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21. 

Backing storage is so named because it
A. is always kept at the back of the CP.U.
B. is slow and backward
C. backs up the computer's main memory
D. lags behind the main memory
E. None of the above
22. 

The ASCII code for the character J is:
A. 1001 0001
B. 1001 1010
C. 0100 1010
D. 1010 0001
E. None of the above
23. 

Off-line operation is the operation of devices without the control of
A. Memory
B. CPU
C. ALU
D. Control unit
E. None of the above
24. 

What is meant by a dedicated computer?
A. Which is used by one person only
B. Which is assigned one and only one task
C. Which uses on kind of software
D. Which is meant for application software only
E. None of the above
25. 

Which of the following is the user programmed semiconductor memory?
A. SRAM
B. DRAM
C. EPROM
D. All of the above
E. None of the above