Question 1

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

Accepted Answer

A) 13 bits 
B) 14 bits 
C) 15 bits 
D) 16 bits 
A) 13 bits 
B) 14 bits 
C) 15 bits 
D) 16 bits A

Question 2

The minimum number of page frames that must be allocated to a running process in a virtual memory environment is determined by

Accepted Answer

A) the instruction set architecture 
B) page size 
C) physical memory size 
D) number of processes in memory 
A) the instruction set architecture 
B) page size 
C) physical memory size 
D) number of processes in memory A

Question 3

Consider a computer with 8 Mbytes of main memory and a 128K 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?

Accepted Answer

A) 2048 
B) 256 
C) 64 
D) 8 
A) 2048 
B) 256 
C) 64 
D) 8 C

Question 4

The offset 'd' of the logical address must be___________

Accepted Answer

A) greater than segment limit 
B) between 0 and segment limit 
C) between 0 and the segment number 
D) greater than the segment number 
A) greater than segment limit 
B) between 0 and segment limit 
C) between 0 and the segment number 
D) greater than the segment number

Question 5

Magnetic tape drives can write data at a speed___________  disk drives.

Accepted Answer

A) much lesser than 
B) comparable to 
C) much faster than 
D) none of the mentioned 
A) much lesser than 
B) comparable to 
C) much faster than 
D) none of the mentioned

Question 6

The time taken for the desired sector to rotate to the disk head is called

Accepted Answer

A) positioning time 
B) random access time 
C) seek time 
D) rotational latency 
A) positioning time 
B) random access time 
C) seek time 
D) rotational latency

Question 7

Whenever a process needs I/O to or from a disk it issues a___________

Accepted Answer

A) system call to the cpu 
B) system call to the operating system 
C) a special procedure 
D) all of the mentioned 
A) system call to the cpu 
B) system call to the operating system 
C) a special procedure 
D) all of the mentioned

Question 8

A multilevel page table is preferred in comparison to a single level page table for translating virtual address to physical address because___________

Accepted Answer

A) it reduces the memory access time to read or write a memory location 
B) it helps to reduce the size of page table needed to implement the virtual address space of a process 
C) it is required by the translation lookaside buffer 
D) it helps to reduce the number of page faults in page replacement algorithms 
A) it reduces the memory access time to read or write a memory location 
B) it helps to reduce the size of page table needed to implement the virtual address space of a process 
C) it is required by the translation lookaside buffer 
D) it helps to reduce the number of page faults in page replacement algorithms

Question 9

The protection bit is 0/1 based on

Accepted Answer

A) write only 
B) read only 
C) read - write 
D) none of the mentioned 
A) write only 
B) read only 
C) read - write 
D) none of the mentioned

Question 10

What is the disk bandwidth?

Accepted Answer

A) the total number of bytes transferred 
B) total time between the first request for service and the completion on the last transfer 
C) the total number of bytes transferred divided by the total time between the first request for service and the completion on the last transfer 
D) none of the mentioned 
A) the total number of bytes transferred 
B) total time between the first request for service and the completion on the last transfer 
C) the total number of bytes transferred divided by the total time between the first request for service and the completion on the last transfer 
D) none of the mentioned

Question 11

___________  controller sends the command placed into it, via messages to the___________ controller.

Accepted Answer

A) host, host 
B) disk, disk 
C) host, disk 
D) disk, host 
A) host, host 
B) disk, disk 
C) host, disk 
D) disk, host

Question 12

The time taken to move the disk arm to the desired cylinder is called the___________

Accepted Answer

A) positioning time 
B) random access time 
C) seek time 
D) rotational latency 
A) positioning time 
B) random access time 
C) seek time 
D) rotational latency

Question 13

What is the host controller?

Accepted Answer

A) controller built at the end of each disk 
B) controller at the computer end of the bus 
C) all of the mentioned 
D) none of the mentioned 
A) controller built at the end of each disk 
B) controller at the computer end of the bus 
C) all of the mentioned 
D) none of the mentioned

Question 14

The heads of the magnetic disk are attached to a___________that moves all the heads as a unit.

Accepted Answer

A) spindle 
B) disk arm 
C) track 
D) none of the mentioned 
A) spindle 
B) disk arm 
C) track 
D) none of the mentioned

Question 15

When the entries in the segment tables of two different processes point to the same physical location___________

Accepted Answer

A) the segments are invalid 
B) the processes get blocked 
C) segments are shared 
D) all of the mentioned 
A) the segments are invalid 
B) the processes get blocked 
C) segments are shared 
D) all of the mentioned

Question 16

If a process needs I/O to or from a disk, and if the drive or controller is busy then

Accepted Answer

A) the request will be placed in the queue of pending requests for that drive 
B) the request will not be processed and will be ignored completely 
C) the request will be not be placed 
D) none of the mentioned 
A) the request will be placed in the queue of pending requests for that drive 
B) the request will not be processed and will be ignored completely 
C) the request will be not be placed 
D) none of the mentioned

Question 17

The segment limit contains the

Accepted Answer

A) starting logical address of the process 
B) starting physical address of the segment in memory 
C) segment length 
D) none of the mentioned 
A) starting logical address of the process 
B) starting physical address of the segment in memory 
C) segment length 
D) none of the mentioned

Question 18

In___________information is recorded magnetically on platters.

Accepted Answer

A) magnetic disks 
B) electrical disks 
C) assemblies 
D) cylinders 
A) magnetic disks 
B) electrical disks 
C) assemblies 
D) cylinders

Question 19

If the offset is legal___________

Accepted Answer

A) it is used as a physical memory address itself 
B) it is subtracted from the segment base to produce the physical memory address 
C) it is added to the segment base to produce the physical memory address 
D) none of the mentioned 
A) it is used as a physical memory address itself 
B) it is subtracted from the segment base to produce the physical memory address 
C) it is added to the segment base to produce the physical memory address 
D) none of the mentioned

Question 20

What is the reason for using the LFU page replacement algorithm?

Accepted Answer

A) an actively used page should have a large reference count 
B) a less used page has more chances to be used again 
C) it is extremely efficient and optimal 
D) all of the mentioned 
A) an actively used page should have a large reference count 
B) a less used page has more chances to be used again 
C) it is extremely efficient and optimal 
D) all of the mentioned

Exam 19: Virtual Memory, Segmentation, and Disk Management

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

The minimum number of page frames that must be allocated to a running process in a virtual memory environment is determined by

Consider a computer with 8 Mbytes of main memory and a 128K 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?

The offset 'd' of the logical address must be___________

Magnetic tape drives can write data at a speed___________ disk drives.

The time taken for the desired sector to rotate to the disk head is called

Whenever a process needs I/O to or from a disk it issues a___________

A multilevel page table is preferred in comparison to a single level page table for translating virtual address to physical address because___________

The protection bit is 0/1 based on

What is the disk bandwidth?

___________ controller sends the command placed into it, via messages to the___________ controller.

The time taken to move the disk arm to the desired cylinder is called the___________

What is the host controller?

The heads of the magnetic disk are attached to a___________that moves all the heads as a unit.

When the entries in the segment tables of two different processes point to the same physical location___________

If a process needs I/O to or from a disk, and if the drive or controller is busy then

The segment limit contains the

In___________information is recorded magnetically on platters.

If the offset is legal___________

What is the reason for using the LFU page replacement algorithm?

Operating System

Operating System and Software

Operating System and Computer Basics: Formatting, Clipboard, Radio Buttons, Bankers Algorithm, and More

Computer Software and Operating System

Processor and Memory Fundamentals

Computer Architecture and Memory

Computer Science and Information Technology on Raid, Middleware, and CPU Scheduling

Understanding Process Scheduling in Operating Systems

Operating System and Process Management

Process Scheduling and Synchronization in Multi-Programming Environment

Process Management and Interprocess Communication in Unix

Semaphores, Spinlocks, and Monitors: Understanding Synchronization in Operating Systems

Concurrency Control and Deadlock Prevention in Operating Systems

Deadlock and Resource Allocation in Computer Systems

Memory Management and Swapping Techniques

Memory Management in Operating Systems

Understanding Paging and Memory Management in Operating Systems

Understanding Virtual Memory and Page Replacement Algorithms

Disk Management and I/O Subsystem

Linux Kernel and System Structures

Thread Management and Synchronization in Operating Systems

Operating System Concepts: System Calls, Threads, and Signals

Operating System and Thread Pool

Operating System and Memory Management

Process Control and Memory Management

Linux Kernel, File Systems, Bootloaders and Distributions

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