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31 / 224
A 12 address lines maps to the memory of
A1k bytes
B0.5k bytes
C2k bytes
DNone of these
Answer: Option B
Explanation:Here is no explanation for this answer
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32 / 224
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?
A16 MB
B8 MB
C2 MB
D24 MB
Answer: Option C
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 / 224
Size of virtual memory depends on
Asize of data bus
Bsize of address bus
Csize of main memory
Dnone of above
Answer: Option B
Explanation:Here is no explanation for this answer
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34 / 224
Thrashing can be avoided if
AThe pages, belonging to the working set of the programs, are in main memory
BThe speed of CPU is increased
CThe speed of I/O processor are increased
DAll of the above
Answer: Option A
Explanation:Here is no explanation for this answer
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35 / 224
Disk scheduling includes deciding
Awhich should be accessed next
Border in which disk access requests must be serviced
Cthe physical location of the file
Dthe logical location of the file
Answer: Option B
Explanation:Here is no explanation for this answer
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36 / 224
Which is not a memory management scheme?
Abuddy system
Bswapping
Cmonitors
Dpaging
Answer: Option C
Explanation:Here is no explanation for this answer
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37 / 224
Main function of shared memory is:
Ato use primary memory efficently
Bto do intra process communication
Cto do inter process communication
Dnone of above
Answer: Option C
Explanation:Here is no explanation for this answer
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38 / 224
How many primary partitions can be created?
A1
B2
C3
D4
Answer: Option C
Explanation:Here is no explanation for this answer
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39 / 224
Reference bit is used for
AImplementing LRU page replacement algorithm
BImplementing NRU algorithm
CTo check the page table entry in the cache memory
DNone of Above
Answer: Option B
Explanation:Here is no explanation for this answer
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40 / 224
Which of the following is not a system file?
APacket switching
B.com
C.ini
Dnone
Answer: Option C
Explanation:Here is no explanation for this answer
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