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21. Which of the following is/are advantages of virtual memory ?
Faster access to memory on an average.
Processes can be given protected address spaces.
Programms larger than the physical memory size can be run.
All of these
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22. Which of the following need extra hardware for DRAM refreshing ?
8085
Motorla-68000
Both (a) and (b)
None of these
23. The idea of cache memory is based on
The property of locality of reference
The heuristic 90-10 rule
The fact that only a small portion of a program is referenced relatively frequently
24. Property of locality of reference may fail, if a program has
Many conditional jumps
Many unconditional jumps
Many operands
Many Operators
25. What is the correct sequence of time delays that happen during a data transfer from a disk to memory?
Seek time, access time, transfer time
Seek time, latency time, transfer time
Access time ,Latency time, transfer time
Latency time, access time, transfer time
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