Operating System Multiple Choice Questions - Set 5

Operating system multiple choice questions and answers with appropriate explanation.

1)  PMTLR is acronym for ?
  1. Page Map Table Limit Register
  2. Page Memory Table With Limit Register
  3. Both A and B
  4. None of these
Show/Hide Answer
Answer =  A 
Explanation: N/A

2) Paging is ?
  1. Virtual memory
  2. Memory management scheme
  3. Allocation of memory
  4. Deadlock prevention scheme
Show/Hide Answer
Answer =  B
Explanation: paging is one of the memory-management schemes by which a computer can store and retrieve data from secondary storage for use in main memory.

3) Chaining and indexing are the strategies of ?
  1. Contiguous allocation
  2. Non - Contiguous allocation
  3. Partition allocation
  4. Static allocation
Show/Hide Answer
Answer = B 
Explanation: Chaining and Indexing are Non Contiguous Allocation strategies that contains pointes to the memory locations.

4) Which of the following scheduler is in charge of handling the swapped out process ?
  1. short term
  2. long term
  3. medium term
  4. none of these
Show/Hide Answer
Answer =  A
Explanation: The short-term scheduler (also known as the CPU scheduler) decides which of the ready, in-memory processes are to be executed (allocated a CPU) next following a clock interrupt, an IO interrupt, an operating system call or another form of signal.

5) Round robin scheduling algorithm falls under the category of ?
  1. Preemptive scheduling
  2. Non preemptive scheduling
  3. sometimes preemptive sometimes non preemptive
  4. None of these
Show/Hide Answer
Answer =  A
Explanation: Round-robin (RR) is one of the simplest scheduling algorithms for processes in an operating system. As the term is generally used, time slices are assigned to each process in equal portions and in circular order, handling all processes without priority.In order to schedule processes fairly, a round-robin scheduler generally employs time-sharing, giving each job a time slot or quantum (its allowance of CPU time), and interrupting the job if it is not completed by then. So it falls under preemptive scheduling.

6) Only the process executing the critical section is allowed access to the shared variable, all other processes should prevented from doing so until the completion of the critical section. This is often referred to as ?
  1. Mutual exclusion
  2. Semaphores
  3. Deadlock
  4. Interprocess communication
Show/Hide Answer
Answer =  A
Explanation: N/A
7) Partition Description Table (PDT) collect the ?
  1. Current Partition Status
  2. Attributes
  3. Both A and B
  4. None of these
Show/Hide Answer
Answer =  C
Explanation: n/a

8) Belady's Anomaly is a behavior of which page replacement algorithm ?
  1. FIFO
  2. Optimal
  3. Circular FIFO
  4. LRU
Show/Hide Answer
Answer = A 
Explanation: Bélády's anomaly proves that it is possible to have more page faults when increasing the number of page frames while using the First in First Out (FIFO) page replacement algorithm.

9) Which of the following is an operating system call ?
  2. LINK
  4. All of these
Show/Hide Answer
Answer = D 
Explanation: N/A

10) The reference bit is used for the purpose of ?
  1. Improving MRU algorithm
  2. Implementing LRU page replacement algorithm
  3. Checking of the page table entry is in cache memory
  4. Checking to see if parameters are passed to a procedure by value or by address
Show/Hide Answer
Answer = A
Explanation: N/A
Tags : Operating system objective type questions with answers, Operating system MCQs, OS mcq, OS quiz

Do You Like This? Please take 5 seconds to share with your firends.


Post a Comment