Question Discussion & Solution

MCQ

Semaphores are mostly used to implement ____________

System calls

IPC mechanisms

System protection

None of the mentioned

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MCQ

A system has 12 magnetic tape drives and 3 processes : P0, P1, and P2. Process P0 requires 10 tape drives, P1 requires 4 and P2 requires 9 tape drives.

Process    
P0            
P1                             
P2                             
 
Maximum needs (process-wise: P0 through P2 top to bottom)    
10             
4   
9
 
Currently allocated (process-wise)
5
2
2

Which of the following sequence is a safe sequence?

P0, P1, P2

P1, P2, P0

P2, P0, P1

P1, P0, P2

Discussion

MCQ

A system is in the safe state if ____________

the system can allocate resources to each process in some order and still avoid a deadlock

there exist a safe sequence

all of the mentioned

none of the mentioned

Discussion

MCQ

The two phase locking protocol consists of ____________

growing and shrinking phase

shrinking and creation phase

creation and growing phase

destruction and creation phase

Discussion

MCQ

Consider a transaction T1 that committed prior to checkpoint. The record appears in the log before the record. Any modifications made by T1 must have been written to the stable storage either with the checkpoint or prior to it. Thus at recovery time ____________

There is a need to perform an undo operation on T1

There is a need to perform a redo operation on T1

There is no need to perform an undo and redo operation on T1

All of the mentioned

Discussion

MCQ

Process synchronization can be done on __________

hardware level

software level

both hardware and software level

none of the mentioned

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category More Operating System Topics

Introduction to Operating System

Types

Services

Structures

Processes

Threads

CPU Scheduling

Process Synchronization

Memory Management

Storage Management

Input Output Systems

Networking

Distributed Operating System

Protection and Security

Unix

Linux

MS Windows

Mixed

Operating Systems Overview

Process Management

Finding and Processing Files

File Management

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