(SEM V) THEORY EXAMINATION 2020-21 WEB TECHNOLOGY

WEB TECHNOLOGY (KIT501)

B.Tech (SEM-V) – AKTU

SECTION A

(Attempt all questions – 2 × 10 = 20 marks)

Q1 (a) How is an object created in Java?

In Java, an object is created using the new keyword. The new keyword allocates memory for the object and calls the constructor of the class to initialize it.
Example:
ClassName obj = new ClassName();

Q1 (b) Compare between JDK, JRE and JVM.

JDK (Java Development Kit) is used for developing Java applications and includes JRE and development tools.
JRE (Java Runtime Environment) provides libraries and environment to run Java programs.
JVM (Java Virtual Machine) executes Java bytecode and makes Java platform independent.

Q1 (c) Differentiate between HTML and XML.

HTML is used to design and display web pages, while XML is used to store and transport data.
HTML has predefined tags, whereas XML allows user-defined tags.
HTML focuses on presentation, XML focuses on data structure.

Q1 (d) Write a program with external style sheet using CSS.

An external CSS file is linked to an HTML document using the <link> tag.
The CSS file contains styling rules that can be applied to multiple web pages.

Q1 (e) Compare between Internet and WWW.

The Internet is a global network of connected computers.
The World Wide Web is a service running on the Internet that allows access to web pages using browsers.

Q1 (f) How HTTPS is different from HTTP?

HTTP transfers data in plain text and is not secure.
HTTPS uses SSL/TLS encryption to secure data, making it safe for sensitive information.

Q1 (g) Difference between JDBC and ODBC.

JDBC is a Java-based API used to connect Java applications with databases.
ODBC is language independent and can be used by various programming languages.

Q1 (h) What are JAR and Manifest files?

A JAR file is a package file format used to bundle Java classes and resources.
A Manifest file contains metadata about the JAR file such as main class and version information.

Q1 (i) Compare doGet() and doPost() method.

doGet() sends data through URL and is less secure.
doPost() sends data in request body and is more secure for sensitive data.

Q1 (j) Write difference between JSP and Servlet.

Servlets are Java programs that generate dynamic content using Java code.
JSP is easier to use for presentation and is converted internally into a Servlet.

SECTION B

(Attempt any three – 3 × 10 = 30 marks)

Q2 (a) How is exception handled in Java? Differentiate throw and throws.

Exception handling in Java is done using try, catch, finally, throw, and throws.
The try block contains risky code, catch handles exceptions, and finally executes compulsory code.

The throw keyword is used to explicitly throw an exception.
The throws keyword declares exceptions that a method may pass to the calling method.

Q2 (b) Explain HTML tags for Tables, Frames, and Forms with examples.

HTML tables are created using <table>, <tr>, <td>, and <th> tags to display data in rows and columns.
Frames divide the browser window into multiple sections using <frameset> and <frame>.
Forms are created using <form> tag and include input elements like text fields, radio buttons, and submit buttons.

Q2 (d) Write steps to connect database with web application using JDBC.

First, load the JDBC driver.
Then establish a connection using DriverManager.
Create a statement object to execute SQL queries.
Execute the query and process the result set.
Finally, close the connection.

SECTION C

(Attempt any two – one from each unit, 2 × 10 = 20 marks)

Q3 (a) What do you understand by web technology? Explain web protocols and working of HTTP.

Web technology refers to tools and technologies used to develop websites and web applications.
Protocols such as HTTP, HTTPS, FTP, and SMTP help communication over the web.

HTTP works on a request-response model where the client sends a request and the server responds with data such as HTML pages.

Q7 (a) Explain Servlets with its Life Cycle. How is it different from JSP life cycle?

A Servlet is a Java program that runs on a web server to handle client requests.
The Servlet life cycle includes loading, initialization, request handling, and destruction.

JSP life cycle is different as JSP pages are first translated into Servlets and then executed. JSP focuses more on presentation while Servlets focus on business logic.