33. a motion sensor
  34. OFF
  35. a temperature sensor
  36. 5 V
  37. False
  38. a light sensor
  39. a servo motor
  40. OFF

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