JavaScript MCQ Quiz - Objective Question with Answer for JavaScript - Download Free PDF

Node.js

• Node.js is a platform that allows developers to write server-side JavaScript applications using the same language and runtime environment as front-end web development.
• Node.js comes with several built-in modules that provide functionality for common tasks, such as working with files (fs), creating HTTP servers (http), and managing file paths (path).
• These built-in modules can be used in Node.js applications without any additional installation.

mysql module

• The mysql module, on the other hand, is not a built-in module in Node.js.
• It is a third-party module that provides a way for Node.js applications to communicate with MySQL databases.
• In order to use the mysql module, it must be installed separately via the npm (Node Package Manager) tool, which is included with Node.js.
• This can be done by running the command 'npm install mysql' in a terminal or command prompt window.

Hence, the correct answer is option 3.

Spares - There is no such term related to arrays in programming.

Danes - There is no such term related to arrays in programming.

Regular - A regular array is a 2D array where each row has the same number of elements.

Irregular - An irregular array, also known as a jagged array, is a 2D array where each row can have a different number of elements. This type of array can be useful in situations where you have data that does not fit neatly into a rectangular shape, such as when dealing with data of varying lengths or when representing a hierarchical structure. In C++, an irregular array can be implemented as an array of arrays, where each sub-array can have a different size.

• A 2D array having a different number of elements in each row is known as an "irregular" array.

The correct answer is option 3.

Concept:

• In JavaScript "= = =" operator defines Is identical (is equal to and is of the same type). 
• The === operator in javascript compares the equality of two operands with type.
• If both type and value are equal, the condition is true; otherwise, it is false. 
• In javascript, the equality operator is used to check if two values are equal. In javascript, the comparison is done with the == and === operators.
• The fundamental difference between the == and === operators in javascript is that the == operator converts the operands' types before comparing them, whereas the === operator compares the operands' values as well as their data types.
• The type conversion of the operand is the major difference between == and === in Javascript.

Syntax for equality:

x === y

Example:

let a = 10;

let b = '10';

let c = 10;

console.log(a===b); //output: false;

console.log(a===c); //output: true;

Syntax for equality:

x == y

Example:

let a = 10;

let b = '10';

let c = 10;

console.log(a===b); //output: true;

console.log(a===c); //output: true;

Hence the correct answer Is identical (is equal to and is of the same type).

Answer: Option 2

Concept:

• The JavaScript Programming language came into existence in 1995.
• JavaScript is a programming language used in web development.
• It was developed by Netscape to add dynamic and interactive elements to websites. 
• JavaScript is influenced by Java.
• It is a client-side scripting language.
• A JavaScript code can be inserted anywhere within the HTML of a webpage.
• JavaScript is a scripting language that is used to develop websites.
• JavaScript helps to add functionality and behaviors to your website, allowing your website’s visitors to interact with content in many imaginative ways.
• In September 1995, a Netscape programmer named Brandan Eich developed a new scripting language in just 10 days.
• It was originally named Mocha, but quickly became known as LiveScript and, later, JavaScript.

Explanation:

The Behaviour Of Operator “+” in JavaScript:

If any of the operands is a string, all others are converted to a string, and concatenation is done, otherwise, arithmetic addition is done.

for example if the var x =  16+ "Volvo"+ 4; is given then output will be 16Volvo4.

Answer: Option 3

Concept:

• The write() method writes HTML expressions or JavaScript code to a document
• In Javascript, document.write(" ") at client side and response.write on server side

​Additional Information

innerHTML: 

This property used to return/set the content of any HTML element.

console.log(): 

This method is used to write output to the browser's console.

This is generally used while testing the web application.

window.alert(): 

This method is used to display a dialog box to the user to alert the user about something.

An alert dialog box is mostly used to give a warning message to the users. 
for example, an input field requires to enter some text but the user does not enter that field then as a part of validation we can use alert box to give warning message.

The correct answer is text/JavaScript.

Key Points

• The programming language JavaScript is one of the foundational elements of the World Wide Web. 
• JavaScript is an ECMAScript-compliant high-level, frequently just-in-time compiled language.
• It features first-class functions, prototype-based object orientation, and dynamic typing.
• It supports event-driven, functional, and imperative programming paradigms and is a multi-paradigm.
• It offers application programming interfaces (APIs) for using the Document Object Model, regular expressions, dates, and standard data structures.

Additional Information

• ECMAScript:
  • A JavaScript standard called ECMAScript was created to guarantee browser compatibility for web pages.
• VBScript:
  • Microsoft created VBScript, an Active Scripting language based on Visual Basic. 

The correct answer is Kerala.

• Kerala has linked with Himachal Pradesh under Ek Bharat Shreshtha Bharat.
• The program aims to actively enhance interaction between people of diverse cultures living in different States and UT's in India.
• This is a part of Ek Bharat Shrestha Bharat activities, Ministry of Tourism.

Important Points

​ 

Key Points

•  The mission of Ek Bharat Shreshtha Bharat:
  • ​To Celebrate the Unity in the Diversity of our Nation and to maintain and strengthen the fabric of traditionally existing emotional bonds between the people of our Country.
  • To promote the spirit of national integration through a deep and structured engagement between all Indian States and Union Territories.
  • To Showcase the rich heritage and culture, customs, and traditions of either State for enabling people to understand and appreciate the diversity that is India.
  • To establish long-term engagements and, to create an environment that promotes learning between States/UTs by sharing best practices and experiences.

The correct answer is “option 2”.

Concept:

• The write() method writes HTML expressions or JavaScript code to a document
• In javascript, document.write(" ") at client side and response.write on server side

Explanation:

All options 1, 3 & 4 are having the wrong syntax.

Hence, the correct syntax is response.write("Hi There").

The correct answer is text/JavaScript.

Key Points

• The programming language JavaScript is one of the foundational elements of the World Wide Web. 
• JavaScript is an ECMAScript-compliant high-level, frequently just-in-time compiled language.
• It features first-class functions, prototype-based object orientation, and dynamic typing.
• It supports event-driven, functional, and imperative programming paradigms and is a multi-paradigm.
• It offers application programming interfaces (APIs) for using the Document Object Model, regular expressions, dates, and standard data structures.

Additional Information

• ECMAScript:
  • A JavaScript standard called ECMAScript was created to guarantee browser compatibility for web pages.
• VBScript:
  • Microsoft created VBScript, an Active Scripting language based on Visual Basic. 

Answer: Option 3

Concept:

• The write() method writes HTML expressions or JavaScript code to a document
• In Javascript, document.write(" ") at client side and response.write on server side

​Additional Information

innerHTML: 

This property used to return/set the content of any HTML element.

console.log(): 

This method is used to write output to the browser's console.

This is generally used while testing the web application.

window.alert(): 

This method is used to display a dialog box to the user to alert the user about something.

An alert dialog box is mostly used to give a warning message to the users. 
for example, an input field requires to enter some text but the user does not enter that field then as a part of validation we can use alert box to give warning message.

The correct answer is Kerala.

• Kerala has linked with Himachal Pradesh under Ek Bharat Shreshtha Bharat.
• The program aims to actively enhance interaction between people of diverse cultures living in different States and UT's in India.
• This is a part of Ek Bharat Shrestha Bharat activities, Ministry of Tourism.

Important Points

​ 

Key Points

•  The mission of Ek Bharat Shreshtha Bharat:
  • ​To Celebrate the Unity in the Diversity of our Nation and to maintain and strengthen the fabric of traditionally existing emotional bonds between the people of our Country.
  • To promote the spirit of national integration through a deep and structured engagement between all Indian States and Union Territories.
  • To Showcase the rich heritage and culture, customs, and traditions of either State for enabling people to understand and appreciate the diversity that is India.
  • To establish long-term engagements and, to create an environment that promotes learning between States/UTs by sharing best practices and experiences.

Concept:

If you are using Page Output Caching By default, a page is cached in three locations: web server, any proxy servers, and browser.Location attribute is used in <%@ OutputCache %> directive to specify where a page is cached.

This attribute has the following values:

• Any
• Client
• Downstream
• None
• Server
• ServerAndClient

Answer: Option 3

Explanation:

Option 1: < Div > and < / Div >

This is not correct. as this pair used to create a division in an HTML page/document. 

Option 2: < Body > and < / Body >

This is not correct. as body tag used to define the body of HTML page.

Option 3: ​

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