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Q161 MCQ GATE CS Easy 1 Mark 2024

OS → Process Management

Which of the following process state transitions is NOT possible?

Choose One:

A) Running to Ready

B) Waiting to Running

C) Ready to Waiting

D) Running to Terminated

Correct Answer:
Explanation:

Q162 MCQ GATE CS Hard 2 Marks 2024

OS → Concurrency

Consider functions incr() { wait(s); X=X+1; signal(s); } and decr() { wait(s); X=X-1; signal(s); }. There are 5 threads invoking incr and 3 threads invoking decr on a shared variable X (initial value 10). Implementation I-1 uses a binary semaphore (s=1). Implementation I-2 uses a counting semaphore (s=2). Let V1, V2 be the minimum possible values of X at the end of execution with I-1 and I-2. Which choice represents V1, V2?

Choose One:

A) 15, 7

B) 7, 7

C) 12, 7

D) 12, 8

Correct Answer:
Explanation:

Q163 MCQ GATE CS Hard 2 Marks 2024

OS → Concurrency

Consider two threads T1 and T2 that update two shared variables a and b. Assume that initially a=b=1. Though context switching between threads can happen at any time, each statement of T1 or T2 is executed atomically without interruption. T1: { a=a+1; b=b+1; } T2: { b=2b; a=2a; } Which one of the following options lists all the possible combinations of values of a and b after both T1 and T2 finish execution?

Choose One:

A) (a=4, b=4); (a=3, b=3); (a=4, b=3)

B) (a=3, b=4); (a=4, b=3); (a=3, b=3)

C) (a=4, b=4); (a=3, b=4); (a=4, b=3); (a=3, b=3)

D) (a=4, b=4); (a=4, b=3); (a=3, b=4)

Correct Answer:
Explanation:

Q164 MCQ GATE CS Hard 2 Marks 2024

OS → Concurrency

Consider two threads T1 and T2 that update two shared variables a and b. Assume that initially a=b=1. Though context switching between threads can happen at any time, each statement of T1 or T2 is executed atomically without interruption. T1: { a=a+1; b=b+1; } T2: { b=2b; a=2a; } Which one of the following options lists all the possible combinations of values of a and b after both T1 and T2 finish execution?

Choose One:

A) (a=4, b=4); (a=3, b=3); (a=4, b=3)

B) (a=3, b=4); (a=4, b=3); (a=3, b=3)

C) (a=4, b=4); (a=3, b=4); (a=4, b=3); (a=3, b=3)

D) (a=4, b=4); (a=4, b=3); (a=3, b=4)

Correct Answer:
Explanation:

Q165 NAT GATE CS Easy 2 Marks 2024

OS → Secondary Storage

Consider a 512 GB hard disk with 32 storage surfaces. There are 4096 sectors per track and each sector holds 1024 bytes of data. The number of cylinders in the hard disk is

Enter Numerical Answer:

Correct Answer:
Explanation:

1
2
3
.....
31
32
33
34
35
.....
93
94
95

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