ISRO CS 2008

Question 41

Raid configurations of the disks are used to provide

• Fault-tolerance

• High speed

• High data density

• A & B

Question 42

Which of the following need not necessarily be saved on a context switch between processes?

• General purpose registers
• Translation look-aside buffer
• Program counter
• All of the above

Question 43

Which of the following is termed as minimum error code

• Binary code
• Gray code
• Excess 3 code
• Octal code

Question 44

The total time to prepare a disk drive mechanism for a block of data to be read from it is

• seek time
• latency
• latency plus seek time
• transmission time

Question 45

Feedback queues

• are very simple to implement
• dispatch tasks according to execution characteristics
• are used to favour real time tasks
• require manual intervention to implement properly

Question 46

With Round-Robin CPU scheduling in a time shared system

• using very large time slices (quantas) degenerates into FirstCome First served (FCFS) algorithm.
• using extremely small time slices improves performance
• using very small time slices degenerates into Last-In First-Out (LIFO) algorithm.
• using medium sized times slices leads to shortest Request time First (SRTF) algorithm

Question 47

Dynamic address translation

• is part of the operating system paging algorithm
• is useless when swapping is used
• is the hardware necessary to implement paging
• storage pages at a specific location on disk

Question 48

Thrashing

• always occurs on large computers
• is a natural consequence of virtual memory systems
• can always be avoided by swapping
• can be caused by poor paging algorithms

Question 49

What is the name of the operating system that reads and reacts in terms of operating system?

• Batch system
• Quick response time
• real time system
• Time sharing system

Question 50

The Memory Address Register

• is a hardware memory device which denotes the location of the current instruction being executed.
• is a group of electrical circuit, that performs the intent of instructions fetched from memory
• contains the address of the memory location that is to be read from or stored into
• contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write"