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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 8 of 16

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Q71.
Consider a disk pack with 16 surfaces, 128 tracks per surface and 256 sectors per track. 512 bytes of data are stored in a bit serial manner in a sector. The capacity of the disk pack and the number of bits required to specify a particular sector in the disk are respectively:

a.

256 Mbyte, 19 bits

b.

256 Mbyte, 28 bits

c.

512 Mbyte, 20 bits

d.

64 Gbyte, 28 bit

Discuss
Answer: (a).256 Mbyte, 19 bits
Q72.
Suppose a disk has 201 cylinders, numbered from 0 to 200. At some time the disk arm is at cylinder 100, and there is a queue of disk access requests for cylinders 30, 85, 90, 100, 105, 110, 135 and 145. If Shortest-Seek Time First (SSTF) is being used for scheduling the disk access, the request for cylinder 90 is serviced after servicing ____________ number of requests.

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (c).3
Q73.
A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overhead be 4 msec. The byte transfer time between the device interface register and CPU or memory is negligible. What is the minimum performance gain of operating the device under interrupt mode over operating it under program controlled mode?

a.

15

b.

25

c.

35

d.

45

Discuss
Answer: (b).25
Q74.
Consider a disk drive with the following specifications: 16 surfaces, 512 tracks/surface, 512 sectors/track, 1 KB/sector, rotation speed 3000 rpm. The disk is operated in cycle stealing mode whereby whenever one byte word is ready it is sent to memory; similarly, for writing, the disk interface reads a 4 byte word from the memory in each DMA cycle. Memory cycle time is 40 nsec. The maximum percentage of time that the CPU gets blocked during DMA operation is:

a.

10

b.

25

c.

40

d.

50

Discuss
Answer: (b).25
Q75.
Consider an operating system capable of loading and executing a single sequential user process at a time. The disk head scheduling algorithm used is First Come First Served (FCFS). If FCFS is replaced by Shortest Seek Time First (SSTF), claimed by the vendor to give 50% better benchmark results, what is the expected improvement in the I/O performance of user programs?

a.

50%

b.

40%

c.

25%

d.

0%

Discuss
Answer: (d).0%
Q76.
A Unix-style i-node has 10 direct pointers and one single, one double and one triple indirect pointers. Disk block size is 1 Kbyte, disk block address is 32 bits, and 48-bit integers are used. What is the maximum possible file size ?

a.

2^24 bytes

b.

2^32 bytes

c.

2^34 bytes

d.

2^48 bytes

Discuss
Answer: (c).2^34 bytes
Q77.
A hard disk with a transfer rate of 10 Mbytes/ second is constantly transferring data to memory using DMA. The processor runs at 600 MHz, and takes 300 and 900 clock cycles to initiate and complete DMA transfer respectively. If the size of the transfer is 20 Kbytes, what is the percentage of processor time consumed for the transfer operation ?

a.

5.0%

b.

1.0%

c.

0.5%

d.

0.1%

Discuss
Answer: (d).0.1%
Q78.
Using a larger block size in a fixed block size file system leads to :

a.

better disk throughput but poorer disk space utilization

b.

better disk throughput and better disk space utilization

c.

poorer disk throughput but better disk space utilization

d.

poorer disk throughput and poorer disk space utilization

Discuss
Answer: (a).better disk throughput but poorer disk space utilization
Q79.
Which of the following requires a device driver?

a.

Register

b.

Cache

c.

Main memory

d.

Disk

Discuss
Answer: (d).Disk
Q80.
A graphics card has on board memory of 1 MB. Which of the following modes can the card not support?

a.

1600 x 400 resolution with 256 colours on a 17-inch monitor

b.

1600 x 400 resolution with 16 million colours on a 14-inch monitor

c.

800 x 400 resolution with 16 million colours on a 17-inch monitor

d.

800 x 800 resolution with 256 colours on a 14-inch monitor

Discuss
Answer: (b).1600 x 400 resolution with 16 million colours on a 14-inch monitor
Page 8 of 16

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