A website loads slowly due to blocking JavaScript execution in the <head>. How can the developer fix this?

Move the <script> tag to the end of the <body> section

Remove JavaScript from the page

Use multiple inline <script> tags

A web developer wants to execute a small JavaScript function when a button is clicked. Where can the JavaScript code be placed?

Inside the HTML element as an inline onclick attribute

Inside a <script> tag in the <head> section

Inside a <script> tag at the end of the <body> section

A developer includes an external JavaScript file in their webpage using <script src="script.js"></script>, but the script doesn't work. What could be the reason?

The <script> tag is placed in the <head> section, causing JavaScript to load before HTML

The file name is incorrect or the file is missing

A developer wants to display a welcome message on a webpage using JavaScript. Which method is best for displaying text directly inside an HTML element?

document.getElementById("demo").innerHTML = "Welcome!";

A website owner wants to show a pop-up message to visitors when they enter the site. Which JavaScript method should be used?

document.write("Welcome to our site!");

console.log("Welcome to our site!");

innerHTML("Welcome to our site!");

A developer needs to debug their JavaScript code by printing messages to the browser’s console. Which method should they use?

console.log("Debugging message");

document.write("Debugging message");

A company wants to generate a new paragraph on a webpage dynamically using JavaScript. Which of the following will achieve this?

document.write("<p>New paragraph</p>");

console.log("<p>New paragraph</p>");

prompt("<p>New paragraph</p>");

A developer uses document.write("Hello, world!"); inside their script, but it removes all previous content from the page. What is the best practice to avoid this issue?

Use document.getElementById("demo").innerHTML = "Hello, world!";

Only use document.write() after window.onload

Use alert("Hello, world!"); instead

Use console.log("Hello, world!");

A developer wants to write a JavaScript statement that displays "Hello, World!" in the console. Which statement is correct?

console.print("Hello, World!");

print.console("Hello, World!");

A developer writes the following code but it doesn’t work properly: let x = 5 let y = 10 let sum = x + y console.log(sum) What is the issue in this code?

Missing semicolons after each statement

console.log(sum) should be alert(sum)

The variables should be declared using var instead of let

The + operator cannot be used for numbers in JavaScript

In JavaScript, what is the purpose of a semicolon (;) at the end of a statement?

It separates different JavaScript statements

It is required to run JavaScript code

It allows JavaScript to execute code faster

It defines the scope of a variable

A web developer wants to execute multiple JavaScript statements in sequence. Which of the following examples is correct?

let a = 10; let b = 20; let c = a + b; console.log(c);

let a = 10 let b = 20 let c = a + b console.log(c)

let a = 10; let b = 20 let c = a + b; console.log(c)

let a = 10 let b = 20; let c = a + b console.log(c);

A developer wants to explain the purpose of a function without affecting the functionality of the code. What is the best way to do this?

Write a comment inside the function using //

Write a comment outside the function using /* */

Write a comment at the end of the function using //

A company’s development team wants to improve code readability. Which of the following is a good practice for using comments?

Using comments to describe the overall logic of complex code

Writing comments for every single line of code

Writing comments in a different programming language

A developer accidentally leaves a multi-line comment unfinished. What will happen? /* This is a multi-line comment console.log("Hello, world!");

A syntax error will occur, preventing the code from running

Only the comment will be ignored, and the rest will execute

The comment will automatically close at the end of the file

A company is updating its JavaScript coding standards and wants to avoid unexpected variable behavior. Why is let preferred over var?

let is block-scoped, while var is function-scoped

let allows variables to be used before declaration

let is function-scoped, while var is block-scoped

let variables automatically become const

Test 1 - JavaScript

Authored by Chadnie Ampalaya

Computers

University

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50 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A web developer wants to add interactivity to a webpage, such as making a button display an alert when clicked. Which programming language should they use?

HTML

CSS

JavaScript

SQL

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A company wants to create a dynamic website where users can interact with elements without reloading the page. What feature of JavaScript allows this?

Static Content Rendering

Client-Side Scripting

Relational Database Management

Cascading Style Sheets

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An online store wants to display a pop-up message when a customer adds an item to their cart. Which JavaScript function can be used for this?

console.log("Item added!");

alert("Item added to cart!");

document.write("Item added!");

prompt("Item added to cart!");

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A developer wants to change the text of a paragraph when a user clicks a button. Which JavaScript method can they use?

document.getElementById("demo").innerHTML = "New text";

document.getElementById("demo").style.color = "red";

alert("New text");

console.log("New text");

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A business website wants to execute JavaScript code only when the webpage is fully loaded. Which event should be used?

onmouseover

onclick

onload

onkeydown

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A web developer wants to ensure that JavaScript is executed only after the HTML content is fully loaded. Where is the best place to place the <script> tag?

Inside the <head> section

At the beginning of the <body> section

At the end of the <body> section

Inside a <div> element

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A company wants to separate JavaScript code from their HTML file for better organization and reusability. What is the best approach?

Write JavaScript inside the <body> section

Use the <script> tag inside the <head> section

Place JavaScript in an external .js file and link it using <script src="script.js"></script>

Use inline JavaScript within HTML elements

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