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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 14 of 21

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Q131.
Four jobs J1, J2, J3 and J4 are waiting to be run. Their expected run times are 9, 6, 3 and 5 respectively. In order to minimize average response time, the jobs should be run in the order:

a.

J1 J2 J3 J4

b.

J4 J3 J2 J1

c.

J3 J4 J1 J2

d.

J3 J4 J2 J1

Discuss
Answer: (d).J3 J4 J2 J1
Q132.
Suppose it takes 100 ns to access page table and 20 ns to access associative memory. If the average access time is 28 ns, the corresponding hit rate is:

a.

100 percent

b.

90 percent

c.

80 percent

d.

70 percent

Discuss
Answer: (b).90 percent
Q133.
N processes are waiting for I/O. A process spends a fraction p of its time in I/O wait state. The CPU utilization is given by:

a.

1 - p^-N

b.

1 - p^N

c.

p^N

d.

p^-N

Discuss
Answer: (b).1 - p^N
Q134.
If holes are half as large as processes, the fraction of memory wasted in holes is:

a.

2/3

b.

1/2

c.

1/3

d.

1/5

Discuss
Answer: (d).1/5
Q135.
An example of a non pre-emptive scheduling algorithm is:

a.

Round Robin

b.

Priority Scheduling

c.

Shortest job first

d.

2 level scheduling

Discuss
Answer: (c).Shortest job first
Q136.
An example of distributed OS is:

a.

Amoeba

b.

UNIX

c.

MS-DOS

d.

MULTICS

Discuss
Answer: (a).Amoeba
Q137.
In which of the following, ready to execute processes must be present in RAM?

a.

multiprocessing

b.

multiprogramming

c.

multitasking

d.

all of the above

Discuss
Answer: (d).all of the above
Q138.
If the executing program size is greater than the existing RAM of a computer, it is still possible to execute the program if the OS supports:

a.

multitasking

b.

virtual memory

c.

paging system

d.

none of the above

Discuss
Answer: (b).virtual memory
Q139.
Files that are related to input/output and are used to model serial I/O devices such as terminals, printers and networks are called :

a.

regular files

b.

character special files

c.

directories

d.

block special files

Discuss
Answer: (d).block special files
Q140.
An example of a possible file attribute is:

a.

minimum size

b.

permanent flag

c.

archive flag

d.

EBCDIC flag

Discuss
Answer: (c).archive flag
Page 14 of 21

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