Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 997 · 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.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
2. 2.Which of these is an output? (a) a push button (b) a speaker (c) a turning knob (d) a sound sensor
3. 3.📶 Digital or analog: the room temperature? (a) digital (b) analog
4. 4.💡 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
   set pin 7 LOW
   set pin 7 LOW
   set pin 8 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
5. 5.💡 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 8 LOW
   set pin 7 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
6. 6.💡 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 LOW
   set pin 8 LOW
   Is the LED ON or OFF at the end? (a) OFF (b) ON
7. 7.📶 How many states can a digital pin have? (a) one (b) ten (c) two (d) a thousand
8. 8.Which of these is an output? (a) a sound sensor (b) a buzzer (c) a push button (d) a temperature sensor
9. 9.🔍 Which is the odd one out? (a) a servo motor (b) a keypad (c) a temperature sensor (d) a sound sensor
10. 10.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
11. 11.Which of these is an output? (a) a temperature sensor (b) an LED (c) a light sensor (d) a turning knob
12. 12.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
13. 13.Which of these is an input? (a) a servo motor (b) a water pump (c) a small display (d) a light sensor
14. 14.Which of these is an input? (a) a servo motor (b) a speaker (c) an LED (d) a keypad
15. 15.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
16. 16.💡 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
17. 17.🔍 Which is the odd one out? (a) a buzzer (b) a motor (c) a small display (d) a motion sensor
18. 18.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) an LED (d) a sound sensor
19. 19.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
20. 20.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
21. 21.Which of these is an input? (a) a speaker (b) a motor (c) a turning knob (d) a servo motor
22. 22.💡 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
    Is the LED ON or OFF at the end? (a) ON (b) OFF
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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
24. 24.💡 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 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
25. 25.🔍 Which is the odd one out? (a) a temperature sensor (b) a small display (c) a keypad (d) a motion sensor
26. 26.💡 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 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
27. 27.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
28. 28.💡 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
    Is the LED ON or OFF at the end? (a) ON (b) OFF
29. 29.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
30. 30.🔍 Which is the odd one out? (a) a motor (b) a temperature sensor (c) a keypad (d) a push button
31. 31.Which of these is an input? (a) a speaker (b) a motor (c) an LED (d) a motion sensor
32. 32.Which of these is an input? (a) a buzzer (b) a push button (c) a motor (d) a small display
33. 33.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
34. 34.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
35. 35.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
36. 36.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
37. 37.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
38. 38.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
39. 39.💡 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
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
40. 40.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a temperature sensor (d) an LED

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