Operating System MCQs

1019 MCQs (Page 14 of 102)

Attempt Operating System Quiz

A binary semaphore is a semaphore with integer values ____________

A. 1
B. -1
C. 0.8
D. 0.5

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The following pair of processes share a common variable X. Process A int Y; A1: Y = X*2; A2: X = Y; Process B int Z; B1: Z = X+1; B2: X = Z; X is set to 5 before either process begins execution. As usual, statements within a process are executed sequentially, but statements in process A may execute in any order with respect to statements in process B. How many different values of X are possible after both processes finish executing?

A. Two
B. Three
C. Four
D. Eight

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The program follows to use a shared binary semaphore T. Process A int Y; A1: Y = X*2; A2: X = Y; signal(T); Process B int Z; B1: wait(T); B2: Z = X+1; X = Z; T is set to 0 before either process begins execution and, as before, X is set to 5. Now, how many different values of X are possible after both processes finish executing?

A. One
B. Two
C. Three
D. Four

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Semaphores are mostly used to implement ____________

A. System calls
B. Ipc mechanisms
C. System protection
D. None of the mentioned

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Spinlocks are intended to provide __________ only.

A. Mutual exclusion
B. Bounded waiting
C. Aging
D. Progress

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What memoory management technique is the most effective when it comes to time sharing?

A. Virtual Memory
B. Non-contiguous Memory Allocation
C. No effective technique
D. None of these

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With multiprogramming ______ is used productively.

A. Time
B. Space
C. Money
D. All of the mentioned

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What are the two steps of a process execution?

A. I/o & os burst
B. Cpu & i/o burst
C. Memory & i/o burst
D. Os & memory burst

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An I/O bound program will typically have ____________

A. A few very short cpu bursts
B. Many very short i/o bursts
C. Many very short cpu bursts
D. A few very short i/o bursts

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A process is selected from the ______ queue by the ________ scheduler, to be executed.

A. Blocked, short term
B. Wait, long term
C. Ready, short term
D. Ready, long term

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