Operating System MCQs with Answers
Practice important Operating System MCQs with answers and explanations.
Multiple Choice Questions
Q451: What is the main problem caused when both producer and consumer try to update the counter concurrently?
- A: Buffer overflow
- B: Race condition
- C: Deadlock
- D: Memory leak
View Answer
B
Q452: What is the value of the 'counter' after the producer and consumer execute concurrently with initial value 5?
- A: 4
- B: 5
- C: 6
- D: 7
View Answer
A
Q453: In the producer-consumer problem, what happens when the buffer is full?
- A: The producer stops producing items
- B: The consumer stops consuming items
- C: The system crashes
- D: The buffer automatically resizes
View Answer
A
Q454: In process synchronization, which of the following is a software-based solution to the critical section problem?
- A: Hardware locks
- B: Semaphores
- C: Mutexes
- D: Binary signals
View Answer
B
Q455: What does the 'critical section' refer to in process synchronization?
- A: A section of code in a process where it can access shared data
- B: A section of code that is executed before the process enters the queue
- C: A section of code that performs system initialization
- D: A section of code that manages inter-process communication
View Answer
A
Q456: What is the main issue with the solution that uses a shared variable 'turn' for process synchronization?
- A: It doesn't ensure mutual exclusion
- B: It does not allow for strict alternation between processes
- C: It doesn’t meet the progress requirement
- D: It violates the bounded waiting condition
View Answer
C
Q457: What is the purpose of using the 'turn' variable in the first algorithm for the critical section problem?
- A: To ensure mutual exclusion
- B: To signal that a process is ready to enter the critical section
- C: To allow both processes to run concurrently
- D: To maintain the buffer size
View Answer
A
Q458: Which of the following is true about the solution using the 'turn' variable?
- A: It ensures mutual exclusion but does not satisfy the progress condition
- B: It satisfies all the conditions of the critical section problem
- C: It allows for both processes to execute in parallel
- D: It ensures that one process always has to wait indefinitely
View Answer
A
Q459: In Algorithm 2, what does the 'flag' array represent?
- A: The state of the shared resource
- B: Whether a process is ready to enter its critical section
- C: The status of mutual exclusion
- D: The number of processes waiting for execution
View Answer
B
Q460: What is the issue with Algorithm 2 when both processes set their flags to 'true' simultaneously?
- A: The processes get stuck in an infinite loop
- B: The critical section is not entered
- C: The processes execute out of order
- D: The system crashes
View Answer
A