QUIZ ON : javascript - JS INTRODUCTION

JS INTRODUCTION

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Question No# : 01 out of 50

What is the output of the following code let a = 10; let b = "10"; console.log(a == b);

A. true

B. false

C. undefined

D. Error

Question No# : 02 out of 50

Which method is used to display a dialog box that asks for user input

A. alert()

B. confirm()

C. prompt()

D. console.log()

Question No# : 03 out of 50

Which of the following is the correct way to declare a variable in JavaScript

A. let myVar;

B. var myVar;

C. const myVar;

D. All of the above

Question No# : 04 out of 50

Which of the following keywords is used to declare a function in JavaScriptWhich of the following keywords is used to declare a function in JavaScript

A. function

B. def

C. declare

D. func

Question No# : 05 out of 50

Which is Client Side Script Language

A. CSS

B. Python

C. HTML

D. JavaScript

Question No# : 06 out of 50

Which operator is used to concatenate strings in JavaScript

A. +

B. .

C. *

D. &

Question No# : 07 out of 50

JavaScript is designed for following purpose

A. To Perform Server Side Scripting Opertion

B. To Execute Query Related to DB on Server

C. To add interactivity to HTML Pages

D. To Style HTML Pages

Question No# : 08 out of 50

What is the output of the following code let i = 2, j = 3; let result = i++ + ++j; console.log(result); .

A. 5

B. 6

C. 7

D. Error in Code

Question No# : 09 out of 50

What does NaN mean in JavaScript

A. Not a Name

B. Not a Number

C. Null and None

D. Name and Number

Question No# : 10 out of 50

How can you convert a string to an integer in JavaScript

A. int("123")

B. parseInt("123")

C. toInt("123")

D. (int) “123”

Question No# : 11 out of 50

What happens if the condition in a for loop is omitted

A. The loop runs infinitely

B. The loop does not execute

C. The loop throws an error

D. The loop executes once

Question No# : 12 out of 50

What is the correct syntax for a for loop in JavaScript

A. for (initialization, condition, increment/decrement)

B. for {initialization; condition; increment/decrement}

C. for (initialization; condition; increment/decrement)

D. for loop (initialization; condition; increment/decrement)

Question No# : 13 out of 50

Which of the following keywords is used to create an alternative block in an if statement

A. then

B. else

C. elif

D. otherwise

Question No# : 14 out of 50

What does the confirm() function return if the user clicks "OK"

A. true

B. false

C. yes

D. ok

Question No# : 15 out of 50

Which of the following is a correct JavaScript syntax to write "Hello World" on a webpage

A. System.out.println("Hello World");

B. document.write("Hello World");

C. echo("Hello World");

D. print("Hello World");

Question No# : 16 out of 50

What is the output of console.log(5 % 2);

A. 2.5

B. 2

C. 1

D. 5

Question No# : 17 out of 50

What does console.log() do

A. Displays a message box with the text inside

B. Prints output to the web browser

C. Prints output to the browser's console

D. Terminates the script

Question No# : 18 out of 50

Which is the correct syntax to call an external JavaScript file in the current HTML document ?

A. <script src=" test.js"'></script>

B. <script href=" test.js"></script>

C. <import src=" test.js"></import>

D. <script link=" test.js"></script>

Question No# : 19 out of 50

Which operator is used to assign a value to a variable

A. =

B. ==

C. ===

D. .!=

Question No# : 20 out of 50

Which of the following is the correct way to write "Hello World" in an alert box

A. msg("Hello World");

B. alert("Hello World");

C. console.log("Hello World");

D. print("Hello World");

Question No# : 21 out of 50

The extension of JavaScript file is

A. .html

B. .java

C. .js

D. .css

Question No# : 22 out of 50

What does the typeof operator do in JavaScript

A. Checks the type of a variable or expression

B. Converts data to a specific type

C. Creates a new variable type

D. Compares data types

Question No# : 23 out of 50

What is the difference between ++i and i++

A. ++i increments the value after usage, while i++ increments it before

B. ++i increments the value before usage, while i++ increments it after

C. Both are the same

D. i++ is a syntax error.

Question No# : 24 out of 50

How can you skip the current iteration of a loop

A. Use break;

B. Use continue;

C. Use skip;

D. Use return;

Question No# : 25 out of 50

What is the correct syntax for referring to an external script called "data.js"?

A. <script name="data.js">

B. <script href="data.js">

C. <script src="data.js">

D. <link href="data.js">

Question No# : 26 out of 50

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

A. Syntax error

B. Accessing a variable or function that is not defined

C. Division by zero

D. None of these

Question No# : 27 out of 50

How can you change the style of an HTML element in JavaScript

A. element.css.style = "value";

B. element.style.property = "value";

C. element.setStyle("property", "value");

D. element.changeStyle.property = "value";

Question No# : 28 out of 50

What is the alternate name for Java script?

A. LimeScript

B. ECMScript

C. Coffee Script

D. ECMAScript

Question No# : 29 out of 50

Which method is used to access an element by its id in JavaScript

A. document.getElementById()

B. document.getElementByClass()

C. document.querySelector()

D. document.getElementByName()

Question No# : 30 out of 50

What is the output of the following code let result = 10 / 2 * 3; console.log(result);

A. 15

B. 1.5

C. 5

D. Error

Question No# : 31 out of 50

Which company developed JavaScript?

A. Microsoft

B. Sun Microsystems

C. Netscape

D. Oracle

Question No# : 32 out of 50

What is the output of the following code let a = 10; let b = a--; console.log(a, b);

A. 10 10

B. 9 10

C. 9 9

D. 10 9

Question No# : 33 out of 50

Which function is used to call a function repeatedly with a fixed time interval

A. setTimeout()

B. setInterval()

C. repeat()

D. loop()

Question No# : 34 out of 50

Which of the following is a valid JavaScript variable name

A. 2variable

B. variable-2

C. my variable

D. my variable2

Question No# : 35 out of 50

What is the output of the following code let a = 2, b = 3, c = 4; a = b = c; console.log(a, b, c);

A. 243

B. 444

C. 2 2 2

D. 432

Question No# : 36 out of 50

Find the only statement in the following that is correct.

A. JavaScript interpreter processes programs written in Java.

B. JavaScript interpreter processes commands in a script written in JavaScript.

C. Java and JavaScript are almost similar

D. JavaScript cannot be embedded in HTML.

Question No# : 37 out of 50

What happens if no case in a switch statement matches the condition

A. The program throws an error

B. The default case is executed (if defined

C. Contrast

D. None of the above

Question No# : 38 out of 50

Which of the following correctly represents the ternary operator syntax

A. condition ? True statement : false statement

B. condition : true statement ? False statement

C. condition ? (true statement : false statement)

D. condition then true statement else false statement

Question No# : 39 out of 50

JavaScript is a _______ language

A. Compiled

B. Interpreted

C. Markup

D. Styling

Question No# : 40 out of 50

What is JavaScript

A. A programming language for creating static pages

B. A scripting language for creating interactive web pages

C. A styling language for designing web pages

D. A database query language

Question No# : 41 out of 50

What is the associativity of the assignment operator (=)

A. Left-to-right

B. Right-to-left

C. Top-to-bottom

D. Undefined

Question No# : 42 out of 50

Which operator has the highest precedence in JavaScript

A. * (Multiplication)

B. () (Parentheses)

C. ++ (Increment)

D. = (Assignment)

Question No# : 43 out of 50

How do you write a comment in JavaScript

A.

B. # Comment

C. // Comment

D. ** Comment **

Question No# : 44 out of 50

Javascript is _____ language

A. Client Side

B. Server Side

C. Both A and B

D. None of These

Question No# : 45 out of 50

How many times will the following loop execute How many times will the following loop execute? for (let i = 0; i < 5; i++) { console.log(i); }

A. 4

B. 5

C. 6

D. Infinite

Question No# : 46 out of 50

Inside which HTML element do we put the JavaScript?

A. <javascript>

B. <script>

C. <scripting>

D. <link>

Question No# : 47 out of 50

Which operator is used for strict equality comparison in JavaScript

A. =

B. ==

C. ===

D. !=

Question No# : 48 out of 50

Which of the following is equivalent to i += 1

A. i++

B. --i

C. Both a) and b)

D. None of the above

Question No# : 49 out of 50

How do you check if a variable x is not equal to 5 in JavaScript

A. x =! 5

B. x !== 5

C. x != 5

D. Both b) and c)

Question No# : 50 out of 50

What is the correct JavaScript syntax to write Hello World?

A. System.out.println("Hello Word")

B. println ("Hello Word")

C. document.write("Hello Word")

D. response.write("Hello Word")