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Frequently Asked Operating System interview questions and answers for freshers Page 2

(#M40018998) OPERATING SYSTEM QUESTION Operating System Questions Keep an EYE

Which is the best page replacement algorithm and Why? How much time is spent usually in
each phases and why?

Asked In Operating System (12 years ago)

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(#M40152806) OPERATING SYSTEM QUESTION Keep an EYE

No. of pages are given and using LRU algorithm we have to find the number of page faults.
a) 2 b) 6 c) 5 d)7

Asked In Operating System Nakshatra Mukhopadhyay (10 years ago)

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(#M40029488) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What are the disadvantages of context switching?

A. Time taken for switching from one process to other is pure over head. Because the system does no
useful work while switching. So one of the solutions is to go for threading when ever possible.

Asked In Operating System MAN (12 years ago)

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(#M40029489) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is a data register and address register?

A. Data registers - can be assigned to a variety of functions by the programmer. They can be used with
any machine instruction that performs operations on data.
Address registers - contain main memory addresses of data and instructions or they contain a portion
of the address that is used in the calculation of the complete addresses.

Asked In Operating System MAN (12 years ago)

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(#M40029447) OPERATING SYSTEM QUESTION operating system Keep an EYE

what is user?

Asked In Operating System MAN (12 years ago)

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(#M40018990) OPERATING SYSTEM QUESTION Operating System Questions Keep an EYE

What is the state of the processor,
when a process is waiting for some event to occur?

Asked In Operating System (12 years ago)

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(#M40029483) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What are residence monitors?

A. Early operating systems were called residence monitors.

Asked In Operating System MAN (12 years ago)

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(#M40029478) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is page cannibalizing?

A. Page swapping or page replacements are called page cannibalizing.

Asked In Operating System MAN (12 years ago)

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(#M40029467) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is a trap and trapdoor?

A. Trapdoor is a secret undocumented entry point into a program used to grant access without normal methods of access authentication. A trap is a software interrupt, usually the result of an error condition

Asked In Operating System MAN (12 years ago)

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(#M40029464) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is Throughput, Turnaround time, waiting time and Response time?

A. Throughput - number of processes that complete their execution per time unit Turnaround time - amount of time to execute a particular process Waiting time - amount of time a process has been waiting in the ready queue Response time - amount of time it takes from when a request was submitted until the first response is produced, not output (for time-sharing environment)

Asked In Operating System MAN (12 years ago)

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