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Frequently Asked Operating System interview questions and answers for freshers Page 5

(#M40029508) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is a FIFO?

A. FIFO are otherwise called as 'named pipes'. FIFO (first-in-first-out) is a special file which is said to be data transient. Once data is read from named pipe, it cannot be read again. Also, data can be read only in the order written. It is used in interprocess communication where a process writes to one end of the pipe (producer) and the other reads from the other end (consumer).

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(#M40019005) OPERATING SYSTEM QUESTION Operating System Questions Keep an EYE

While running DOS on a PC, which
command would be used to duplicate the entire diskette?

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(#M40018973) OPERATING SYSTEM QUESTION Operating System Questions Keep an EYE

What are the basic functions of an
operating system?

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(#M40018977) OPERATING SYSTEM QUESTION Operating System Questions Keep an EYE

What is DRAM? In which form does it
store data?

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(#M40029500) OPERATING SYSTEM QUESTION operating system Keep an EYE

What are the sub-components of I/O manager in Windows NT?
1) Network redirector/ Server
2) Cache manager.
3) File systems
4) Network driver
5) Device driver

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(#M40018976) OPERATING SYSTEM QUESTION Operating System Questions Keep an EYE

Differentiate between RAM and ROM?

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(#M40018979) OPERATING SYSTEM QUESTION Operating System Questions Keep an EYE

What is hard disk and what is its
purpose?

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(#M40029498) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is process spawning?

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

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(#M40029506) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. How do you change File Access Permissions?

A. Every file has following attributes:
owner's user ID ( 16 bit integer )
owner's group ID ( 16 bit integer )
File access mode word
'r w x -r w x- r w x'
(user permission-group permission-others permission)
r-read, w-write, x-execute
To change the access mode, we use chmod(filename,mode).
Example 1:
To change mode of myfile to 'rw-rw-r--' (ie. read, write permission for user - read,write permission for group - only read permission for others) we give the args as:
chmod(myfile,0664) .
Each operation is represented by discrete values
'r' is 4
'w' is 2 'x' is 1
Therefore, for 'rw' the value is 6(4+2).
Example 2:
To change mode of myfile to 'rwxr--r--' we give the args as:
chmod(myfile,0744).

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(#M40029505) OPERATING SYSTEM QUESTION operating system Keep an EYE

What are the Unix system calls for I/O?

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