PPSC Past Papers MCQs

PPSC Lecturer Computer Science IT Higher Education Department Punjab 2017 — 98 MCQs (Page 2 of 10)

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A process refers to 5 pages A, B, C, D, E in the order A, B, C, D, A, B, E, A, B, C, D, E. If the page replacement algorithm is FIFO, the number of page transfers with Internal store of 3 frames is?

A. 8
B. 10
C. 9
D. 7

A memory page containing a heavily used variable that was initialized very early and is in constant use is removed and then the page replacement algorithm used is?

A. Lru
B. Lfu
C. Fifo
D. None of these

Users are ……. that their processes are running on a paged system?

A. Aware
B. Unaware
C. Informed
D. None of these

The aim of creating page replacement algorithms is to?

A. Replace pages faster
B. Increase the page fault rate
C. Decrease the pay, fault rate
D. To allocate multiple pages to processes

A FIFO replacement algorithm associates with each page the?

A. Time it was brought into memory
B. Size of the page in memory
C. Page after and before it
D. All of these

Optimal page …….. replacement algorithm?

A. Replace the page that has not been used for a long lime
B. Replace the page that has been used for a long time
C. Replace the page-that will not be used for a long time
D. None of these

The optimal page-replacement algorithm is difficult to implement, because?

A. It requires a lot of information
B. It requires future knowledge of the reference string
C. It is too complex
D. It is extremely expensive

LRU page – replacement algorithm associates with each page the …….?

A. Time it was brought into memory
B. The time of that pages last use
C. Page after and before it
D. All of these

For 3-page frames, the following is the reference string: 7 0 1 2 0 3 0 4 2 3 0 3 2 1 2 0 1 7 0 1; How many page faults does the LRU page replacement algorithm produce?

A. 10
B. 15
C. 11
D. 12

CPU fetches the instruction from memory according to the value of?

A. Program counter
B. Status register
C. Instruction register
D. Program status word

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