BCS Operating Systems

Question 1

What is a deadlock in operating systems?

Accepted Answer

When two or more processes wait indefinitely for resources held by each other

Answer

A deadlock occurs when two or more processes are each waiting for a resource held by another, creating a circular wait with no progress possible.

Question 2

Which CPU scheduling algorithm may cause starvation for low-priority processes?

Accepted Answer

Priority Scheduling

Answer

Priority Scheduling can cause starvation when high-priority processes continuously arrive and prevent low-priority processes from ever executing.

Question 3

What is virtual memory?

Accepted Answer

A technique that uses disk space to extend the apparent available RAM

Answer

Virtual memory uses a portion of the hard disk (swap space or page file) to simulate additional RAM, allowing processes to use more memory than physically available.

Question 4

In the context of OS, what is a semaphore?

Accepted Answer

A synchronization primitive used to control access to shared resources

Answer

A semaphore is a synchronization tool that uses wait() and signal() operations to coordinate access to shared resources and prevent race conditions.

Question 5

What does the term 'thrashing' refer to in operating systems?

Accepted Answer

Excessive paging activity where the OS spends more time swapping pages than executing processes

Answer

Thrashing occurs when a system spends more time handling page faults and swapping pages than executing actual process instructions, severely degrading performance.

BCS - Bachelor Of Computer Science Degree Practice Test

BCS - Bachelor Of Computer Science Degree Practice Test

BCS Operating Systems