ISRO CS 2008

Question 51

Which of the following is an example of spooled device?

• A line printer used to print the output of a number of jobs
• A terminal used to enter input data to a running program
• A secondary storage device in a virtual memory system
• A graphic display device

Question 52

Dirty bit for a page in a page table

• helps avoid unnecessary writes on a paging device
• helps maintain LRU information
• allows only read on a page
• None of the above

Question 53

Checkpointing a job

• allows it to be completed successfully
• allows it to continue executing later
• prepares it for finishing
• occurs only when there is an error in it

Question 54

A public key encryption system

• allows anyone to decode the transmissions
• allows only the correct sender to decode the data
• allows only the correct receiver to decode the data
• does not encode the data before transmitting it

Question 55

Overlaying

• requires use of a loader
• allows larger programs, but requires more effort
• is most used on large computers
• is transparent to the user

Question 56

A critical section is a program segment

• which should run in a certain amount of time
• which avoids deadlocks
• where shared resources are accessed
• which must be enclosed by a pair of semaphore operations P and V

Question 57

Fork is

• the creation of a new job
• the dispatching of a task
• increasing the priority of a task
• the creation of a new process

Question 58

Which of the following need not necessarily be saved on a Context Switch between processes?

• General purpose registers
• Translation look-aside buffer
• Program counter
• Stack pointer

Question 59

Consider a logical address space of 8 pages of 1024 words mapped into memory of 32 frames. How many bits are there in the logical address?

• 13 bits
• 15 bits
• 14 bits
• 12 bits

Question 60

The performance of Round Robin algorithm depends heavily on

• size of the process
• the I/O bursts of the process
• the CPU bursts of the process
• the size of the time quantum