Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 858 · 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 8. All pins start LOW. The program runs once:
   set pin 7 LOW
   set pin 8 LOW
   set pin 8 LOW
   set pin 8 LOW
   Is the LED ON or OFF at the end? (a) ON (b) OFF
2. 2.Which of these is an output? (a) a turning knob (b) a water pump (c) a keypad (d) a light sensor
3. 3.📶 How many states can a digital pin have? (a) a thousand (b) two (c) one (d) ten
4. 4.Which of these is an output? (a) a push button (b) a temperature sensor (c) an LED (d) a turning knob
5. 5.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
6. 6.💡 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
   Is the LED ON or OFF at the end? (a) ON (b) OFF
7. 7.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
8. 8.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a keypad (d) a speaker
9. 9.True or false: “how bright a room is” is a digital signal. (a) True (b) False
10. 10.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
12. 12.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
13. 13.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
14. 14.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
15. 15.💡 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 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
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
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
17. 17.💡 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) ON (b) OFF
18. 18.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
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 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
20. 20.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
21. 21.💡 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 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
22. 22.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
23. 23.🔍 Which is the odd one out? (a) a water pump (b) a small display (c) a buzzer (d) a push button
24. 24.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
25. 25.Which of these is an input? (a) a water pump (b) a small display (c) a sound sensor (d) a servo motor
26. 26.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
27. 27.💡 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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
28. 28.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 50 V (d) 0 V
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 HIGH
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
30. 30.🔍 Which is the odd one out? (a) a motion sensor (b) a water pump (c) a motor (d) a small display
31. 31.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
32. 32.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) an LED (d) a push button
33. 33.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
34. 34.Which of these is an input? (a) an LED (b) a buzzer (c) a keypad (d) a water pump
35. 35.True or false: “many values in a range” is a digital signal. (a) True (b) False
36. 36.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
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 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
38. 38.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
39. 39.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a buzzer (d) a turning knob
40. 40.💡 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
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF

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