Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 55 · 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) input (b) output
2. 2.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
3. 3.💡 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 LOW
   set pin 7 HIGH
   set pin 7 HIGH
   Is the LED ON or OFF at the end? (a) ON (b) OFF
4. 4.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) a battery (d) an input
5. 5.💡 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 8 LOW
   set pin 8 HIGH
   set pin 7 HIGH
   Is the LED ON or OFF at the end? (a) ON (b) OFF
6. 6.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
7. 7.🔍 Which is the odd one out? (a) an LED (b) a sound sensor (c) a light sensor (d) a push button
8. 8.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
9. 9.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
10. 10.🔍 Which is the odd one out? (a) a keypad (b) a turning knob (c) a motor (d) a light sensor
11. 11.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
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 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
13. 13.🔍 Which is the odd one out? (a) a sound sensor (b) a keypad (c) a small display (d) a light sensor
14. 14.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 50 V (d) 5 V
15. 15.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) a buzzer (d) a speaker
16. 16.💡 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 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
17. 17.📶 Digital or analog: the room temperature? (a) digital (b) analog
18. 18.💡 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) OFF (b) ON
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 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    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 7 LOW
    set pin 8 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 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
22. 22.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
23. 23.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 0 V (d) 5 V
24. 24.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
25. 25.Which of these is an output? (a) a push button (b) a keypad (c) a temperature sensor (d) a servo motor
26. 26.💡 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 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
28. 28.💡 An LED (with its resistor) is on pin 7. 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
29. 29.📶 How many states can a digital pin have? (a) two (b) one (c) ten (d) a thousand
30. 30.💡 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
    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 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
32. 32.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a small display (d) a turning knob
33. 33.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
34. 34.Which of these is an input? (a) an LED (b) a servo motor (c) a motor (d) a light sensor
35. 35.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
36. 36.💡 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
    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 HIGH
    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
38. 38.Which of these is an output? (a) a speaker (b) a sound sensor (c) a push button (d) a turning knob
39. 39.💡 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
40. 40.Which of these is an output? (a) a water pump (b) a turning knob (c) a keypad (d) a sound sensor

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids