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).

Concept:

Division of any integer by zero is not an error in the JavaScript. It just prints the infinity as a result. However, there is an exception in JavaScript, dividing zero with zero will not have any defined number/value so, the result of this specific operation is a special value "Not a Number" (or NaN) and printed as NaN.

Concept:

The date and time functions provide capabilities for querying and returning results about calendar information and time values and durations.

Date and time comparisons

Three types are associated with the date and time functions: date, time, and timestamp.

day() function

The day() function returns the numeric value of the day of the month of a specified date.

days_between() function

The days_between() function determines the truncated number of full days between two time stamps.

hour() function

The hour() function determines the hours value in a specified time.

hours_between() function

The hours_between() function determines the truncated number of full hours between two time stamps.

minute() function

The minute() function determines the minutes value in a specified time.

minutes_between() function

The minutes_between() function determines the truncated number of full minutes between two time stamps.

month() function

The month() function determines the month in a specified date.

next_week() function

The next_week() function determines the first day of the next week after a specified date. Sunday is considered the first day of that new week.

next_month() function

The next_month() function determines the first day of the next month after a specified date.

next_quarter() function

The next_quarter() function determines the first day of the next quarter after a specified date.

next_year() function

The next_year() function determines the first day of the next year after a specified date.

second() function

The second() function determines the seconds value in a specified time.

seconds_between() function

The seconds_between() function determines the truncated number of full seconds between two time stamps.

this_month() function

The this_month() function determines the first day of the month of a specified date.

this_quarter() function

The this_quarter() function determines the first day of the quarter of a specified date.

this_week() function

The this_week() function determines the first day of the week in a specified date.

this_year() function

The this_year() function determines the first day of the year of a specified date.

weeks_between() function

The weeks_between() function determines the truncated number of full weeks between two time stamps.

year() function

The year() function determines the year of a specified date.

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 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 “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 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 1 i.e. FALSE

Key PointsJavaScript is mainly known as an object-oriented scripting language, but it also supports other programming paradigms such as procedural and functional programming. Therefore, saying that JavaScript is only object oriented is false.

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.

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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