Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 896 · 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 push button (b) a temperature sensor (c) a motor (d) a sound sensor
2. 2.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
   set pin 7 LOW
   set pin 7 HIGH
   set pin 8 LOW
   Is the LED ON or OFF at the end? (a) ON (b) OFF
3. 3.💡 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 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
4. 4.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
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 LOW
   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
6. 6.📶 How many states can a digital pin have? (a) two (b) one (c) ten (d) a thousand
7. 7.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
8. 8.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
9. 9.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
10. 10.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
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 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
12. 12.Which of these is an input? (a) a water pump (b) a motor (c) a buzzer (d) a light sensor
13. 13.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
14. 14.Which of these is an output? (a) a keypad (b) a water pump (c) a sound sensor (d) a light sensor
15. 15.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
16. 16.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
17. 17.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 9 V (d) 5 V
18. 18.Which of these is an input? (a) a speaker (b) a small display (c) a motion sensor (d) a servo motor
19. 19.💡 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
    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 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
21. 21.📶 Digital or analog: many values in a range? (a) digital (b) analog
22. 22.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
23. 23.🔍 Which is the odd one out? (a) a sound sensor (b) a water pump (c) a temperature sensor (d) a push button
24. 24.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
25. 25.💡 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) OFF (b) ON
26. 26.Which of these is an output? (a) a push button (b) a buzzer (c) a sound sensor (d) a motion sensor
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 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
28. 28.Which of these is an output? (a) a light sensor (b) a push button (c) a servo motor (d) a motion sensor
29. 29.🔌 Is a servo motor 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 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    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 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
32. 32.Which of these is an input? (a) a turning knob (b) a speaker (c) a buzzer (d) a servo motor
33. 33.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
34. 34.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
35. 35.💡 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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
36. 36.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
37. 37.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
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 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
39. 39.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF

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