Web Development Fundamentals Quiz

Question 1 of 75

What is the relationship between JavaScript and jQuery?

jQuery is an advanced version of JavaScript
JavaScript is an advanced version of jQuery
jQuery is a different language used for MySQL query
jQuery is a JavaScript framework
JavaScript is a scripting framework for jQuery

Question 2 of 75

What does the below statement evaluate to, in JavaScript?

"1" + 2 + "3" + 4;

10
46
1234
37
Error

Question 3 of 75

What does the below statement evaluate to in JavaScript?

4 + 3 + 2 + "1"

10
4321
91
Error

Question 4 of 75

In a contact form, to validate an email address and a phone number field, what can you use from the following options?

HTML
JavaScript
PHP
CSS

Question 5 of 75

If you add a JavaScript validation on a contact form, do you need to validate data again in PHP?

No. That will be a duplication of efforts.
No. Validation can be done in JavaScript only. Not in PHP.
Yes. Client-side validation cannot be trusted.
Yes. PHP also supports validation.

Question 6 of 75

Can we change CSS properties’ values using JavaScript or jQuery?

No. They are different languages.
Possible using jQuery but not possible using JavaScript
We can only change CSS properties’ values if they are set using JavaScript or jQuery originally.
Possible using JavaScript but not possible using jQuery
Yes

Question 7 of 75

JavaScript can be used in?

Client-side scripting
Server-side programming
Command-line applications
Desktop applications
Mobile applications
Machine Learning

Question 8 of 75

Can a user disable JavaScript in the browser?

Yes
No
Depends on the server setting
Depends on the JavaScript version

Question 9 of 75

What will be output of the following code?

function sample() {
throw “Catch it”;
}

try {
console.log( “Started..” );
sample();
console.log( “Finished..” );
} catch( err ) {
console.log(err);
}finally {
console.log( “Wrapping up…” );
}

Started.. Catch it Wrapping up..
Started.. Wrapping up.. Catch it
Catch it Started.. Wrapping up..
Error

Question 10 of 75

With jQuery, What gets selected with selector: `$(“div.intro”)`

All div elements with id="intro"
The first div element with class="intro"
The first div element with id="intro"
All div elements with class="intro"

Question 11 of 75

What is the relationship between XHTML and XML?

XHTML is subset of XML
XML is subset of XHTML
XML and XHTML are same
There is no such thing as XHTML

Question 12 of 75

Difference between HTML id and class?

ID is numeric, the class can contain letters
ID is for unique ids and class is used for objects
ID will refer to a single element, the class can refer to multiple elements
ID and class can be used interchangeably
In the CSS, a class selector is preceded by a full stop (.) and an ID selector is preceded by a hash character (#)

Question 13 of 75

What is the difference between inline and block elements?

A block element always starts on a new line and takes up the full width available but inline doesn’t.
An inline element takes full width, block element doesn’t
Inline elements can be used for one-line text only
A block level element has a top and a bottom margin, whereas an inline element does not.

Question 14 of 75

What is the purpose of DOCTYPE?

It is an instruction to the browser about what version of the markup language the page is written in.
It is an HTML tag used to normalize browser styles
It is a new document format
It is a document's mime type

Question 15 of 75

In HTML, are width="100" and width="100%" the same things?

Yes
No
Depends on the HTML version
Depends on browser

Question 16 of 75

How can we resize the image in HTML?

Using width attribute
Using size attribute
Using resize attribute
Using height attribute

Question 17 of 75

In HTML, which statement(s) is/are true regarding <div> and <span> tag?

<div> is inline element
<span> is block element
<div> is block element
<span> is inline element
Both are inline elements
Both are block elements

Question 18 of 75

How can you access an HTML element with an id attribute, using JavaScript?

Only possible using jQuery, not possible using plain JavaScript
No, not possible at all
Using named access on window object
Using getElementbyId method

Question 19 of 75

What is a box model in CSS?

It is the way the browser allocates space for HTML elements
It is a CSS3 feature used to draw a box
Nothing related to CSS
The box is a CSS property

Question 20 of 75

In CSS, in the “Box Model”, a box consists of?

Actual content
Margins
Borders
Padding

Question 21 of 75

In CSS, what is the difference between margin and padding?

They are both used to add space around elements. Can be used interchangeably
Margin is used for height and padding is the width
Margin is used for width and padding is the height
Margin is space out side the border-box and padding is space between the content and border
Margins can collapse but padding don’t collapse

Question 22 of 75

What are media queries?

Variant of MySQL Query
Variant of jQuery
It helps us make a website mobile-friendly
XQuery successor

Question 23 of 75

What is the purpose of making your design responsive?

To make website response to touch events on mobile devices.
To adjust web design based on device width.
To collect user response.
There is no such thing as responsive design.

Question 24 of 75

In CSS, what is the difference between visibility: hidden and display: none?

The element will be hidden, but still, affect the layout. visibility:hidden preserve the space, whereas display: none doesn't preserve the space
The element will be hidden, but still, affect the layout. display: none preserve the space, whereas visibility: hidden doesn't preserve the space
Both will preserve the space
Neither will preserve the space

Question 25 of 75

In CSS, what is “clearfix” and what problem does it fix?

Force element to self-clear its children
Clearfix clear the sibling’s elements
Fixed the HTML layout
Fixed the browser-specific styles

Question 26 of 75

In CSS, what is the difference between float and text-align?

"text-align" applies to the content of a box, while "float" applies to the box itself.
"float" applies to the content of a box, while "text-align" applies to the box itself.
“float” is the opposite of “text-align”
“float” and “text-align” are same thing

Question 27 of 75

In CSS, what is the purpose of float:center?

To center text.
To center image.
To center entire page.
float doesn’t have “center” value.

Question 28 of 75

In CSS, margin collapsing only happens with…

The vertical margins of block elements in the normal flow.
The vertical margins of inline elements in the normal flow.
The horizontal margins of block elements in the normal flow.
The horizontal margins of inline elements in the normal flow.

Question 29 of 75

In CSS, which property controls the text size?

font-style
text-style
font-size
text-size

Question 30 of 75

In CSS, what does the #log>span code snippet mean?

Span child after log declaration.
Specific span child of id greater than log.
Logs "span" to the console.
Any span child of the element with id as log.

Question 31 of 75

In CSS, what value is given for the left margin in the following code snippet?

margin: 5px 10px 3px 8px;

5px
10px
3px
8px

Question 32 of 75

In CSS, what z-index would you give to an HTML positioned element to make it stack on top of another positioned element that has a z-index of 1?

0
-1
2
10
100

Question 33 of 75

Stack can be used for?

Recursion
Function Calls/Return mechanism
To implement first in, last out data structure
To implement first in, first out data structure

Question 34 of 75

Queue can be used for?

Scheduling jobs/tasks
Recursion
To implement first in, last out data structure
To implement first in, first out data structure

Question 35 of 75

Which is better: Array or Linked List?

An array is always better as it takes less space
A linked list is always better as it can grow as per needs
It depends on application/use-case
Doubly linked list is the best

Question 36 of 75

Whenever a user uploads a video to Youtube, Youtube sends them an email once their video gets converted. While waiting for the CPU to get free, what data structure likely holds the data for video conversion requests?

Array
Linked List
Queue
Stack

Question 37 of 75

What is the difference between hashing and encryption?

Hashing is used to store data, while encryption is used to manipulate data
Hashing can be used to compute the signature, while encryption can be used to transfer data securely
Hashing is better than encryption
Encryption is better than hashing

Question 38 of 75

How will you prefer to store passwords in an application?

Synchronous encryption
Asynchronous encryption
Hash function
Hash function with salts

Question 39 of 75

How will you prefer to store a private file securely for yourself?

Synchronous encryption
Asynchronous encryption
Hash function
Hash function with salts

Question 40 of 75

How will you prefer to transfer a private file securely to a friend?

Synchronous encryption
Asynchronous encryption
Hash function
Hash function with salts

Question 41 of 75

Is it better to always encrypt data?

Yes. Why compromise security!
Only if we need to protect data
No. Encryption cannot be trusted anyway
It’s better to use a hash function

Question 42 of 75

Why “reset password” feature on many websites does not give you your original password?

They are prohibited to do so because of privacy laws
A secure website doesn’t store your original password
This is an IEEE security standard that website follows to become standard compliant
When we forget our password, websites also forget it

Question 43 of 75

What is true for HTTPS?

An attacker cannot intercept HTTPS traffic
HTTPS has performance overhead compared to HTTP
HTTPS protect users from phishing attack
An attacker cannot make sense of HTTPS traffic even if is intercepted

Question 44 of 75

Which statement(s) is/are true for domain names and IP addresses mapping?

One domain name can point to only one IP address only.
One IP address can be used only one domain name.
One domain name can point to multiple IP addresses.
One IP address can be used by multiple domain names.

Question 45 of 75

In a client-server application, is it always recommended to compress data before transfer?

Yes. CPUs are fast. Networks are slow.
Yes. Compression is always good.
Only if compression reduces the size of data considerably.
Only if the network supports compressed data transfer.

Question 46 of 75

What technology a site like Facebook can use for a live chat feature?

Polling server for new messages
Some kind of sockets
New TCP/IP version
Message Protocol

Question 47 of 75

How Google search manages to return results so fast?

It has a very fast super-computer
It indexes web pages in advance
It uses fiber optics for networks
It uses its trademark Pagerank algorithm

Question 48 of 75

What can be PHP used for?

Command-line applications
Web sites
Web applications
Desktop applications
Machine learning

Question 49 of 75

Can we use PHP to write command-line scripts?

No. PHP is used for websites only.
No. PHP is used on servers only.
Only from PHP version 5.6. It’s a new feature.
Yes

Question 50 of 75

Which programming language is better?

PHP
Python
JavaScript
Java
It depends on requirement and expertise of programer

Question 51 of 75

How do we speed up/improve the performance of a web application?

Use better hardware for server infrastructure
Use caching
Write better codes
Add inline comments in the code

Question 52 of 75

Can we upload a file of any size to a PHP application?

Yes. Since PHP 7
Depends on configuration
If we specify unlimited file size in the HTML header
Depends on file type being uploaded

Question 53 of 75

Can we draw images using PHP?

Only if the server has a graphic card
Only if the PHP GD library is present
Yes. Some PHP libraries make the job easy but we can do it anyway.
Yes. Since PHP 7

Question 54 of 75

In PHP, can we use $_GET and $_POST interchangeably?

Yep. They contain the same data.
Depends on the PHP version.
Depends on the HTML version
No. They contain different data.

Question 55 of 75

Which of the following attributes is needed for file upload via a form?

enctype='multipart/form-data'
enctype='singlepart/data'
enctype='file'
enctype='form-data/file'

Question 56 of 75

In PHP, which superglobal variable holds information about headers, paths, and script locations?

$_SERVER
$_GET
$_POST
$_INFO

Question 57 of 75

True or False? In PHP, the setcookie() function must appear BEFORE the <html> tag.

False
True
Does not matter
There is no setcookie() function in PHP

Question 58 of 75

In PHP, which operator should be used to check if two variables are identical?

==
===
eq
=

Question 59 of 75

Which PHP function can help prevent cross-site scripting?

addslashes()
htmlspecialchars()
strip_tags()
quotemeta()

Question 60 of 75

How can you redirect a client to another page using PHP?

header('Location: /another_page.php');
redirect('Content-Location: /another_page.php');
redirect('Location: /another_page.php');
goto('Location: /another_page.php');

Question 61 of 75

Under which circumstances the $_SESSION super-global is available?

If session_start() was called
Always available in PHP 5
If a valid session id is passed via GET, POST or COOKIE
If register_globals are enabled

Question 62 of 75

In a client-server application, in response to an AJAX call, what possible data a PHP script can return?

Text
HTML
Images
Audio
Video
XML
JSON

Question 63 of 75

Is it compulsory to have a MySQL database when building websites with PHP?

Yes. Because PHP works with MySQL only.
Yes. Because we need a database.
No. It is not compulsory.
PHP cant use MySQL

Question 64 of 75

Can PHP session work without browser cookies?

No. Cookies are required to store session id
Yes. Browsers use local storage to store session id by default.
Yes. By appending session id in URLs.
Yes. Session is server side concept and dont depend on any browser aspect

Question 65 of 75

How PHP can be used in an AJAX application?

Can not be used at all as AJAX is asynchronous JavaScript and XML.
Can not be used because AJAX came after PHP
PHP can be used on the server-side to respond to AJAX calls
PHP can be used on the client-side to make AJAX calls

Question 66 of 75

Is it compulsory for a server to respond in XML to an AJAX call?

Yes. AJAX = Asynchronous JavaScript And XML. So the server must return XML as a response.
Yes. XML is the only way a server can respond anyway.
No. The Server can send a non-XML response.
Depends on server configuration.

Question 67 of 75

Complete the sentence: “Sanitizing user-submitted data in PHP, before inserting into MySQL….”

is not required if we have JavaScript validation.
is not compulsory but highly recommended.
is compulsory as that is why we process data in PHP.
is required if JavaScript is disabled.
there is no such thing called sanitization.

Question 68 of 75

Which statement(s) is/are true about MySQL indexes?

SELECT queries will be faster
INSET queries will be faster
SELECT queries will be slower
INSERT queries will be slower

Question 69 of 75

In MySQL, why is row-level locking better than table-level locking?

There is no such thing as row-level locking
There is no such thing as table-level locking
Two processes can simultaneously lock different row without blocking each other
Actually, table-level locking is better as it prevents the complete table from crashing. Row-level locking safeguards only a row.

Question 70 of 75

Can we use MySQL in an application when not following the MVC design pattern?

No. M in MVC stands for MySQL.
No. You need Model from MVC to access MySQL.
Yes. As long as we use a PHP framework which handles MySQL connection.
Yes. Connecting to MySQL don’t depend on design patterns of applications.

Question 71 of 75

Difference(s) between a cron job and a background job?

They are the same thing
Cron job trigger based on time, background job are often event-driven
Cron job uses stack, background job uses queue
Cron job uses queue, background job uses stack

Question 72 of 75

What can go wrong when with a PHP script handling a web request?

Timeout — exceeds max execution configured on server
Memory limit — exceeds memory limit configured on server
Disk error — attempts to make a local file read/write which can fail
Network error — makes an upstream API call which fails

Question 73 of 75

Which statement(s) is/are true for HTTP GET and POST requests?

Request parameters are visible in the URL for the GET request. HTTP POST request parameters are not visible in the URL.
GET requests can handle limited data. POST requests can handle generally much large input data.
Login forms should use HTTP POST requests for security.
Search forms should use HTTP GET so result pages can be bookmarked.
It doesn't matter if we replace HTTP GET with POST or vice-versa.

Question 74 of 75

You are downloading tweets from Twitter API. Twitter API has rate limits. How would you wait/sleep in the code?

Sleep after/before every request
Keep track of API limits and do bookkeeping
Run the script multiple times, in parallel, to get around the API limit
Use parallel processing within the script, to get around the API limit

Question 75 of 75

Can we do animation using only CSS without using JavaScript or jQuery?

No. We will need JavaScript to animate things.
Yes. Only if Flash or OpenGL is installed.
Yes. CSS alone can do some animation.
No. We will need jQuery to animate things

Web Development Fundamentals Quiz

Web Development Fundamentals Quiz

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