Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 761 · 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.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) a turning knob (b) a sound sensor (c) a push button (d) a servo motor
3. 3.🔍 Which is the odd one out? (a) a sound sensor (b) a speaker (c) a push button (d) a turning knob
4. 4.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) one (d) two
5. 5.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
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 8 LOW
   Is the LED ON or OFF at the end? (a) OFF (b) ON
7. 7.💡 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 LOW
   set pin 7 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
8. 8.💡 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 7 HIGH
   set pin 7 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
9. 9.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
10. 10.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
11. 11.💡 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
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
12. 12.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
13. 13.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
14. 14.🔍 Which is the odd one out? (a) a speaker (b) a water pump (c) a sound sensor (d) a servo motor
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 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
16. 16.Which of these is an input? (a) a push button (b) a small display (c) a motor (d) a buzzer
17. 17.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 5 V (d) 50 V
18. 18.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) a light sensor (d) a 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 8 HIGH
    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
20. 20.Which of these is an input? (a) a motor (b) a buzzer (c) a turning knob (d) a water pump
21. 21.💡 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 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
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 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
23. 23.🔍 Which is the odd one out? (a) a motor (b) a sound sensor (c) a light sensor (d) a keypad
24. 24.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
25. 25.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
26. 26.Which of these is an output? (a) a turning knob (b) a temperature sensor (c) a motor (d) a push button
27. 27.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) an output (d) a battery
28. 28.📶 Digital or analog: how bright a room is? (a) analog (b) digital
29. 29.Which of these is an output? (a) a temperature sensor (b) a small display (c) a keypad (d) a light sensor
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 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
31. 31.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
32. 32.Which of these is an output? (a) a keypad (b) a speaker (c) a turning knob (d) a motion sensor
33. 33.True or false: “the room temperature” is a digital signal. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) a water pump (b) a speaker (c) a small display (d) a keypad
35. 35.Which of these is an input? (a) a speaker (b) a servo motor (c) a motor (d) a keypad
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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
37. 37.💡 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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
39. 39.💡 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
    set pin 8 LOW
    set pin 8 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON

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