Questions.txt

Q1:What is implicit & explicit type casting?
A: implicit casting: compiler understands the casting from 1 data type to the other.
explicit casting: programmer makes the forced casting
e.g: int b= (float) 3;

Q2:Why is Java a platform independent language? 
Q3:What do you understand by an instance variable and a local variable?
A : Instance variable : variable that is declared in a class but outside a method.
Local variable : variable declared within a method or a constructor.
Q4:What is the difference between JDK, JRE, and JVM?
Q5:What are the various access specifiers in Java?
Q6:What is difference between SQL and NoSQL Databases?
Q7:What is XML?
Ans: The Extensible Markup Language (XML) is a simple text-based format for representing structured information: documents, data, configuration, books, transactions, invoices, and much more.

Q8:Define Clustering in Machine Learning.
Ans:Clustering or cluster analysis is a machine learning technique, which groups the unlabelled dataset. It can be defined as "A way of grouping the data points into different clusters, consisting of similar data points.


Q9:What is Singleton Design Pattern?
A: Use the Singleton pattern when a class in your program should have just a single instance available to all clients; for example, a single database object shared by different parts of the program.
 The Singleton pattern disables all other means of creating objects of a class except for the special creation method.
Q10:What is Brust Time?

A:  Burst Time refers to the time required in milli seconds by a process for its execution. The Burst Time takes into consideration the CPU time of a process.
    The I/O time is not taken into consideration. It is called as the execution time or running time of the process.
Q11:What is Hadoop?

Ans: Apache Hadoop is a collection of open-source software utilities that facilitates using a network of many computers to solve problems involving massive amounts of data and computation. It provides a software framework for distributed storage and processing of big data using the MapReduce programming model.

Q12:Write a query to get all the Students from student tabel in oracle.
Q13:What is an ER diagram?
Q14:What is numpy?
A: NumPy is a library for the Python programming language, adding support for large, multi-dimensional arrays and matrices, along with a large collection of high-level mathematical functions to operate on these arrays
Q15:what is pandas?
A: pandas is a software library written for the Python programming language for data manipulation and analysis. In particular, it offers data structures and operations for manipulating numerical tables and time series