Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 979 · 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.💡 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) ON (b) OFF
2. 2.🔍 Which is the odd one out? (a) a water pump (b) a push button (c) a temperature sensor (d) a motion sensor
3. 3.💡 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) ON (b) OFF
4. 4.💡 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 8 HIGH
   set pin 8 HIGH
   set pin 7 LOW
   Is the LED ON or OFF at the end? (a) ON (b) OFF
5. 5.📶 How many states can a digital pin have? (a) two (b) ten (c) a thousand (d) one
6. 6.Which of these is an input? (a) a buzzer (b) a small display (c) a temperature sensor (d) a water pump
7. 7.🔍 Which is the odd one out? (a) a speaker (b) a sound sensor (c) a motor (d) a buzzer
8. 8.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
9. 9.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
10. 10.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
11. 11.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
12. 12.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an output (d) an input
13. 13.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
14. 14.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
15. 15.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
16. 16.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
17. 17.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
18. 18.Which of these is an input? (a) a water pump (b) a servo motor (c) an LED (d) a light sensor
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 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
20. 20.💡 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 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
21. 21.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
22. 22.🔍 Which is the odd one out? (a) a small display (b) a buzzer (c) a push button (d) a speaker
23. 23.💡 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
24. 24.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
25. 25.Which of these is an output? (a) a buzzer (b) a temperature sensor (c) a keypad (d) a sound sensor
26. 26.🔍 Which is the odd one out? (a) a small display (b) an LED (c) a motor (d) a turning knob
27. 27.Which of these is an input? (a) a buzzer (b) a motor (c) a small display (d) a motion sensor
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 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
29. 29.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 0 V (d) 230 V
30. 30.💡 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
31. 31.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
32. 32.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a servo motor (d) a keypad
33. 33.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
34. 34.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
35. 35.📶 Digital or analog: how bright a room is? (a) analog (b) digital
36. 36.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
37. 37.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
38. 38.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
39. 39.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
40. 40.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF

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