AMU MCA Operating System Previous Year Questions (PYQs) – Page 2 of 3
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Showing 22 questions
Initial value of the semaphore is to allow only one of the many processes to enter their critical section is:
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Solution
To allow only one process in the critical section, a binary semaphore is used with initial value $1$.
How does the software trigger an interrupt?
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Solution
Software interrupt is generated by executing a system call instruction.
Which of the following system call is used to create new process in UNIX operating system?
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Solution
fork() creates a new child process in UNIX.
What is the name of storage device which is used to compensate for the difference in rates of flow of data from one device to another?
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Solution
A buffer temporarily stores data to handle speed mismatch between devices.
The first operating system of Micro-processor is …………
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Solution
The first widely used OS for microprocessors was CP/M (Control Program for Microcomputers).
The time interval from the time of submission of a process to the time of completion is:
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Solution
Turnaround time = Completion time − Arrival time.
What are two types of semaphores?
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Solution
Semaphores are classified into Counting and Binary semaphores.
Which statement is true about process 0 in the Unix operating system?
I. Process 0 is called init process.
II. Process 0 is not created by fork system call.
III. After forking process 1, process 0 becomes swapper process.
IV. Process 0 is a special process created when system boots.
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Solution
Process 0 is created at boot, not by fork, becomes swapper, and is special.
Init is process 1, not process 0.
The criteria for calculation of priority of a process are:
(A) Weight assigned to the group of user
(B) Processor utilization by an individual process
(C) Processor utilization by a user as group of process (priority calculated in fair scheduler)
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Solution
All listed factors are considered in fair scheduling.
A front-end processor is usually used in
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Solution
Front-end processors are mainly used for I/O handling in time-sharing systems.
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