NPTEL Introduction to Operating Systems Assignment 4 Answer

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NPTEL Introduction to Operating Systems Assignment 4 Answer – Here All The Questions and Answers Provided to Help All The Students and NPTEL Candidate as a Reference Purpose, It is Mandetory to Submit Your Weekly Assignment By Your Own Understand Level.

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1 point

A double fault is a fault that occurs when a CPU is trying to call an exception handler.

 True

 False

Ans  – C

1 point

Arrange in order of occurance

   a) Obtain the IRQ number from the interrupt controller

   b) I/O APIC transfer interrupt to Local APIC.

   c) Save the program states

   d)Local APIC assert the CPU interrupt

 a, b, c, d

 b, c, d, a

 b, d, a, c

 d, b, c, a

Ans  – D

1 point

A system n processes, and with a non preemptive scheduler. What is the total number of scheduling possible?

 n

 n!

 n(n-1)

Ans  – C

2n2n

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1 point

When a CPU is interrupted, it

 Stops executing instructions

 Acknowledge interrupt and continues

 Acknowledge interrupt and branches to a subroutine

 Acknowledge interrupt and waits for the next instruction from the interrupted device

Consider a system having n CPUs, k processes, and k > n. Calculate the upper bound  and lower bound for the number of processes in the RUNNING, READY and BLOCKED states.

1 point

The upper bound is :

 k, k, k

 n, k, k

 k, k , n

 k, n, k

Ans  – B

1 point

The lower bound is :

 1, 1, 1

 0, 0, 0

 0, 1 , 1

 1, 1, 0

Ans  – D

1 point

Six bytes are required to store the Interrupt gate descriptor in Intel’s 80386 processor. Each descriptor comprises of 32 bits for the segment
selector and 16 bits for the offset(segment selector:offset). What is the total size in bytes of the interrupt descriptor table (IDT)?

 1256

 1024

 1536

 1280

Ans  – C

1 point

Which one of the following is FALSE?

 Kernel level threads cannot share the code segment

 User level threads are not scheduled by the kernel

 Context switching between user level threads is faster than context switching between kernel level threads

 When a user level thread is blocked, all other threads of its process are blocked

Ans  – A

1 point

Context switching is not required for a system without multiprogrammed OS

 True

 False

Ans  – A

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1 point

Which of the below statement is False?

 Kernel stack can be used to store the context of a process

 User stack is used to store the function details during function calls

 Kernel stack is used to store the function arguments during systems calls

 Context of the process is useful to restart the process after some time

Ans  – B

1 point

 a-3, b-1 c-4, d-2

 a-3, b-4,c-1, d-3

 a-4, b-1, c-4, d-2

 a-4, b-3, c-2, d -1

Ans  – B

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