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MCQ

The system periodically performs checkpoints that consists of the following operation(s) ____________

Putting all the log records currently in main memory onto stable storage

putting all modified data residing in main memory onto stable storage

putting a log record onto stable storage

all of the mentioned

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MCQ

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?

two

three

four

eight

Discussion

MCQ

An un-interruptible unit is known as ____________

single

atomic

static

none of the mentioned

Discussion

MCQ

A deadlock can be broken by ____________

abort one or more processes to break the circular wait

abort all the process in the system

preempt all resources from all processes

none of the mentioned

Discussion

MCQ

What is a semaphore?

is a binary mutex

must be accessed from only one process

can be accessed from multiple processes

none of the mentioned

Discussion

MCQ

If no cycle exists in the resource allocation graph ____________

then the system will not be in a safe state

then the system will be in a safe state

all of the mentioned

none of the mentioned

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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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