1. What is the purpose of the 'chmod' command in Unix-like systems?
 a) To change the computer's time and date
 b) To change file permissions
 c) To create a new user account
 d) To check disk space usage

2. Which of the following is not a memory management unit in the CPU?
 a) CPU cache
 b) TLB (Translation Lookaside Buffer)
 c) RAM (Random Access Memory)
 d) Virtual memory

3. What is the main advantage of using multi-threading in an operating system?
 a) Improved security
 b) Better memory management
 c) Enhanced parallelism and responsiveness
 d) Faster disk access

4. Which file in Linux contains information about user accounts and their properties?
 a) /etc/passwd
 b) /etc/group
 c) /etc/shadow
 d) /etc/hostname

5. What is a device driver in the context of an operating system?
 a) A program that controls hardware devices
 b) A printer utility program
 c) A program for managing disk drives
 d) A program for managing network connections

6. What is the purpose of the 'df' command in Unix-like operating systems?
 a) To display a list of currently running processes
 b) To list all files in a directory
 c) To check disk space usag

 d) To create a new directory

7. Which file system is commonly used in Windows operating systems?
 a) ext4
 b) NTFS
 c) FAT32
 d) HFS+

8. What is a kernel in an operating system?
 a) The user interface of the operating system
 b) The central component responsible for managing resources and executing processes
 c) A type of file system
 d) A type of hardware device

9. What is a semaphore in operating systems?
 a) A type of malware
 b) A mechanism for interprocess communication
 c) A hardware component
 d) A type of file system

10. Which file system is commonly used in macOS?
 a) NTFS
 b) FAT32
 c) ext4
 d) HFS+