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Operating System interview questions and answers for freshers Page 5

(#M40029472) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. Explain the meaning of mutex.

A. Mutex is the short form for Mutual Exclusion object. A mutex allows multiple threads for sharing the same resource. The resource can be file. A mutex with a unique name is created at the time of starting a program. A mutex must be locked from other threads, when any thread that needs the resource. When the data is no longer used / needed, the mutex is set to unlock.

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(#M40029471) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is a long term scheduler & short term schedulers?

A. Long term schedulers are the job schedulers that select processes from the job queue and load them into memory for execution. The short term schedulers are the CPU schedulers that select a process from the ready queue and allocate the CPU to one of them.

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(#M40029470) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is cache-coherency?

A. In a multiprocessor system there exist several caches each may containing a copy of same variable A. Then a change in one cache should immediately be reflected in all other caches this process of maintaining the same value of a data in all the caches s called cache-coherency.

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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

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(#M40029468) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. When is a system in safe state?

A. The set of dispatchable processes is in a safe state if there exists at least one temporal order in which all processes can be run to completion without resulting in a deadlock.

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(#M40029469) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. Explain the concept of the Distributed systems?

A. Distributed systems work in a network. They can share the network resources, communicate with each other

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(#M40029466) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is a Real-Time System?

A. A real time process is a process that must respond to the events within a certain time period. A real time operating system is an operating system that can run real time processes successfully

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(#M40029465) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is Memory-Management Unit (MMU)?

A. Hardware device that maps virtual to physical address. In MMU scheme, the value in the relocation register is added to every address generated by a user process at the time it is sent to memory. ->The user program deals with logical addresses; it never sees the real physical addresses

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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)

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(#M40029463) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. Differentiate between Complier and Interpreter?

A. An interpreter reads one instruction at a time and carries out the actions implied by that instruction. It does not perform any translation. But a compiler translates the entire instructions

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