Operating System Mcqs

Page No. 15

Semaphores are mostly used to implement ____________


aSystem calls

✖


bIPC mechanisms

✓


cSystem protection

✖


dNone of the mentioned

✖


View Answer IPC mechanisms

A binary semaphore is a semaphore with integer values ____________


a1

✓


b-1

✖


c0.8

✖


d0.5

✖


View Answer 1

At a particular time of computation the value of a counting semaphore is 7.Then 20 P operations and 15 V operations were completed on this semaphore. The resulting value of the semaphore is? (GATE 1987)


a42

✖


b2

✓


c7

✖


d12

✖


View Answer 2

What is a mutex?


ais a binary mutex

✖


bmust be accessed from only one process

✓


ccan be accessed from multiple processes

✖


dnone of the mentioned

✖



What are the two kinds of semaphores?


amutex & counting

✖


bbinary & counting

✓


ccounting & decimal

✖


ddecimal & binary

✖


View Answer binary & counting

What is a semaphore?


ais a binary mutex

✖


bmust be accessed from only one process

✖


ccan be accessed from multiple processes

✓


dnone of the mentioned

✖



What will happen if a non-recursive mutex is locked more than once?


aStarvation

✖


bDeadlock

✓


cAging

✖


dSignaling

✖


View Answer Deadlock

A deadlock free solution to the dining philosophers problem ____________


anecessarily eliminates the possibility of starvation

✖


bdoes not necessarily eliminate the possibility of starvation

✓


celiminates any possibility of any kind of problem further

✖


dnone of the mentioned

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The dining – philosophers problem will occur in case of ____________


a5 philosophers and 5 chopsticks

✓


b4 philosophers and 5 chopsticks

✖


c3 philosophers and 5 chopsticks

✖


d6 philosophers and 5 chopsticks

✖



To ensure difficulties do not arise in the readers – writers problem _______ are given exclusive access to the shared object.


areaders

✖


bwriters

✓


creaders and writers

✖


dnone of the mentioned

✖


View Answer writers

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