Question

What is the use of the Vin pin present on some Arduino Boards?

(a) To provide a 5V output

(b) Is used for plugging in 3V supply

(c) To power the Arduino Board

(d) To ground the Arduino Board

The question was asked in final exam.

I'd like to ask this question from Board Pinout Structure in division Board Specifications and Types of Arduino

Answer 1

The correct choice is (c) To power the Arduino Board

Explanation: The Vin Pin can be used for accepting a 9V power supply which is usually given through the external Jack. It can also be used for getting a 9V output when the Arduino is powered through the Jack, thus acting as both a power source and a short from the power source both when needed.