Operating System MCQs : Section 1

1. Which of the following is a single-user operating system ?

A) Windows
B) MAC
C) MS Dos
D) None of these

Answer : C) MS Dos

2. When a process is in a “Blocked” state waiting for some I/O service. When the service is completed, it goes to the ……….

A) Terminated state
B) Suspended state
C) Running state
D) Ready state

Answer : D) Ready state

3. Out of these page replacement algorithms, Which one suffers from Belady’s anomaly ?

A) LRU
B) FIFO
C) Both LRU and FIFO
D) Optimal Page Replacement

Answer : B) FIFO

4. Banker's algorithm is used ?

A) To prevent deadlock
B) To deadlock recovery
C) To solve the deadlock
D) None of these

Answer : A) To prevent deadlock

5. The Virtual memory is

A) An illusion of a large main memory
B) A large main memory
C) A large secondary memory
D) None of the above

Answer : A) An illusion of a large main memory

6. Which scheduling policy is most suitable for a time-shared operating systems ?

A) Shortest Job First
B) Round Robin
C) First Come First Server
D) Elevator

Answer : B) Round Robin

7. Dirty bit for a page in a page table

A) helps avoid unnecessary writes on a paging device
B) helps maintain LRU information
C) allows only read on a page
D) None of the above

Answer : A) helps avoid unnecessary writes on a paging device

8. Thrashing

A) reduces page I/O
B) decreases the degree of multiprogramming
C) implies excessive page I/O
D) improves the system performance

Answer : C) implies excessive page I/O

9. The ………. program initializes all aspects of the system, from CPU registers to device controllers and the contents of main memory, and then starts the operating system.

A) Bootstrap
B) Main
C) Bootloader
D) Rom

Answer : A) Bootstrap

10. What is the objective of multiprogramming ?

A) Have a process running at all time
B) Have multiple programs waiting in a queue ready to run
C) To increase CPU utilization
D) None of the mentioned

Answer : C) To increase CPU utilization



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