21. Virtual Memory

A. is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
B. consists of those addresses that may be generated by a processor during execution of a computation.
C. is a method of allocating processor time.
D. allows multiple programs to reside in separate areas of core at the time.
E. None of the above

22. In a magnetic disk, data is recorded in a set of concentric tracks which are subdivided into

A. periods
B. sectors
C. zones
D. groups
E. None of the above

23. The total time to prepare a disk drive mechanism for a block of data to be read from it is

A. latency
B. latency plus transmission time
C. latency plus seek time
D. latency plus seek time plus transmission time
E. None of the above

24. Part of a program where the shared memory is accessed and which should be executed invisibly is called

A. semaphores
B. directory
C. critical section
D. mutual exclusion
E. None of the above

25. Indicate which, of the following, is not true about Nassi-Shneiderman charts

A. These charts are type of graphical design tool
B. These charts cannot represent CASE constructs
C. These charts can represent three fundamental control structures
D. All of the above
E. None of the above