Question

A scanner is an output device similar to a printer true or false

Answer 1

False. A scanner is a input device where as printer is output device

Answer 2

Scanner is an input device

EXPLANATION:  

Computer devices can be categorized in to input and output devices. Keyboard, mouse and scanner falls under input devices category. Because as the name indicates mouse and keyboard gives input to the computer. Similarly scanner gives the physical media like paper or document as input and produces the  digital format as output. Printer and monitor produces the results as output. So they are output devices.