UGC NET Computer Science July 2018 - II Question 51

Question 51

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51. At a particular time of computation, the value of a counting semaphore is 10. Then 12 P operations and “x” V operations were performed on this semaphore. If the final value of semaphore is 7, x will be :

Options:

1. (1) 8
2. (2) 9
3. (3) 10
4. (4) 11

Answer : (2) 9

Explanation Question 51

Intially the value of a counting semaphore is 10 Now 12 P operation are performed.

Now counting semaphore value = -2

“x” V operations were performed on this semaphore

Final value of counting semaphore = 7
∴ ( “x” V operations + current counting semaphore value (-2) ) = 7
∴ x + (-2) = 7
∴ x = 7 + 2
∴ x = 9.

So, option (2) is correct answer.

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