OPERATING_SYSYTEMS2

The two types of semaphores are-

• Counting and decimal semaphore

• Counting and binary semaphore

• Counting and mutex

• None

The main purpose of thread synchronization is to:

• Ensure that only one thread can access the resource at any given time

• Make sure that threads run at the same speed

• Prevent threads from executing

• None of the above

In the Dining Philosophers Problem, deadlock can be avoided by:

• Allowing only four philosophers to sit at the table at any time

• Requiring philosophers to pick up both forks at the same time

• Philosophers must request the waiter's permission to pick up forks

• All of the above

The Banker's algorithm is used for:

• Detecting deadlocks

• Preventing deadlocks

• Memory allocation

• Process scheduling

A critical section is:

• A section of code that can be executed by multiple threads simultaneously

• A section of code that requires mutual exclusion in access

• A section of memory allocated to the OS

• None of the above

In POSIX threads (pthreads), which function is used to initialize a mutex?

• pthread_mutex_init

• pthread_create

• pthread_mutex_lock

• pthread_join

What is the purpose of a Memory Management Unit (MMU) in a computer system?

• To enhance the CPU speed

• To manage disk storage

• To translate virtual addresses to physical addresses

• To monitor system performance

Which memory allocation method involves dividing memory into fixed-sized partitions?

• Dynamic allocation

• Segmentation

• Paging

• Fixed partitioning

Virtual memory is:

• Physical memory exclusively used by the operating system

• A section of the hard disk used as RAM

• An illusion of unlimited memory created by the OS

• A type of volatile memory

Page replacement algorithms are used for:

• Assigning processes to the CPU

• Deciding which pages to move to swap space when memory is full

• Organizing files on disk

• Managing peripheral devices