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System calls, Processes, Threads, Inter‐process communication, Concurrency and synchronization. Deadlock. CPU scheduling. Memory management and Virtual memory. File systems. Disks is also under this

$$\scriptsize{\overset{{\large{\textbf{Mark Distribution in Previous GATE}}}}{\begin{array}{|c|c|c|c|c|c|c|c|}\hline
\textbf{Year}& \textbf{2022} & \textbf{2021-1}&\textbf{2021-2}&\textbf{2020}&\textbf{2019}&\textbf{2018}&\textbf{2017-1}&\textbf{2017-2}&\textbf{2016-1}&\textbf{2016-2}&\textbf{Minimum}&\textbf{Average}&\textbf{Maximum}
\\\hline\textbf{1 Mark Count} & 2 &4&2&2&2&3&2&2&1&1&1&2.1&4
\\\hline\textbf{2 Marks Count} & 4 &1&3&4&4&3&2&2&4&3&1&3&4
\\\hline\textbf{Total Marks} & 10 &6&8&10&10&9&6&6&9&7&\bf{6}&\bf{8.1}&\bf{10}\\\hline
\end{array}}}$$

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Previous GATE Questions in Operating System

61 votes
6 answers
154
GATE CSE 2010 | Question: 45
The following program consists of $3$ concurrent processes and $3$ binary semaphores. The semaphores are initialized as $S0=1, S1=0$ and $S2=0.$ ... $P0$ print '$0$'? At least twice Exactly twice Exactly thrice Exactly once
The following program consists of $3$ concurrent processes and $3$ binary semaphores. The semaphores are initialized as $S0=1, S1=0$ and $S2=0.$$$\begin{array}{|l|l|}\hli...
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25 votes
4 answers
155
GATE CSE 1993 | Question: 22
Write a concurrent program using $\text{parbegin-parend}$ and semaphores to represent the precedence constraints of the statements $S_1$ to $S_6$, as shown in figure below.
Write a concurrent program using $\text{parbegin-parend}$ and semaphores to represent the precedence constraints of the statements $S_1$ to $S_6$, as shown in figure belo...
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28 votes
3 answers
157
GATE CSE 1993 | Question: 7.10
Assume that the following jobs are to be executed on a single processor system ... time (completion time) for job $p$ if scheduling is round robin with time slice $1$ $4$ $10$ $11$ $12$ None of the above
Assume that the following jobs are to be executed on a single processor system$$\begin{array}{|c|c|} \hline \textbf{Job Id} & \textbf{CPU Burst Time} \\\hline \text{p} ...
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32 votes
2 answers
159
GATE CSE 1993 | Question: 7.8
The root directory of a disk should be placed at a fixed address in main memory at a fixed location on the disk anywhere on the disk at a fixed location on the system disk anywhere on the system disk
The root directory of a disk should be placedat a fixed address in main memoryat a fixed location on the diskanywhere on the diskat a fixed location on the system diskany...
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28 votes
4 answers
160
GATE CSE 1993 | Question: 6.8
The details of an interrupt cycle are shown in figure. Given that an interrupt input arrives every $1$ msec, what is the percentage of the total time that the CPU devotes for the main program execution.
The details of an interrupt cycle are shown in figure.Given that an interrupt input arrives every $1$ msec, what is the percentage of the total time that the CPU devote...
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25 votes
6 answers
163
GATE CSE 1997 | Question: 6.7
An operating system contains $3$ user processes each requiring $2$ units of resource $R$. The minimum number of units of $R$ such that no deadlocks will ever arise is $3$ $5$ $4$ $6$
An operating system contains $3$ user processes each requiring $2$ units of resource $R$. The minimum number of units of $R$ such that no deadlocks will ever arise is$3$$...
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34 votes
3 answers
164
GATE CSE 1997 | Question: 3.10, ISRO2008-57, ISRO2015-64
Dirty bit for a page in a page table helps avoid unnecessary writes on a paging device helps maintain LRU information allows only read on a page None of the above
Dirty bit for a page in a page tablehelps avoid unnecessary writes on a paging devicehelps maintain LRU informationallows only read on a pageNone of the above
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32 votes
4 answers
165
GATE CSE 1997 | Question: 3.9
Thrashing reduces page I/O decreases the degree of multiprogramming implies excessive page I/O improve the system performance
Thrashingreduces page I/Odecreases the degree of multiprogrammingimplies excessive page I/Oimprove the system performance
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32 votes
2 answers
167
GATE CSE 1997 | Question: 3.7
I/O redirection implies changing the name of a file can be employed to use an existing file as input file for a program implies connecting $2$ programs through a pipe None of the above
I/O redirectionimplies changing the name of a filecan be employed to use an existing file as input file for a programimplies connecting $2$ programs through a pipeNone of...
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24 votes
3 answers
168
GATE CSE 1997 | Question: 3.6
The correct matching for the following pairs is: ... $\text{A-4 B-3 C-2 D-1}$ $\text{A-2 B-4 C-1 D-3}$ $\text{A-3 B-4 C-3 D-2}$
The correct matching for the following pairs is:$$\small \begin{array}{cl|cl}\hline \text{(A)} &\text{Disk Scheduling} & \text{(1)} &\text{Round robin} \\\hline \text{...
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