Memory Management Questions

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141.

What are the two methods of the LRU page replacement policy that can be implemented in hardware?

A

Counters

B

RAM & Registers

C

Stack & Counters

D

Registers

Correct Answer: C

None.

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142.

When using counters to implement LRU, we replace the page with the ____________

A

smallest time value

B

largest time value

C

greatest size

D

none of the mentioned

Correct Answer: A

Whenever a reference to a page is made, the contents of the clock register are copied into the time-of-use field in the page-table entry for that page. In this way, we always have the time of the last reference to each page.

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143.

In the stack implementation of the LRU algorithm, a stack can be maintained in a manner ____________

A

whenever a page is used, it is removed from the stack and put on bottom

B

the bottom of the stack is the LRU page

C

the top of the stack contains the LRU page and all new pages are added to the top

D

none of the mentioned

Correct Answer: B

None.

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144.

There is a set of page replacement algorithms that can never exhibit Belady

A

queue algorithms

B

stack algorithms

C

string algorithms

D

none of the mentioned

Correct Answer: B

None.

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145.

Applying the LRU page replacement to the following reference string. 1 2 4 5 2 1 2 4 The main memory can accommodate 3 pages and it already has pages 1 and 2. Page 1 came in before page 2. How many page faults will occur?

A

2

B

3

C

4

D

5

Correct Answer: C

None.

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146.

Increasing the RAM of a computer typically improves performance because ____________

A

Virtual memory increases

B

Larger RAMs are faster

C

Fewer page faults occur

D

None of the mentioned

Correct Answer: C

None.

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147.

The essential content(s) in each entry of a page table is/are ____________

A

Virtual page number

B

Page frame number

C

Both virtual page number and page frame number

D

Access right information

Correct Answer: B

None.

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148.

The minimum number of page frames that must be allocated to a running process in a virtual memory environment is determined by ____________

A

the instruction set architecture

B

page size

C

physical memory size

D

number of processes in memory

Correct Answer: A

None.

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149.

What is the reason for using the LFU page replacement algorithm?

A

an actively used page should have a large reference count

B

a less used page has more chances to be used again

C

it is extremely efficient and optimal

D

all of the mentioned

Correct Answer: A

None.

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150.

What is the reason for using the MFU page replacement algorithm?

A

an actively used page should have a large reference count

B

a less used page has more chances to be used again

C

it is extremely efficient and optimal

D

all of the mentioned

Correct Answer: B

None.

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