Model Viva

In ---------- free space management method, the addresses of n free blocks are stored in the first free block

• counting

• linked list

• grouping

• bit map

Which of the following is not a disk free space management method

• Bit vector

• Byte vector

• linked list

• grouping

Consider a machine with 128 MB physical memory and a 32-bit virtual address space. If the page size is 4KB, what is the approximate size of the page table?

• 4 MB

• 2MB

• 8 MB

• 16 MB

A memory management system has 256 pages with 1K bytes page size. Physical memory consists of 64 page frames. Number of bits required in logical and physical address are respectively:

• 18,18

• 16,18

• 18,16

• 18,32

A memory buffer used to accommodate a speed differential is called

• disk buffer

• stack

• cache

• accumulator

The interval from the time of submission of a process to the time of completion is termed as ____________

• response time

• turn around time

• waiting time

• throughput

An I/O bound program will typically have :

• a few very short CPU bursts

• many very short I/O bursts

• many very short CPU bursts

• a few very short I/O bursts

Thrashing can be avoided if

• the speed of CPU is increased

• the speed of I/O processor is increased

• the speed of both CPU and I/O processor is increased

• the pages, belonging to the working set of the programs, are in main memory

--------- technique considers both the reference bit and modify bit for page replacement

• Second-chance algorithm

• MFU page-replacement algorithm

• Additional-Reference- Bits algorithm

• Enhanced second chance algorithm

Assume there are 120 free frames available in the memory. There are three processes P1, P2 and P3 of size 30, 150 and 180 KB respectively. Assume the page and frame size is 1 KB. Using proportional allocation method, determine how many frames will be allocated to all the three processes

• P1=10 frames, P2=50 frames, P3=60 frames

• P1=50 frames, P2=10 frames, P3=60 frames

• P1=5 frames, P2=55 frames, P3=60 frames

• P1=10 frames, P2=55 frames, P3=55 frames