Welcome to the Basics of JavaScript MCQs Page

Dive deep into the fascinating world of Basics of JavaScript with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Basics of JavaScript, a crucial aspect of JavaScript. In this section, you will encounter a diverse range of MCQs that cover various aspects of Basics of JavaScript, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within JavaScript.

Check out the MCQs below to embark on an enriching journey through Basics of JavaScript. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of JavaScript.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Basics of JavaScript. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Basics of JavaScript MCQs | Page 2 of 7

Explore more Topics under JavaScript

01

Arrays and Functions

02

Classes and Modules

03

Server Side and Client Side Scripting

04

Document Object Model and Event Handling

05

Graphics and Rendering

06

Performance Measures in JavaScript

07

Socket Programming with JavaScript

08

Parsing, Benchmarking and Logging

09

Invocation and Performance

10

Caching and Debugging

11

JavaScript Animation

Q11.

The type of a variable that is volatile is

Volatile variable

Mutable variable

Immutable variable

Dynamic variable

Discuss

Answer: (b).Mutable variable

Q12.

A hexadecimal literal begins with

Both 0x and 0X

Discuss

Answer: (d).Both 0x and 0X

Q13.

The generalised syntax for a real number representation is

[digits][.digits][(E|e)[(+|-)]digits]

[digits][+digits][(E|e)[(+|-)]digits]

[digits][(E|e)[(+|-)]digits]

[.digits][digits][(E|e)[(+|-)]digits]

Discuss

Answer: (a).[digits][.digits][(E|e)[(+|-)]digits]

Q14.

When there is an indefinite or an infinity value during an arithmetic value computation, javascript

Prints an exception error

Prints an overflow error

Displays "Infinity"

Prints the value as such

Discuss

Answer: (c).Displays "Infinity"

Q15.

Which of the following is not considered as an error in JavaScript?

Syntax error

Missing of semicolons

Division by zero

All of the mentioned

Discuss

Answer: (c).Division by zero

Q16.

The escape sequence "f" stands for

Floating numbers

Representation of functions that returns a value

f is not present in JavaScript

Form feed

Discuss

Answer: (d).Form feed

Q17.

The snippet that has to be used to check if "a" is not equal to "null" is

if(a!=null)

if (!a)

if(a!null)

if(a!==null)

Discuss

Answer: (d).if(a!==null)

Q18.

The statement a===b refers to

Both a and b are equal in value, type and reference address

Both a and b are equal in value

Both a and b are equal in value and type

There is no such statement

Discuss

Answer: (c).Both a and b are equal in value and type

Q19.

Assume that we have to convert "false" that is a non-string to string. The command that we use is (without invoking the "new" operator)

false.toString()

String(false)

String newvariable="false"

Both false.toString() and String(false)

Discuss

Answer: (d).Both false.toString() and String(false)

Q20.

Consider the following snippet code:

var string1 = "123";
var intvalue = 123;
alert( string1 + intvalue );

The result would be

123246

246

123123

Exception

Discuss

Answer: (c).123123

Page 2 of 7

Welcome to the Basics of JavaScript MCQs Page

Basics of JavaScript MCQs | Page 2 of 7

Explore more Topics under JavaScript

Arrays and Functions

Classes and Modules

Server Side and Client Side Scripting

Document Object Model and Event Handling

Graphics and Rendering

Performance Measures in JavaScript

Socket Programming with JavaScript

Parsing, Benchmarking and Logging

Invocation and Performance

Caching and Debugging

JavaScript Animation

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