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21. 

While running DOS on a PC, which command would be used to duplicate the entire diskette?
A. COPY
B. DISKCOPY
C. CHKDSK
D. TYPE
E. None of the above
22. 

Memory
A. is a device that performs a sequence of operations specified by instructions in memory.
B. is the device where information is stored
C. is a sequence of instructions
D. is typically characterized by interactive processing and time-slicing of the CPU's time to allow quick response to each user.
E. None of the above
23. 

Which of the following rules out the use of GO TO?
A. Flowchart
B. HIPO-DIAGRAMS
C. Nassi-Shneiderman diagram
D. All of the above
E. None of the above
24. 

A system program that sets up an executable program in main memory ready for execution is
A. assembler
B. linker
C. loader
D. compiler
E. None of the above
25. 

Which of the following are loaded into main memory when the computer is booted?
A. internal command instructions
B. external command instructions
C. utility programs
D. word processing instructions
E. None of the above