Classical

Operating System - Virtual Memory

1:  

In a system that does not support swapping

A.

the compiler normally binds symbolic addresses (variables) to relocatable addresses

B.

the compiler normally binds symbolic addresses to physical address

C.

the loader binds relocatable addresses to physical addresses

D.

binding of symbolic addresses to physical addresses normally takes place during execution

 
 

Option: A

Explanation :


2:  

A demand paging system, with page table held in registers, takes 5 ms to service a page fault if an empty page is available, or if the page to be replaced is not dirty. It takes 15 ms if the replaced page is dirty. Memory access time is 1ms. Assume we want an effective access time of 2ms and that the page to be replaced is dirty 60% of the time. What is the approximate maximum acceptable page fault rate to meet this access time requirement ?

A.

0.1%

B.

1.0%

C.

2.5%

D.

0.01%

 
 

Option: D

Explanation :


3:  

To obtain better memory utilization, dynamic loading is used. With dynamic loading, a routine is not loaded until it is called for. For implementing dynamic loading

A.

special support from hardware is essential

B.

special support from operating system is essential

C.

special support from both hardware and operating system are essential

D.

user programs can implement dynamic loading without any special support from the operating system or the hardware

 
 

Option: D

Explanation :


4:  

Fixed partitions

A.

are very common in current operating systems

B.

are very efficient in memory utilization

C.

are very inefficient in memory utilization

D.

are most used on large mainframe operating systems

 
 

Option: C

Explanation :


5:  

Which of the following statements is false?

A.

Segmentation suffers from external fragmentation.

B.

Paging suffers from internal fragmentation.

C.

Segmented memory can be paged.

D.

Virtual memory is used only in multi-user systems.

 
 

Option: D

Explanation :




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Syllabus covered in this section is-

  • Main functions of operating systems
  • Multiprogramming, multiprocessing and multitasking
  • Memory Management- Virtual memory, paging, fragmentation
  • Concurrent Processing: Mutual exclusion, Critical regions, locks and unlock.
  • Scheduling: CPU scheduling. I/O scheduling, Resource scheduling
  • Deadlock and scheduling algorithms.
  • Banker's algorithm for deadlock handling.

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