Introduction To Operating Systems NPTEL Week 3 Assignment
These are solution for Introduction To Operating Systems NPTEL Week 3 Assignment
Course Name: Introduction To Operating Systems
Link of course: Click here
Q1) int main(){
int i, n;
for(i=1;i<n; i++){
if (fork() == 0)
printf(“OS”);
printf(“NPTEL”);
}
Number of times OS and NPTEL printed ?
a. 2^n and 2^n
b. 2^(n-1) and 2^(n-1)
c. 2^(n-1)-1 and 2^(n-1)
d. 2^n and 2^(n-1)
Answer: c. 2^(n-1)-1 and 2^(n-1)
These are solution for Introduction To Operating Systems NPTEL Week 3 Assignment
Q2) State True or False.
A program to compute the sum of first 5,000 numbers can be divided into 4 sub parts and executed on 4 CPUs using either fork or threads. The reason why we prefer fork is because large portions of the data/code between the 4 sub-parts are very similar and need not be duplicated.
a. True
b.False
Answer: a. True
Q3) Match the following :
1.NEW A. Waiting for an i/o
2.READY B. Currently Executing
3.RUNNING C. Process is being created
4.SLEEPING D. waiting to be picked up by scheduler
a. 1-A, 2-D, 3-B, 4-C
b. 1-C, 2-B, 3-D, 4-A
c. 1-A, 2-C, 3-D, 4-B
d. 1-C, 2-D, 3-B, 4-A
Answer: d. 1-C, 2-D, 3-B, 4-A
These are solution for Introduction To Operating Systems NPTEL Week 3 Assignment
Q4) State True or False for a process currently in RUNNING state. A software interrupt will result in the change to ring 1.
a. True
b. False
Answer: b. False
Q5) State True or False. In the absence of system calls, a user process can never dynamically allocate memory.
a. True
b. False
Answer: a. True
These are solution for Introduction To Operating Systems NPTEL Week 3 Assignment
Q6) The wait() system call inside the parent process returns the pid of an exiting child process. Which of the following best fits when wait is called inside the child process?
a. Returns -1, when the child is not the parent of any other process
b. Returns its own process id.
c. Returns the exit status of the parent currently exited.
d. Such a call is not feasible and is likely to crash the process.
Answer: a. Returns -1, when the child is not the parent of any other process
These are solution for Introduction To Operating Systems NPTEL Week 3 Assignment
Q7) A student has written a program and used pid = fork() function call in it. The pid returned by the fork was 5129. Which of the following is true about the process invoking fork?
a. Process is a parent process with pid=5129
b. Process is a child process. Its Parent’s pid is 5129
c. The process is a parent process. Its Child’s pid is 5129
d. Process is a child process with pid = 5129
Answer: c. The process is a parent process. Its Child’s pid is 5129
Q8) State True/False
When the child process state is set to Zombie, all page directories and the kernel are also deallocated.
a. True
b. False
Answer: b. False
These are solution for Introduction To Operating Systems NPTEL Week 3 Assignment
Q9) 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: d. Context of the process is useful to restart the process after some time.
Q10) What is the output in the parent process? int main() { int a=0, pid; pid = fork(); if(pid == 0){ a= a – 10; printf(“u = %d\n”, a); } else{ a= a + 10; printf(“x = %d\n”,a); } }
a. U = -10
b. X = 10
c. x=0
d. U = 10
Answer: b. X = 10
These are solution for Introduction To Operating Systems NPTEL Week 3 Assignment
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