Operating Systems Concepts – Section 2


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26. The dispatcher

A. actually schedules the tasks into the processor
B. puts tasks in I/O wait
C. is always small and simple
D. never changes task priorities
E. None of the above

Correct Answer: A. actually schedules the tasks into the processor
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27. System programs such as Compilers are designed so that they are

A. reenterable
B. non reusable
C. serially usable
D. recursive
E. None of the above

Correct Answer: A. reenterable
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28. IBM released its first PC in 1981. Can you name the operating system which was most popular at that time?

A. MS-DOS
B. PC-DOS
C. OS/360
D. CP/M
E. None of the above

Correct Answer: D. CP/M
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29. If the number of bits in a virtual address of a program is 16 and the page size is 0.5 K bytes, the number of pages in the virtual address space is

A. 16
B. 32
C. 64
D. 128
E. None of the above

Correct Answer: D. 128
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30. Which table is a permanent database that has an entry for each terminal symbol.

A. Terminal table
B. Literal table
C. Identifier table
D. Reductions
E. None of the above

Correct Answer: A. Terminal table
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