DBATU Model MCQ - Operating System

Welcome to your Operating System, dated April 21, 2021

1. A computer system has 4K word cache organised in a block set associative manner ,with 4 blocks as per set ,64 words per block .The number of bits in the SET & WORD field of the main memory address format isDeselect Answer

15,4

6,4

7,2

4,6

2. Which of the following applications are well suited for batch processing ?Deselect Answer

process control

video game control

memory control

preparing mailing addresses

3. A system has 3 processes sharing 4 resources. If each process needs a maximum of 2 units then,deadlockDeselect Answer

can never occur

may occur

has to occur

None of the above

4. Fence register is used forDeselect Answer

CPU protection

memory protection

File protection

All of the above

5. Dijkstra's banking algorithm is an operating system that solves the problem ofDeselect Answer

Deadlock avoidance

Deadlock recovery

Mutual exclusion

Context switching

6. Memory protection is of no use in aDeselect Answer

Single user system

Non-multiprogramming system

Non -multitasking system

None of the above

7. Sector interleaving in disks is done byDeselect Answer

The disk manufaturer

The disk controller cord

The operating system

None of the above

8. A computer system has 6 tape drives ,with 'n' processes competing for them .Each process may need 3 tape drives .The maximum value of 'n' for which the system is guaranteed to be deadlock free isDeselect Answer

9. The size of the virtual memory depends on the size ofDeselect Answer

Data bus

Main memory

Address bus

None of the above

10. In Round Robin CPU scheduling ,as the time quantum is increased,the average turn around time is ,Deselect Answer

increases

decreases

remains constant

varies irregularly

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