Explain relationship between two tables.

Q1. Explain the relationship between two tables through an example.

Ans. The Employees_Details table contains the following fields:


E_Code E_Name E_Address E_ContNo E_Grade E_Salary


The Department table contains the following fields:


D_ID D_Name E_Code E_Name Design S_Scale


The relationship between these two tables is created on the basis of a common field named E_Code. A relationship between these tables is established to fetch any information from both the tables. Further, establishing a relationship among tables allows you to link them to get meaningful information.

History of the Internet.

Q24. Write a note on the history of the Internet.

Ans. Over the last two decades, the Internet has gained immense popularity and emerged as an important and efficient means of communication. In 1962, J.C.R. Licklider first proposed the development of a global network of computers. The same year, he moved to Defense Advanced Research Projects Agency (DARPA) to develop the network. Another scientist, Leonard Kleinrock, developed the theory of packet switching, which was used as a basis for the Internet connections. In 1969, the scientists at DARPA succeeded in networking two computers, known as ARPANET (Advanced Research Projects Agency Network), which was based on packet switching. ARPANET was developed as a means of Read More …

How is WWW different from the Internet?

Q26. How is WWW different from the Internet?
Ans. WWW represents an information space where documents and other web resources resides. These documents are connected by hyperlinks and can be accessed by URLs using Internet. WWW makes up a large part of the Internet and consists of websites that have one or more Web pages. On the other hand, computers on the Internet are connected to each other with the help of various small networks. Read More …

Working of the Internet.

Q25. Explain the working of the Internet.
Ans. The computers on the Internet are connected to each other with the help of various small networks. These networks are in turn connected through the gateways to the Internet backbone. There are various steps for transmitting data or information through the Internet.

These steps are described below:

  1. The source computer (the computer that is sending the data) Read More …

What is e-learning and its importance.

Q21. What is e-learning? Explain its importance.
Ans. Electronic learning (e-learning) is the mode of acquiring knowledge by means of the Internet and computer-based training programs.
In this type of education, students learn and study on their own and communicate with their instructors and other students through e-mail messages, electronic forums, video-conferencing, chat rooms, bulletin boards, and messaging. Examples of e-learning comprise different forms of learning like Web-based and computer-based learning and virtual classrooms. E-learning employs a variety of media, such as audio, animation, text and streaming videos to impart learning or training. E-learning is said to be more effective than the traditional classroom learning methods.

Search engine.

Q20. What do you mean by a search engine? Name two popular search engines. What role do search engines play in Web surfing?
Ans. A search engine helps in searching information on the Internet according to the specified criterion. For example, if a user wants to know which universities in Delhi offer management courses, then transform the information requirement into a search criterion and feed it into a search engine. Within seconds, a long list of websites will appear on the monitor, which will provide users with the desired information.

Two popular search engines are as follows:

  • Google
  • Yahoo!

A search engine plays a vital role in Web surfing. The search engines allow users to find information on the Internet on the basis of the specified search criteria. They provide a number of related links when a search query is specified to them thereby allowing the users to visit different Web pages of same or different websites. This continuous search for the information on the Internet is known as Web surfing

Advantages of E-Mail.

Q18. List the advantages of e-mail.
Ans. The following are the main advantages of e-mail:

  • Saves paper and allows users to edit the message easily,
  • Transmits messages faster than other conventional forms of communication, such as speed post and courier service,
  • Allows users to send and receive messages according to their comfort and convenience level, i.e. a user need not go to buy stamps and envelopes and then post the letter in the post office, Read More …

Describe the e-mail service.

Q17. Describe the e-mail service.
Ans. E-mail is one of the most popular and important services provided by the Internet. Today, email has become one of the most widely used tools of communication. Through e-mail, a user can communicate with anyone around the world by sending and receiving electronic messages within seconds. In the 1970s, when the e-mail service had just started, user could only send textual messages. However, today it is possible to send or receive Read More …

Uses of the Internet.

Q16.What are the uses of the Internet?
Ans. Internet has undergone a phenomenal growth since the last decade. From searching for information to downloading music and videos, sending and receiving e-mail messages to communicate with friends, and conducting everyday transactions, the Internet has become an integral part of our lives. The Internet has evolved as a fast and economically feasible mode of communication. Read More …