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Frequently Asked Operating System interview questions and answers for freshers Page 6

(#M40029504) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. Brief about the directory representation in UNIX.

A. A Unix directory is a file containing a correspondence between filenames and inodes. A directory is a special file that the kernel maintains. Only kernel modifies directories, but processes can read directories. The contents of a directory are a list of filename and inode number pairs. When new directories are created, kernel makes two entries named '.' (refers to the directory itself) and '..' (refers to parent directory).
System call for creating directory is mkdir (pathname, mode).

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(#M40029502) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. How are devices represented in UNIX?

A. All devices are represented by files called special files that are located in/dev directory. Thus, device files and other files are named and accessed in the same way. A 'regular file' is just an ordinary data file in the disk. A 'block special file' represents a device with characteristics similar to a disk (data transfer in terms of blocks). A 'character special file' represents a device with characteristics similar to a keyboard (data transfer is by stream of bits in sequential order).

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(#M40029497) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. When does the condition 'rendezvous' arise?

A. In message passing, it is the condition in which, both, the sender and receiver are blocked until the message is delivered.

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(#M40029495) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is FtDisk?

A. It is a fault tolerance disk driver for Windows NT.

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(#M40029494) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is an idle thread?

A. The special thread a dispatcher will execute when no ready thread is found.

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(#M40029493) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is SCSI?

A. SCSI - Small computer systems interface is a type of interface used for computer components such as hard drives, optical drives, scanners and tape drives. It is a competing technology to standard IDE (Integrated Drive Electronics).

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(#M40029492) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. Explain the concept of the batched operating systems?

A. In batched operating system the users gives their jobs to the operator who sorts the programs according to their requirements and executes them. This is time consuming but makes the CPU busy all the time

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(#M40029491) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What are local and global page replacements?

A. Local replacement means that an incoming page is brought in only to the relevant process' address
space. Global replacement policy allows any page frame from any process to be replaced. The latter
is applicable to variable partitions model only.

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(#M40029490) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is DRAM?

A. Dynamic Ram stores the data in the form of Capacitance, and Static RAM stores the data in Voltages.

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(#M40029487) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is relative path and absolute path?

A. Absolute path-- Exact path from root directory.
Relative path-- Relative to the current path.

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