Which of the following is not a multitasking operating system ?

a-       Windows

a-       Linux

a-       Win NT

a-       DOS

Which one is not a system tool?

a-       Backup

a-       Disk defragment

a-       Virus scanning

a-       All of the above

Which of the following is the correct definitions of a valid process transition in an OS?

Wake:ready,running

Dispatch:ready,running

Block:ready,blocked

Timer runs out:ready,blocked

The _________ provides so many facilities with which a user comfortably uses their computers.

 ALU

Working System

Operating System

None

Round robin is a

Kind of magnetic drum

 Memory allocation policy

Process scheduling policy

Process synchronization policy

Which command is used to clear the screen and display the operating system prompt on the first line of the display?

Cd

 Md

 Cls

 Rename

In the linked list implementation of queue, where will the new element be inserted?

At the middle position of the linked list

At the head position of the linked list

At the tail position of the linked list

None of the above

Given an empty stack, after performing push (1), push (2), Pop, push (3), push (4), Pop, Pop, push(5), Pop, what is the value of the top of the stack ?

4

3

2

1

What is the need of DBMS?

Database systems are basically developed for large amount of data. When dealing with huge amount of data, there are two things that require optimization: Storage of data and retrieval of data.

1)Storage: According to the principles of database systems, the data is stored in such a way that it acquires lot less space as the redundant data (duplicate data) has been removed before storage

2)Fast Retrieval of data: Along with storing the data in an optimized and systematic manner, it is also important that we retrieve the data quickly when needed. Database systems ensure that the data is retrieved as quickly as possible

3)Purpose of Database Systems :The main purpose of database systems is to manage the data. Consider a university that keeps the data of students, teachers, courses, books etc. To manage this data we need to store this data somewhere where we can add new data, delete unused data, update outdated data, retrieve data, to perform these operations on data we need a Database management system that allows us to store the data in such a way so that all these operations can be performed on the data efficiently.

New nodes are added to the ____ of the queue.

 Front

Back

Middle

 Both A and B