Operating Systems Questions

Q:

What is the resident set and working set of a process?

Answer

Resident set is that portion of the process image that is actually in real-memory at a particular instant. Working set is that subset of resident set that is actually needed for execution. (Relate this to the variable-window size method for swapping techniques.)

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Q:

The PS command prints the process status for only some of the running processes.

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

Explanation:

The PS command prints the process status for some or all of the running processes

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Subject: Operating Systems
Exam Prep: GATE

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Q:

What is busy waiting?

Answer

The repeated execution of a loop of code while waiting for an event to occur is called busy-waiting. The CPU is not engaged in any real productive activity during this period, and the process does not progress toward completion.

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Q:

What is process spawning?

Answer

When the OS at the explicit request of another process creates a process, this action is called process spawning.

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Q:

What type of operating system uses the NTFS file system ?

A) Windows B) Mac OS X
C) Unix D) All of these
 
Answer & Explanation Answer: A) Windows

Explanation:

Windows operating system uses the NTFS file system.

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Filed Under: Operating Systems
Exam Prep: Bank Exams

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Q:

Explain soundex() and metaphone() ?

Answer

soundex()
The soundex() function calculates the soundex key of a string. A soundex key is a four character long alphanumeric string that represent English pronunciation of a word. he soundex() function can be used for spelling applications.
< ?php
$str = "hello";
echo soundex($str);
? >


metaphone()
The metaphone() function calculates the metaphone key of a string. A metaphone key represents how a string sounds if said by an English speaking person. The metaphone() function can be used for spelling applications.
< ?php
echo metaphone("world");
? >

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Q:

Default read write and execute permissions given to a file for owner, group and others are

A) 6-4-4 B) 6-4-2
C) 6-4-6 D) 6-6-6
 
Answer & Explanation Answer: A) 6-4-4

Explanation:

Default permissions given to a file are:

Owner - read write and execute - 6

group - write - 4

others - write - 4

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Q:

What is the difference between Hard and Soft real-time systems?

Answer

A hard real-time system guarantees that critical tasks complete on time. This goal requires that all delays in the system be bounded from the retrieval of the stored data to the time that it takes the operating system to finish any request made of it. A soft real time system where a critical real-time task gets priority over other tasks and retains that priority until it completes. As in hard real time systems kernel delays need to be bounded

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