HTML Interview Questions and Answers

What is HTML?

HTML stands for hypertext mark-up language.

Hyper is the opposite of linear. Old-fashioned computer programs were necessarily linear - that is, they had a specific order. But with a hyper language such as HTML, the user can go anywhere on the web page at any time. Text is just what you're looking at now - English characters used to make up ordinary words. Mark-up is what is done to the text to change its appearance. For instance, marking up your text with <b> before it and </b> after it will put that text in bold. Language is just that. HTML is the language that computers read in order to understand web pages. HTML stands for Hyper Text Markup Language HTML is not a programming language, it is a markup language.

Why we Place all External CSS Files within the Head Tag?

Moving style sheets to the document HEAD makes pages appear to be loading faster. This is because putting style sheets in the HEAD allows the page to render progressively.

What is the simplest HTML page?

HTML Code:

<HTML>

<HEAD> <TITLE>Welcome! </TITLE> </HEAD>

<BODY> Hello world! </BODY>

</HTML>

What is a html tag?

HTML markup tags are usually called HTML tags.
HTML tags are keywords surrounded by angle brackets like <html>.
HTML tags normally come in pairs like <b> and </b>.
The first tag in a pair is the start tag, the second tag is the end tag,
Start and end tags are also called opening tags and closing tags

What is the file extension of html?

The HTML file extension is .htm or .html

What is a hypertext link and how to create it?

A hypertext link is a special tag that links one page to another page or resource. If you click the link, the browser jumps to the link's destination.

The anchor element is used to define the start and/or destination of a hypertext link. A hyperlink (or link) is a word, group of words, or image that you can click on to jump to a new document or a new section within the current document.

Example: The <a href="http://www.webiwip.net/"> webiwip</a>

How can I include comments in HTML?

An HTML comment begins with <!-- , ends with --> .The following are examples of HTML comments: 

<!-- This is a comment. -->
<!-- This is another comment, 
and it continues onto a second line. -->
<!---->

Can I nest tables within tables?

Yes, a table can be embedded inside a cell in another table. Here's a simple example:

<table  border='1'>
      <tr>
          <td>this is the first cell of the outer table</td>
            <td>this is the second cell of the outer table, with the inner table embedded in it
            <table  border='1'>
                    <tr>
                        <td>this is the first cell of the inner table</td>
                        <td>this is the second cell of the inner table</td>
                    </tr>
            </table>
            </td>
        </tr>
</table>
this is the first cell of the outer table this is the second cell of the outer table, with the inner table embedded in it
this is the first cell of the inner table this is the second cell of the inner table
What is html Meta element?

The <meta> tag provides metadata about the HTML document. Metadata will not be displayed on the page. 
Meta elements are typically used to specify page description, keywords, author of the document, last modified, and other metadata.
The <meta> tag always goes inside the head element.
The metadata can be used by browsers (how to display content or reload page), search engines (keywords), or other web services.

What are HTML Lists and html code for list items?

HTML lists are ordered and unordered
An unordered list starts with the <ul> tag. Each list item starts with the <li> tag. 
The list items are marked with bullets (typically small black circles). 

<ul>
<li>Coffee</li>
<li>Milk</li>
</ul> 


An ordered list starts with the <ol> tag. Each list item starts with the <li> tag. 
The list items are marked with numbers. 

<ol>
<li>Coffee</li>
<li>Milk</li>
</ol> 


A definition list is a list of items, with a description of each item. 
The <dl> tag defines a definition list.The <dl> tag is used in conjunction with <dt> (defines the item in the list) and <dd> (describes the item in the list): 

<dl>
<dt>Coffee</dt>
<dd>- black hot drink</dd>
<dt>Milk</dt>
<dd>- white cold drink</dd>
</dl> 
What is a html form?

HTML forms are used to pass data to a server. A form can contain input elements like text fields, checkboxes, radio-buttons, submit buttons and more. Example

<form action="./#" method="get" name="input">Username: <input name="user" type="text" /><br />
<input type="submit" value="Submit" /></form>
 
Can I have two or more actions in the same form?

No. A form must have exactly one action. However, the server-side program that processes your form submissions can perform any number of tasks.

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Height and Distance

An aeroplane flying at a height of 300 m above the ground passes vertically above another plane at an instant when the angles of elevation of the two planes from the same point on the ground are 60º and 45º respectively. What is the height of the lower plane from the ground?

From the top of a building 90 m high, the angles of depression of the top and the bottom of a tree are 30º and 45º respectively. What is the height of the tree?

Trigonometry

What is the value of sinx √( 1 /1+cosx + 1 /1-cosx ) ?

What is cos4 A - sin4 A / cos2 A - sin2 A equal to?

If 7sin2 x +3cos2 x = 4, 0 < x < 90º ,then what is the value of tan x?

If x = a cosθ + b sinθ and y = a sinθ - b cosθ then what is x2 + y2 equal to?

Average

The mean of 5 numbers is 15. If one more number is included, the mean of the 6 numbers becomes 17. What is the included number?

The mean marks obtained by 300 students in a subject are 60. The mean of top 100 students was found to be 80 and the mean of last 100 students was found to be 50. The mean marks of the remaining 100 students are?

In an asymmetrical distribution, of the mean and median of the distribution are 270 and 220 respectively, then the mode of the data is?

Let a, b, c, d, e, f, g be consecutive even numbers and j, k, l, m, n be consecutive odd numbers. What is the average of all the numbers?

Alligation or Mixture

25 kg of alloy X is mixed with 125 kg of alloy Y. If the amount of lead and tin in the alloy X is the ratio 1 : 2 and the amount of lead and tin in the alloy Y is in the ratio 2 : 3, then what is the ratio of lead to tin in the mixture?

Simplification

The ratio of two numbers is 1 : 5 and their product is 320. What is the difference between the square of these two numbers?

Trigonometry

What is the value of cot 4π/3 ?

Indian Politics

Article-24 of the Indian Constitution ‘Prohibition of employment of children in factories, etc’ deals with?

Article-134A of the Indian Constitution ‘Certificate for appeal to the Supreme Court’ deals with?

Chemistry

Who invented Aspirin?

Physics

A larger force on a rotating body results in larger?

What is the unit of the physical quantity, magnetic flux density?