Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 848 · 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 of these is an input? (a) a motor (b) a keypad (c) a speaker (d) an LED
2. 2.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
   set pin 8 LOW
   set pin 8 HIGH
   set pin 8 LOW
   Is the LED ON or OFF at the end? (a) ON (b) OFF
3. 3.Which of these is an input? (a) a turning knob (b) a servo motor (c) an LED (d) a water pump
4. 4.📶 Digital or analog: how bright a room is? (a) analog (b) digital
5. 5.🔍 Which is the odd one out? (a) a temperature sensor (b) a servo motor (c) a motion sensor (d) a light sensor
6. 6.🔍 Which is the odd one out? (a) a servo motor (b) an LED (c) a water pump (d) a turning knob
7. 7.💡 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
8. 8.Which of these is an input? (a) a water pump (b) a buzzer (c) a servo motor (d) a light sensor
9. 9.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) a push button (d) a speaker
10. 10.Which of these is an output? (a) a turning knob (b) a push button (c) a light sensor (d) a servo motor
11. 11.💡 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
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 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
13. 13.📶 How many states can a digital pin have? (a) two (b) ten (c) a thousand (d) one
14. 14.💡 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 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
15. 15.💡 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
16. 16.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
17. 17.🔍 Which is the odd one out? (a) a motion sensor (b) an LED (c) a speaker (d) a small display
18. 18.Which of these is an input? (a) a water pump (b) a speaker (c) a small display (d) a push button
19. 19.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
20. 20.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
21. 21.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
22. 22.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
23. 23.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
24. 24.💡 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
25. 25.Which of these is an output? (a) a light sensor (b) a keypad (c) a temperature sensor (d) a buzzer
26. 26.💡 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) ON (b) OFF
27. 27.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
28. 28.💡 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
29. 29.🔍 Which is the odd one out? (a) a keypad (b) a turning knob (c) a motion sensor (d) a motor
30. 30.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
31. 31.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
32. 32.💡 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
    Is the LED ON or OFF at the end? (a) ON (b) OFF
33. 33.🔍 Which is the odd one out? (a) a turning knob (b) a light sensor (c) a motion sensor (d) a speaker
34. 34.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
35. 35.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
36. 36.📶 Digital or analog: the room temperature? (a) digital (b) analog
37. 37.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
38. 38.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
39. 39.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
40. 40.🔍 Which is the odd one out? (a) a speaker (b) a small display (c) a water pump (d) a temperature sensor

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