Electronics Worksheet: Input and Output Pins

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

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