Introduction To Operating Systems NPTEL Week 4 Assignment
These are solution for Introduction To Operating Systems NPTEL Week 4 Assignment
Course Name: Introduction To Operating Systems
Link of course: Click here
Q1. A double fault is a fault that occurs when a CPU is trying to call an exception handler.
a. True
b. False
Answer: b. False
Q2. Arrange in order of occurrence
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
Answer: d, b, c, a
These are solution for Introduction To Operating Systems NPTEL Week 4 Assignment
Q3. A system n processes, and with a non preemptive scheduler. What is the total number of scheduling possible?
a. n
b. n!
c. n(n-1)
d. 2^n
Answer: c. n(n-1)
Q4. When a CPU is interrupted, it
a. Stops executing instructions
b. Acknowledge interrupt and continues
c. Acknowledge interrupt and branches to a subroutine
d. Acknowledge interrupt and waits for the next instruction from the interrupted device
Answer: Acknowledge interrupt and waits for the next instruction from the interrupted device
These are solution for Introduction To Operating Systems NPTEL Week 4 Assignment
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.
Q5. The upper bound is :
a. k, k, k
b. n, k, k
c. k, k , n
d. k, n, k
Answer: n, k, k
Q6. The lower bound is :
a. 1, 1, 1
b. 0, 0, 0
c. 0, 1 , 1
d. 1, 1, 0
Answer: d. 1, 1, 0
These are solution for Introduction To Operating Systems NPTEL Week 4 Assignment
Q7. 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)?
a. 1256
b. 1024
c. 1536
d. 1280
Answer: c. 1536
These are solution for Introduction To Operating Systems NPTEL Week 4 Assignment
Q8. Which one of the following is FALSE?
a. Kernel level threads cannot share the code segment
b. User level threads are not scheduled by the kernel
c. Context switching between user level threads is faster than context switching between kernel level threads
d. When a user level thread is blocked, all other threads of its process are blocked
Answer: a. Kernel level threads cannot share the code segment
Q9. Context switching is not required for a system without multi programmed OS
a. True
b. False
Answer: a. True
These are solution for Introduction To Operating Systems NPTEL Week 4 Assignment
Q10. Which of the below statement is False?
a. Kernel stack can be used to store the context of a process
b. User stack is used to store the function details during function calls
c. Kernel stack is used to store the function arguments during systems calls
d. Context of the process is useful to restart the process after some time
Answer: b. User stack is used to store the function details during function calls
Q11. Match the following
a) a-3, b-1 c-4, d-2
b) a-3, b-4,c-1, d-3
c) a-4, b-1, c-4, d-2
d) a-4, b-3, c-2, d -1
Answer: b) a-3, b-4,c-1, d-3
These are solution for Introduction To Operating Systems NPTEL Week 4 Assignment
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