Operating Systems Questions

Q:

What is dual-mode operation?

Answer

In order to protect the operating systems and the system programs from the malfunctioning programs the two mode operations were evolved


System mode


User mode

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Q:

How are the wait/signal operations for monitor different from those for semaphores?

Answer

If a process in a monitor signal and no task is waiting on the condition variable, the signal is lost. So this allows easier program design. Whereas in semaphores, every operation affects the value of the semaphore, so the wait and signal operations should be perfectly balanced in the program.

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Q:

Which among the following is not aprocess state in unix?

A) Running B) Runnable
C) Zombie D) Stopped
 
Answer & Explanation Answer: B) Runnable

Explanation:

The process states of unix are running,Zombie,stopped,Waiting.

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Q:

Which of the following is Not an Operating System?

A) UNIX B) Windows NT
C) C++ D) DOS
 
Answer & Explanation Answer: C) C++

Explanation:

C++ is not an Operating System.

 

An Operating System is a collection of system programs that manages all the other programs application programs in a computer as well as the allocation and use of hardware resources such as the CPU, Memory and the Hard Disk Drive.

It acts as an interface between the hardware and the user level program.

It controls and facilitates the overall operation of a computer. 

 

Here

UNIX : UNIX is a popular multi-user, multitasking operating system (OS) developed at Bell Labs.

 

Windows NT : Windows NT is a family of operating systems produced by Microsoft, the first version of which was released in July 1993.

 

DOS : DOS is Disk Operating System. The term DOS can refer to any operating system.

 

C++ : C++ is a programming language and computing platform.

 

Hence, C++ is not an Operating System.

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Q:

Which among the following is a system call used for process management

A) fork() B) exec()
C) getppid() D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

All the above listed are the System calls for process management

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Q:

Which memory management technique involves dividing the memory into fixed sized blocks ?

A) Paging B) Scaling
C) Whiping D) Tracking
 
Answer & Explanation Answer: A) Paging

Explanation:

Paging is a memory management technique in which process address space is broken into blocks of the same size called pages.

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Q:

getppid() system call is used to bias the existing priority of a process 

A) TRUE B) FALSE
Answer & Explanation Answer: B) FALSE

Explanation:

It is used to get parent process identifier

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Q:

What is a drawback of MVT?

Answer

1) ability to support multiple processors
2) virtual storage
3) source level debugging

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