Operating Systems problems
- 1. A UNIX user named Bob wants to replace his chess program with a new one, but he is not sure where the old one is installed. Bob is currently able to run a Java chess program starting from his home directory /home/bob using the command: java -classpath /test:/home/bob/downloads/*.jar games.Chess Bob's CLASSPATH is set (at login time) to: /usr/lib:/home/bob/classes:/opt/java/lib:/opt/java/lib/*.jar What is a possible location for the Chess.class file?
Options- A. /test/Chess.class
- B. /home/bob/Chess.class
- C. /test/games/Chess.class
- D. /user/lib/games/Chess.class Discuss
Correct Answer: /user/lib/games/Chess.class
Explanation:
/user/lib/games/Chess.class could be the possible location of the file
- 2. Default read write and execute permissions given to a file for owner, group and others are
Options- A. 6-4-4
- B. 6-4-2
- C. 6-4-6
- D. 6-6-6 Also asked in: Database Administrator
Correct Answer: 6-4-4
Explanation:
Default permissions given to a file are:
Owner - read write and execute - 6
group - write - 4
others - write - 4
- 3. The list of coded instructions is called
Options- A. Algorithm
- B. Flowchart
- C. Utility programs
- D. Computer program Also asked in: GRE, TOEFL, Database Administrator, IT Trainer
Correct Answer: Computer program
Explanation:
A computer program is a collection of instructions that performs a specific task when executed by a computer
- 4. Which of the following is Not an Operating System?
Options- A. UNIX
- B. Windows NT
- C. C++
- D. DOS Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO, Database Administrator, IT Trainer, Network Engineer, Project Manager, Software Architect
Correct Answer: 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.
- 5. What type of operating system uses the NTFS file system ?
Options- A. Windows
- B. Mac OS X
- C. Unix
- D. All of these Also asked in: Bank Exams
Correct Answer: Windows
Explanation:
Windows operating system uses the NTFS file system.
- 6. Explain soundex() and metaphone() ? Also asked in: IT Trainer, Project Manager
Correct 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"); ? >
- 7. High level language is also called as ?
Options- A. Business oriented language
- B. Mathematically oriented language
- C. Problem oriented language
- D. All of above Also asked in: AIEEE, CAT, GRE, TOEFL, Bank Clerk, Bank PO, Network Engineer, Project Manager, Software Architect
Correct Answer: All of above
- 8. When is a system in safe state? Discuss
Correct Answer: 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
- 9. What are local and global page replacements? Discuss
Correct Answer: 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
- 10. What are demand-paging and pre-paging? Discuss
Correct Answer: With demand paging, a page is brought into memory only when a location on that page is actually referenced during execution With pre-paging, pages other than the one demanded by a page fault are brought in The selection of such pages is done based on common access patterns, especially for secondary memory devices
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