Which device translates the vibrations in the air into an electric current and sends it to the sound card?
Scanner
Digital camera
OCR
Microphone
Which printer operates like a typewriter, pressing a typeface against paper and ink ribbon?
Impact
Non impact
Laser
Inkjet
Which one is said to be a tangible units in computer?
Programs
Software
Hardware
None of these
Who invented calculator?
John Napier
Blaise Pascal
Joseph Marie Jacquard
Charles Babbage
Which is an optical disk?
Floppy disk
CD ROM
Hard disk
Tape
The main memory is generally referred to as :
CD
RAM
All of these
