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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 GATE CSE 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 GATE CSE 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 GATE CSE 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 7 of 16

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Q61.
Which of the following disk scheduling policies results in minimum amount of head movement.

a.

FCS

b.

Circular scan

c.

Elevator

d.

None of the above

Discuss
Answer: (b).Circular scan
Q62.
Consider a hard disk with 16 recording surfaces (0-15) having 16384 cylinders (0-16383) and each cylinder contains 64 sectors (0-63). Data storage capacity in each sector is 512 bytes. Data are organized cylinder-wise and the addressing format is (cylinder no., surface no., sector no.) . A file of size 42797 KB is stored in the disk and the starting disk location of the file is (1200, 9, 40). What is the cylinder number of the last sector of the file, if it is stored in a contiguous manner?

a.

1281

b.

1282

c.

1283

d.

1284

Discuss
Answer: (d).1284
Q63.
A file system with 300 GByte disk uses a file descriptor with 8 direct block addresses, 1 indirect block address and 1 doubly indirect block address. The size of each disk block is 128 Bytes and the size of each disk block address is 8 Bytes. The maximum possible file size in this file system is

a.

3 Kbytes

b.

35 Kbytes

c.

280 Bytes

d.

Dependent on the size of the disk

Discuss
Answer: (b).35 Kbytes
Q64.
A computer handles several interrupt sources of which the following are relevant for this question.

. Interrupt from CPU temperature sensor (raises interrupt if
CPU temperature is too high)
. Interrupt from Mouse(raises interrupt if the mouse is moved
or a button is pressed)
. Interrupt from Keyboard(raises interrupt when a key is
pressed or released)
. Interrupt from Hard Disk(raises interrupt when a disk
read is completed)

Which one of these will be handled at the HIGHEST priority?

a.

Interrupt from Hard Disk

b.

Interrupt from Mouse

c.

Interrupt from Keyboard

d.

Interrupt from CPU temperature sensor

Discuss
Answer: (d).Interrupt from CPU temperature sensor
Q65.
An application loads 100 libraries at start-up. Loading each library requires exactly one disk access. The seek time of the disk to a random location is given as 10 ms. Rotational speed of disk is 6000 rpm. If all 100 libraries are loaded from random locations on the disk, how long does it take to load all libraries? (The time to transfer data from the disk block once the head has been positioned at the start of the block may be neglected)

a.

0.50 s

b.

1.50 s

c.

1.25 s

d.

1.00 s

Discuss
Answer: (b).1.50 s
Q66.
A CPU generally handles an interrupt by executing an interrupt service routine

a.

As soon as an interrupt is raised

b.

By checking the interrupt register at the end of fetch cycle

c.

By checking the interrupt register after finishing the execution of the current instruction

d.

By checking the interrupt register at fixed time intervals

Discuss
Answer: (c).By checking the interrupt register after finishing the execution of the current instruction
Q67.
A hard disk has 63 sectors per track, 10 platters each with 2 recording surfaces and 1000 cylinders. The address of a sector is given as a triple (c, h, s), where c is the cylinder number, h is the surface number and s is the sector number. Thus, the 0th sector is addressed as (0, 0, 0), the 1st sector as (0, 0, 1), and so on The address (400,16,29) corresponds to sector number:

a.

505035

b.

505036

c.

505037

d.

505038

Discuss
Answer: (c).505037
Q68.
The data blocks of a very large file in the Unix file system are allocated using

a.

contiguous allocation

b.

linked allocation

c.

indexed allocation

d.

an extension of indexed allocation

Discuss
Answer: (d).an extension of indexed allocation
Q69.
For a magnetic disk with concentric circular tracks, the seek latency is not linearly proportional to the seek distance due to

a.

non-uniform distribution of requests

b.

arm starting and stopping inertia

c.

higher capacity of tracks on the periphery of the platter

d.

use of unfair arm scheduling policies

Discuss
Answer: (b).arm starting and stopping inertia
Q70.
Which of the following statements about synchronous and asynchronous I/O is NOT true?

a.

An ISR is invoked on completion of I/O in synchronous I/O but not in asynchronous I/O

b.

In both synchronous and asynchronous I/O, an ISR (Interrupt Service Routine) is invoked after completion of the I/O

c.

A process making a synchronous I/O call waits until I/O is complete, but a process making an asynchronous I/O call does not wait for completion of the I/O

d.

In the case of synchronous I/O, the process waiting for the completion of I/O is woken up by the ISR that is invoked after the completion of I/O

Discuss
Answer: (a).An ISR is invoked on completion of I/O in synchronous I/O but not in asynchronous I/O
Page 7 of 16

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