Classical

Operating System - Memory Management

6:  

In real-time operating systems, which of the following is the most suitable scheduling scheme?

A.

round-robin

B.

first-come-first-served

C.

preemptive

D.

random scheduling

 
 

Option: C

Explanation :


7:  

Dirty bit is used to show the

A.

page with corrupted data

B.

the wrong page in the memory

C.

page that is modified after being loaded into cache memory

D.

page that is less frequently accessed

 
 

Option: C

Explanation :


8:  

If there are 32 segments, each of size 1 K byte, then the logical address should have

A.

13 bits

B.

14 bits

C.

15 bits

D.

16 bits

 
 

Option: C

Explanation :

Th specify a particular segment, 5 bits are required (since 25 = 32). . Having selected a page, to select a particular byte one needs 10 bits (since 210 = 1 k byte). So, totally 5 + 10 =15 bits are needed.


9:  

The first-fit, best-fit and the worst-fit algorithm can be used for

A.

contiguous allocation of memory

B.

linked allocation of memory

C.

indexed allocation of memory

D.

all of these

 
 

Option: A

Explanation :


10:  

Consider a computer with 8 Mbytes of main memory and a 128 K cache. The cache block size is 4 K. It uses a direct mapping scheme for cache management. How many different main memory blocks can map onto a given physical cache block ?

A.

2048

B.

256

C.

64

D.

None of these

 
 

Option: C

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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