ITI9137 Week 2

Select all options that are major functions of an operating system

• File Management

• Memory Management

• Process Management

• Email Management

Select all entries that are part of the /etc/passwd file

• Group ID (GID)

• Home directory

• Command/shell

• User ID (UID)

In OS, the kernel does not identify files by their names. Instead, it uses a unique number to identify each file. What is this number called?

• inode

• xnode

• xnumber

• ufile

Which of the following is not part of the three levels of file permissions in Unix?

• Owner

• Group

• Others

• Admin

Which command grants all permissions to the owner, read and execute access to the group, and read access to others?

• chmod 755 filename

• chmod 754 filename

• chmod 741 filename

• chmod 765 filename

Which of the following is correct regarding directory permissions in Unix?

• Read permission allows users to modify the contents of files in the directory

• Execute permission on a directory allows users to list the names and subdirectories within it

• Write permission on a directory allows users to create and remove files but not modify contents

• Execute permission is not required for navigating directories using the cd command

What are the solutions to handle multi-processing (multiple processes in memory at the same time)?

• Swapping

• Virtual Memory

• Batch Processing

• Disk Caching

What is the difference between external fragmentation and internal fragmentation?

• External is unused allocated memory, Internal is unused unallocated memory

• External is scattered unused memory, Internal is unused allocated memory

• Both are caused by memory allocation to processes

• External is contiguous unused memory, Internal is scattered unused memory

Which of the following is true about paging in memory management?

• Pages and Frames have different sizes

• The page-table translates frames to corresponding pages at runtime

• Pages are loaded into memory only when needed

• Pages and frames are kept in memory at all times, regardless of program need

Which of the following describes the CORRECT page fault and page replacement process in memory management?

• A page fault occurs when a page is already in memory, triggering a replacement process

• The page table indicates if a page is in memory using a "valid/invalid" bit

• Page swapping happens when there is space available in memory for a new page

• If a page is modified before eviction, it is not written to disk