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31. A 12 address lines maps to the memory of

A. 1k bytes

B. 0.5k bytes

C. 2k bytes

D. None of these

Answer: 0.5k bytes

Explanation:

Here is no explanation for this answer

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32. Consider a machine with 64 MB physical memory and a 32-bit virtual address space. If the page size s 4KB, what is the approximate size of the page table?

A. 16 MB

B. 8 MB

C. 2 MB

D. 24 MB

Answer: 2 MB

Explanation:

Number of pages = 232 / 4KB = 220 as we need to map every possible virtual address.

So, we need 220 entries in the page table. Physical memory being 64 MB, a physical address must be 26 bits and a page (of size 4KB) address needs 26-12 = 14 address bits. So, each page table entry must be at least 14 bits.

So, total size of page table = 220 * 14 bits ~ 2 MB

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33. Size of virtual memory depends on

A. size of data bus

B. size of address bus

C. size of main memory

D. none of above

Answer: size of address bus

Explanation:

Here is no explanation for this answer

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34. Thrashing can be avoided if

A. The pages, belonging to the working set of the programs, are in main memory

B. The speed of CPU is increased

C. The speed of I/O processor are increased

D. All of the above

Answer: The pages, belonging to the working set of the programs, are in main memory

Explanation:

Here is no explanation for this answer

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35. Disk scheduling includes deciding

A. which should be accessed next

B. order in which disk access requests must be serviced

C. the physical location of the file

D. the logical location of the file

Answer: order in which disk access requests must be serviced

Explanation:

Here is no explanation for this answer

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36. Which is not a memory management scheme?

A. buddy system

B. swapping

C. monitors

D. paging

Answer: monitors

Explanation:

Here is no explanation for this answer

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37. Main function of shared memory is:

A. to use primary memory efficently

B. to do intra process communication

C. to do inter process communication

D. none of above

Answer: to do inter process communication

Explanation:

Here is no explanation for this answer

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38. How many primary partitions can be created?

A. 1

B. 2

C. 3

D. 4

Answer: 3

Explanation:

Here is no explanation for this answer

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39. Reference bit is used for

A. Implementing LRU page replacement algorithm

B. Implementing NRU algorithm

C. To check the page table entry in the cache memory

D. None of Above

Answer: Implementing NRU algorithm

Explanation:

Here is no explanation for this answer

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40. Which of the following is not a system file?

A. Packet switching

B. .com

C. .ini

D. none

Answer: .ini

Explanation:

Here is no explanation for this answer

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