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Today General Knowledge(GK)
Which of the following is directly controlled from a keyboard.
A)
Magnetic disk
B)
Magnetic tape
C)
Punched paper tape
D)
Card punch

Correct Answer : Option (D) - Card punch



A punched card (also Card punch or punched-card) is a piece of stiff paper that holds digital data represented by the presence or absence of holes in predefined positions. Punched cards were once common in data processing applications or to directly control automated machinery.
 
Punched cards were widely used through much of the 20th century in the data processing industry, where specialized and increasingly complex unit record machines, organized into semiautomatic data processing systems, used punched cards for data input, output, and storage. The IBM 12-row/80-column punched card format came to dominate the industry. Many early digital computers used punched cards as the primary medium for input of both computer programs and data.

Published On : June 18, 2021
Category : Computers
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