Consider the following scenario where two processes are sharing a common variable. Global setup int turn = 1; Process 1 while(1) { while(turn == 2); // lock // critical section turn = 2; // unlock // remainder section } Process 2 while(1) { while(turn == 1); // lock // critical section turn = 1; // unlock // remainder section } Which of the following statements about the given processes is correct?

(A) Process 1 and Process 2 will enter their critical sections simultaneously, leading to race conditions.

(B) Process 1 will always enter its critical section before Process 2.

(C) Process 2 will always enter its critical section before Process 1.

(D) Deadlock can occur if both processes try to enter their critical sections simultaneously.

Operating Systems Quiz 2: 23 November 2025 (September 2025 term)

Question 1

+4 marksOne correct option

Consider the following scenario where two processes are sharing a common variable.

Global setup

1int turn = 1;

Process 1

1while(1) {
2    while(turn == 2); // lock
3    // critical section
4    turn = 2; // unlock
5    // remainder section
6}

Process 2

1while(1) {
2    while(turn == 1); // lock
3    // critical section
4    turn = 1; // unlock
5    // remainder section
6}

Which of the following statements about the given processes is correct?

A
Process 1 and Process 2 will enter their critical sections simultaneously, leading to race conditions.
B
Process 1 will always enter its critical section before Process 2.
C
Process 2 will always enter its critical section before Process 1.
D
Deadlock can occur if both processes try to enter their critical sections simultaneously.

Also asked in Quiz 2 4 Aug 2024, Quiz 2 16 Mar 2025

Question 2

+3 marksOne correct option

A
Mutual exclusion
B
Progress
C
Bounded waiting
D
None of these

Question 3

+3 marksOne correct option

A
7F 42 43 44 02 01 01 00
B
7F 45 4D 50 02 01 01 00
C
7F 45 4C 46 02 01 01 00
D
7F 50 51 52 02 01 01 00

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More on the Operating Systems Quiz 2 23 Nov 2025 paper

The IIT Madras BS Operating Systems (Operating Systems) Quiz 2 paper sat on 23 Nov 2025, in the September 2025 term: 17 questions for 50 marks in 120 minutes. The first 3 questions are below. Sign in with Google — it is free — to see the whole paper with its answers and explanations, in learning mode or as a timed mock test.

Feature	Operating Systems Quiz 2 23 Nov 2025 at a glance
Term	September 2025 term
Subject	Operating Systems
Course code	BSCS4022
Questions	17
Marks	50
Duration	120 min
MCQ	10
MSQ	3
Numerical	4
Official paper	IIT M DEGREE AN EXAM QDB2 23 Nov 2025 NEW
Negative marking	No negative marking.
Updated	25 Sept 2026