Multiple Choice Questions of OS

By: Prof. Dr. Fazal Rehman | Last updated: May 30, 2025

1. On which selection does the accuracy of the working set depend?
(A) Working set size
(B) Number of pages in memory
(C) Memory size
(D) Working set model

2. What helps in indirect communication between processes P and Q?
(A) There is a mailbox to help communication between P and Q
(B) There is another process R to handle and pass on the messages between P and Q
(C) There is another machine between the two processes to help communication
(D) None of the mentioned

3. Why does a set of processes become deadlocked?
(A) Because each process is terminated
(B) Because each process is blocked and will remain so forever
(C) Because all processes are trying to kill each other
(D) None of these

4. If a working set window is too small, what will happen?
(A) It will cause memory problems
(B) It may overlap several localities
(C) It will not encompass entire locality
(D) None of the mentioned

5. In the non-blocking send, the sending process _______________
(A) Keeps sending until the message is received
(B) Keeps sending until it receives a message
(C) Sends the message and resumes operation
(D) None of the above

6. A process stack does not contain ______________
(A) PID of child process
(B) Function parameters
(C) Return addresses
(D) Local variables

7. If working set window is too large, what will happen?
(A) It will not encompass entire locality
(B) It will cause memory problems
(C) It may overlap several localities
(D) None of these

8. In the zero-capacity queue _________________
(A) The sender keeps sending and the messages don’t wait in the queue
(B) The sender blocks until the receiver receives the message
(C) The queue can store at least one message
(D) None of these

9. ____________ system call returns the process identifier of a terminated child.
(A) Exit
(B) Fork
(C) Wait
(D) Get

10. If the sum of the working-set sizes increases, exceeding the total number of available frames, what will happen?
(A) The system crashes
(B) Then the process crashes
(C) The memory overflows
(D) The operating system selects a process to suspend

11. The zero-capacity queue _______________
(A) Is referred to as a link
(B) Is referred to as a message system with no buffering
(C) Is referred to as a message system with buffering
(D) None of the mentioned

12. After the execution of the current process, the address of the next instruction is provided by the _______________
(A) CPU registers
(B) Pipe
(C) Program counter
(D) Process stack