BCS Operating Systems 2

Question 1

What is the purpose of the page table in virtual memory management?

Accepted Answer

To map virtual addresses to physical memory addresses

Answer

A page table maintains the mapping between a process's virtual page numbers and the corresponding physical frame numbers in RAM.

Question 2

What is the difference between a process and a thread?

Accepted Answer

A thread is a unit of execution within a process; processes have separate memory spaces

Answer

A process has its own separate memory space and resources, while threads within the same process share memory and resources but have separate execution contexts.

Question 3

Which page replacement algorithm suffers from Belady's Anomaly?

Accepted Answer

First-In First-Out (FIFO)

Answer

FIFO can suffer from Belady's Anomaly, where increasing the number of page frames counterintuitively increases the number of page faults.

Question 4

What is a critical section in concurrent programming?

Accepted Answer

A segment of code that accesses shared resources and must not be executed by more than one process simultaneously

Answer

A critical section is a code segment that accesses shared data and must execute atomically to prevent race conditions in concurrent systems.

Question 5

In Round Robin scheduling, what parameter determines how long each process runs before being preempted?

Accepted Answer

Time quantum

Answer

The time quantum (or time slice) defines the fixed time interval each process is allowed to run before the CPU is given to the next process in the ready queue.

BCS - Bachelor Of Computer Science Degree Practice Test

BCS - Bachelor Of Computer Science Degree Practice Test

BCS Operating Systems 2