Operating Systems Concepts – Section 2

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

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

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

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

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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