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Welcome to the Operating System MCQs Page

Dive deep into the fascinating world of Operating System with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Operating System, a crucial aspect of UGC CBSE NET Exam. In this section, you will encounter a diverse range of MCQs that cover various aspects of Operating System, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within UGC CBSE NET Exam.

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Check out the MCQs below to embark on an enriching journey through Operating System. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of UGC CBSE NET Exam.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Operating System. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Operating System MCQs | Page 18 of 21

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Q171.
When a process is accessing shared modifiable data, the process is said to be in:

a.

Dead lock

b.

Critical Section

c.

Multitasking

d.

Context Switching

Discuss
Answer: (b).Critical Section
Q172.
The first MPI function call made by every MPI process is the call to:

a.

MPI_Main()

b.

MPI_Wtick()

c.

MPI_Init()

d.

MPI_Bcast()

Discuss
Answer: (c).MPI_Init()
Q173.
Dijkstra’s Banker’s algorithm is used for:

a.

Deadlock Prevention

b.

Deadlock Detection

c.

Deadlock Recovery

d.

Deadlock Avoidance

Discuss
Answer: (d).Deadlock Avoidance
Q174.
Memory bank experiencing too much contention from processor:

a.

Fan-in

b.

Hot-spot

c.

Thrash

d.

Fan-out

Discuss
Answer: (c).Thrash
Q175.
Consider a disk pack with 32 surfaces, 64 tracks and 512 sectors per pack. 256 bytes of data are stored in a bit serial manner in a sector. The number of bits required to specify a particular sector in the disk is

a.

18

b.

19

c.

20

d.

22

Discuss
Answer: (c).20
Q176.
Consider a system with 2 level cache. Access times of Level 1 cache, Level 2 cache and main memory are 0.5 ns, 5 ns and 100 ns respectively. The hit rates of Level 1 and Level 2 caches are 0.7 and 0.8 respectively. What is the average access time of the system ignoring the search time within the cache?

a.

35.20 ns

b.

7.55 ns

c.

20.75 ns

d.

24.35 ns

Discuss
Answer: (b).7.55 ns
Q177.
To overcome difficulties in Readers-Writers problem, which of the following statement/s is/are true?

(i) Writers are given exclusive access to shared objects
(ii) Readers are given exclusive access to shared objects
(iii) Both Readers and Writers are given exclusive access to shared objects

a.

(i) only

b.

(ii) only

c.

(iii) only

d.

Both (ii) and (iii)

Discuss
Answer: (a).(i) only
Q178.
Suppose a system has 12 instances of some resource with n processes competing for that resource. Each process may require 4 instances of the resource. The maximum value of n for which the system never enters into deadlock is

a.

3

b.

4

c.

5

d.

6

Discuss
Answer: (a).3
Q179.
Dirty bit is used to show the

a.

wrong page

b.

page with corrupted data

c.

page with low frequency occurrence

d.

page that is modified after being loaded into cache memory

Discuss
Answer: (d).page that is modified after being loaded into cache memory
Q180.
Suppose for a process P, reference to pages in order are 1,2,4,5,2,1,2,4. Assume that main memory can accommodate 3 pages and the main memory has already 1 and 2 in the order 1 – first, 2 – second. At this moment, assume FIFO Page Replacement Algorithm is used then the number of page faults that occur to complete the execution of process P is

a.

4

b.

3

c.

5

d.

6

Discuss
Answer: (c).5
Page 18 of 21

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