Introduction To Operating Systems NPTEL Week 2 Assignment

                     

Course Name: Introduction To Operating Systems NPTEL

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These are answers of Introduction To Operating Systems NPTEL Week 2 Assignment


Q1. Match the Following

a) Present bit    1) Difference in contents of page in RAM and the Disk
b) Dirty bit         2) Moving page from Disk to Memory
c) Swap out      3) Moving page from memory to Disk
d) Swap in        4) page is present in RAM

a-1, b-3, c-4, d-2

a-2, b-1, c-4, d-3

a-3, b-4, c-2, d-1

a-4, b-1, c-3, d-2

Answer: d. a-4, b-1, c-3, d-2


Q2. Consider a system using 2-level paging and the virtual address is 38 bits. The most significant 10 bits are used to index the page directory and next 16 bits index the page table. Each entry in both levels is 4 Bytes. What is the maximum size of a page table in KB?

Answer: 256


Q3. Consider a system using 2-level paging and the virtual address is 38 bits. The most significant 10 bits are used to index the page directory and next 16 bits index the page table. Each entry in both levels is 4 Bytes. What is the maximum number of page tables that a process can have?

Answer: 4096


These are answers of Introduction To Operating Systems NPTEL Week 2 Assignment


Q4. Consider a system with total memory available is 2^(38) bytes. A user write a C program on this system that uses the entire addressing space. What is the size of a pointer (in bytes) defined in this C program.

Answer: 5


Q5. Consider the following memory map using multiprogram with partition model. Blue represent memory in use while white represent free memory as shown in the figure below.

These are answers of Introduction To Operating Systems NPTEL Week 2 Assignment

Request for memory follows the following order : 100k, 25k, 125k, 50k. Which of the following allocation satisfies the above request?
1)Best Fit 2)First Fit 3)Worst Fit

1,2,3

1,2

2,3

None of these

Answer: b.1,2


These are answers of Introduction To Operating Systems NPTEL Week 2 Assignment


Q6. Match the following

a)CR0            1)Removes free pages from a linked list
b)CR3            2) Enable paging
c)kalloc( )        3) Page directory point register
d)kfree( )         4) Add free pages to a linked list

a-3, b-2, c-1, d-4

a-2, b-3, c-1, d-4

a-2, b-3, c-4, d-1

a-3, b-2, c-4, d-1

Answer: c. a-2, b-3, c-4, d-1


Q7. During swap out of a page all the changes that occurred in a page are updated in the main memory.

True

False

Answers: True


Q8. Sector 0 is of _____________ bytes, which is loaded into the location _____________

512, 0xffff0

1024, 0xffff0

512, 0x7c00

1024, 0x7c00

Answer: c. 512, 0x7c00


These are answers of Introduction To Operating Systems NPTEL Week 2 Assignment


Q9. The bootloader switches the OS to _____________ from _____________.

Protected mode, Real mode

User mode, kernel mode

User mode, protected mode

Real mode, Protected mode.

Answer: a. Protected mode, Real mode


Q10. Consider the following memory map using the partition model, with Blue representing memory in use and White representing free memory.

These are answers of Introduction To Operating Systems NPTEL Week 2 Assignment

A new process Pnew is of size 10k. In which partition is Pnew placed for

a)Best Fit : _____________k
b)First Fit : _____________k
c)Worst Fit : _____________k

10, 11, 11

10, 10, 11

11, 12, 40

11, 10, 48

Answer: c. 11, 12, 40


These are answers of Introduction To Operating Systems NPTEL Week 2 Assignment

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These are answers of Introduction To Operating Systems NPTEL Week 2 Assignment