Operating System MCQs with Answers
Practice important Operating System MCQs with answers and explanations.
Multiple Choice Questions
Q1201: What is the inode in UNIX?
- A: A data structure that contains file attributes
- B: An algorithm for file allocation
- C: A permission for executing a file
- D: A file descriptor
View Answer
B
Q1202: What does the umask command do?
- A: It sets permissions for an existing file
- B: It displays the current mask value
- C: It sets the default permissions for newly created files
- D: It lists files in a directory
View Answer
C
Q1203: Which method of file space allocation requires each file to occupy contiguous blocks on the disk?
- A: Contiguous allocation
- B: Linked allocation
- C: Indexed allocation
- D: Direct allocation
View Answer
A
Q1204: Which of the following is a disadvantage of contiguous file allocation?
- A: External fragmentation
- B: Slow access to files
- C: No random access
- D: High overhead
View Answer
A
Q1205: Which space allocation method does not suffer from external fragmentation?
- A: Contiguous allocation
- B: Linked allocation
- C: Indexed allocation
- D: Direct allocation
View Answer
B
Q1206: What does the file control block (FCB) store in UNIX?
- A: File's contents
- B: File's permissions
- C: File's inode and other attributes
- D: File's name and location
View Answer
C
Q1207: Which of the following commands displays permissions for all files and directories in your home directory?
- A: ls –l ~
- B: ls –ld ~
- C: chmod 755 ~
- D: chmod 700 ~
View Answer
A
Q1208: In the chmod 761 game1 command, what permission is granted to the group?
- A: Read and write only
- B: Execute only
- C: Read, write, and execute
- D: Read only
View Answer
B
Q1209: What is a major disadvantage of linked allocation?
- A: External fragmentation
- B: No support for sequential access
- C: Slow file growth
- D: Inefficient for random access files
View Answer
D
Q1210: Which allocation method is more efficient for supporting direct access to a file?
- A: Contiguous allocation
- B: Linked allocation
- C: Indexed allocation
- D: None of the above
View Answer
C