Question

By default, the GPIO pins in Raspberry Pi are configured as? Input except pins 14 and 15 Output except pins 14 and 15 Bcm GPIO 1 point

Answer 1

The answer is Option 1.

By default, the GPIO (General Purpose Input Output) pins in the Raspberry Pi are configured as Input except pins 14 and 15. There are totally 17 basic GPIO pins and they are located on the header of the Raspberry device.

Answer 2

Some of the GPIO pins also have a specific alternative function. These alternative functions are tied to special hardware in the cpu which is why only some pins have alternate functions. Typical alternative functions are UART (generally also called serial, but there are other types if serial communication), SPI, I2C and PWM.

UART is a bidirectional serial protocol, but can be used in a unidirectional way. It requires 1 pin for input (aka rx) and 1 pin for output (aka tx). This is why there are two pins labeled as UART.