Which event is commonly used for handling form submissions?
'input'
'submit'
'click'
'change'
What is the purpose of the 'else if' statement in JavaScript?
To execute a block of code if the preceding 'if' condition is true.
To provide an alternative block of code to execute if the preceding 'if' or 'else if' conditions are false.
To declare a variable.
To define a loop that iterates a specific number of times.
What value is returned by confirm('Are you sure?') if the user clicks the 'Cancel' button?
confirm('Are you sure?')
null
undefined
false
true
What is the purpose of the return keyword in a function?
return
It assigns a value to a variable.
It specifies the data type of the function.
It sends a value back from the function to the caller.
It prints a value to the console.
What is the correct way to add an event listener that logs 'Button Clicked!' to the console when a button with the ID 'myButton' is clicked?
document.querySelector('#myButton').onclick = console.log('Button Clicked!');
document.getElementById('myButton').addEventListener('click', console.log('Button Clicked!'));
document.getElementById('myButton').addEventListener('click', function() { console.log('Button Clicked!'); });
document.querySelector('#myButton').addEventListener('click', () => console.log('Button Clicked!'));
What will the following code snippet log to the console?
console.log(5 + '5');
NaN
55
Error
10
What is the primary role of the browser's JavaScript engine?
Styling web page elements
Defining the structure of a web page
Interpreting and executing JavaScript code
Fetching data from a server
What does the querySelector() method return when it finds multiple matching elements in the DOM?
querySelector()
The last matching element
The first matching element
An array of all matching elements
Which loop in JavaScript is best suited for iterating through the properties of an object?
do-while
for...in
for
while
How can you change the text content of an HTML element using JavaScript?
All of the above
element.innerText = 'New text'
element.innerHTML = 'New text'
element.textContent = 'New text'