What will happen when this code runs? HTML <html> <body> <script> let userName = prompt("Enter your name:"); alert("Your name is: " + userName); </script> </body> </html>

A pop-up displays "Your name is: [user's input]"

The name is printed in the browser console

The webpage content is updated with "Your name is: [user's input]"

What will happen when this code is executed? JavaScript function greet(name) { return "Hello, " + name; } console.log(greet("Alisha"));

"Hello, Alisha" will be logged in the console

The function will greet the name "Alisha"

The code will result in an error

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Introduction To JavaScript

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Question 1

Which of the following correctly declares a constant variable PI with the value 3.14 in JavaScript?

var PI = 3.14;
let PI = 3.14;
const PI = 3.14;
PI = 3.14;

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Question 2

What exactly does "Execution Context" mean in JavaScript?

Code block for function declarations
Environment for executing JavaScript code
Global object in the browser
Special runtime variable

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Question 3

What happens when variable shadowing occurs in JavaScript?

A local variable hides a global variable with the same name
A function is unable to access global variables
Variables are reset to default values
JavaScript automatically changes the value of the variable.

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Question 4

What will be the output of the following JavaScript code snippet?

let y = 30;

if (true) {

let y = 40;

console.log(y);

}

console.log(y);

30 40
40 30
40 40
SyntaxError

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Question 5

What will be the output of this JavaScript code?

JavaScript

let a = 5;
function test() {
  let a = 10;
  console.log(a);
}
test();
console.log(a);

5 and 10
10 and 10
5 and 5
10 and 5

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Question 6

What will happen when this code runs?

HTML

<html>
  <body>
    <script>
      let userName = prompt("Enter your name:");
      alert("Your name is: " + userName);
    </script>
  </body>
</html>

A pop-up displays "Your name is: [user's input]"
The name is printed in the browser console
The webpage content is updated with "Your name is: [user's input]"
No output

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Question 7

Which of the following is true about the let keyword?

It is function-scoped
It is block-scoped and cannot be redeclared in the same scope
It can be redeclared within the same scope
It is hoisted to the top like var

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Question 8

What will happen when this code is executed?

JavaScript

function greet(name) {
    return "Hello, " + name;
}
console.log(greet("Alisha"));

The function will greet the name "Alisha"
The code will result in an error
"Hello, Alisha" will be logged in the console
Nothing will be logged

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Question 9

Consider the const declaration for an array:

const arr = [10, 20, 30];

arr[1] = 25;

console.log(arr);

What will be the output of the console.log(arr) statement?

[10, 20, 30]
[10, 25, 30]
TypeError: Assignment to constant variable.
[1, 2, 3]

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Question 10

JavaScript is a single-threaded language. What does that mean?

It can execute multiple tasks at once
It can only execute one task at a time
It doesn’t need any external libraries
It runs in multiple browsers simultaneously.

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JavaScript

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