1
GATE CSE 2024 Set 2
MCQ (More than One Correct Answer)
+1
-0.33

Consider a process P running on a CPU. Which one or more of the following events will always trigger a context switch by the OS that results in process P moving to a non-running state (e.g., ready, blocked)?

A

P makes a blocking system call to read a block of data from the disk

B

P tries to access a page that is in the swap space, triggering a page fault

C

An interrupt is raised by the disk to deliver data requested by some other process

D

A timer interrupt is raised by the hardware

2
GATE CSE 2024 Set 2
MCQ (Single Correct Answer)
+2
-0.66

Consider a single processor system with four processes A, B, C, and D, represented as given below, where for each process the first value is its arrival time, and the second value is its CPU burst time.

A (0, 10), B (2, 6), C (4, 3), and D (6, 7).

Which one of the following options gives the average waiting times when preemptive Shortest Remaining Time First (SRTF) and Non-Preemptive Shortest Job First (NP-SJF) CPU scheduling algorithms are applied to the processes?

A

SRTF = 6, NP-SJF = 7

B

SRTF = 6, NP-SJF = 7.5

C

SRTF = 7, NP-SJF = 7.5

D

SRTF = 7, NP-SJF = 8.5

3
GATE CSE 2024 Set 2
MCQ (More than One Correct Answer)
+2
-0.66

Consider a multi-threaded program with two threads T1 and T2. The threads share two semaphores: s1 (initialized to 1) and s2 (initialized to 0). The threads also share a global variable x (initialized to 0). The threads execute the code shown below.

// code of T1

wait(s1);

x = x + 1;

print(x);

wait(s2);

signal(s1);

// code of T2

wait(s1);

x = x + 1;

print(x);

signal(s2);

signal(s1);

Which of the following outcomes is/are possible when threads T1 and T2 execute concurrently?

A

T1 runs first and prints 1, T2 runs next and prints 2

B

T2 runs first and prints 1, T1 runs next and prints 2

C

T1 runs first and prints 1, T2 does not print anything (deadlock)

D

T2 runs first and prints 1, T1 does not print anything (deadlock)

4
GATE CSE 2024 Set 2
Numerical
+2
-0.66

Consider a disk with the following specifications: rotation speed of 6000 RPM, average seek time of 5 milliseconds, 500 sectors/track, 512-byte sectors. A file has content stored in 3000 sectors located randomly on the disk. Assuming average rotational latency, the total time (in seconds, rounded off to 2 decimal places) to read the entire file from the disk is _________

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