Memory Management Questions

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91.

The segment base contains the ____________

A

starting logical address of the process

B

starting physical address of the segment in memory

C

segment length

D

none of the mentioned

Correct Answer: B

None.

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92.

The segment limit contains the ____________

A

starting logical address of the process

B

starting physical address of the segment in memory

C

segment length

D

none of the mentioned

Correct Answer: C

None.

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93.

The offset

A

greater than segment limit

B

between 0 and segment limit

C

between 0 and the segment number

D

greater than the segment number

Correct Answer: B

None.

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94.

If the offset is legal ____________

A

it is used as a physical memory address itself

B

it is subtracted from the segment base to produce the physical memory address

C

it is added to the segment base to produce the physical memory address

D

none of the mentioned

Correct Answer: A

None.

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95.

When the entries in the segment tables of two different processes point to the same physical location ____________

A

the segments are invalid

B

the processes get blocked

C

segments are shared

D

all of the mentioned

Correct Answer: C

None.

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96.

The protection bit is 0/1 based on ____________

A

write only

B

read only

C

read-write

D

none of the mentioned

Correct Answer: C

None.

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97.

If there are 32 segments, each of size 1Kb, then the logical address should have ____________

A

13 bits

B

14 bits

C

15 bits

D

16 bits

Correct Answer: A

To specify a particular segment, 5 bits are required. To select a particular byte after selecting a page, 10 more bits are required. Hence 15 bits are required.

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98.

Consider a computer with 8 Mbytes of main memory and a 128K cache. The cache block size is 4 K. It uses a direct mapping scheme for cache management. How many different main memory blocks can map onto a given physical cache block?

A

2048

B

256

C

64

D

8

Correct Answer: C

None.

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99.

A multilevel page table is preferred in comparison to a single level page table for translating virtual address to physical address because ____________

A

it reduces the memory access time to read or write a memory location

B

it helps to reduce the size of page table needed to implement the virtual address space of a process

C

it is required by the translation lookaside buffer

D

it helps to reduce the number of page faults in page replacement algorithms

Correct Answer: B

None.

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100.

Memory management units ____________

A

increase the cost of the system

B

increase the power consumption of the system

C

increase the time required to complete an operation

D

all of the mentioned

Correct Answer: D

None.

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