PC
"Touch screen "acts as both input and output devices
A keyboard is an input device. A modem is both an input and an output device. A CPU is the central processor and is connected to both input and output devices but is itself neither.
Touchscreens, for one.
Neither. A computer contains both input and output devices. Many modern input and output devices contain embedded computers, that interface between the main computer and the actual input or output hardware of the device.
both
A printer is an output device. The keyboard is an input device.
input
A modem is one of those devices that is both an input and an output device.
There both
are space satellites input or output devices
They're both! Monitors are output devices and so are printers. A common input devices would be keyboards or mice and all are considered hardware.
A phone is both an input and an output device since it must both receive and send audio.