JavaScript and HTML Quiz

How can you change the source of an image in JavaScript?

• document.getElementById("image1").innerHTML = "newImage.jpg";

• document.getElementById("image1").src = "newImage.jpg";

• document.getElementById("image1").textContent = "newImage.jpg";

• document.getElementById("image1").setAttribute("alt", "newImage.jpg");

Which JavaScript property would you use to change the font color of a paragraph?

• document.getElementById("p1").style. Font = "red";

• document.getElementById("p1").style. color = "red";

• document.getElementById("p1").fontColor = "red";

• document.getElementById("p1").setTextColor("red");

What does the following JavaScript code do?

document.getElementById("p1").style.fontSize = "x-large";

• Changes the font size of the paragraph with ID "p1" to extra-large.

• Makes the text bold.

• Changes the font to Arial.

• Centers the text in the paragraph.

Which of the following is a valid variable declaration in JavaScript?

• var 1name = "John";

• var first-name = "John";

• var firstName = "John";

• var first name = "John";

What will the following JavaScript code output?

var age = "20"; var newAge = Number(age); alert(newAge);

• "20"

• NaN

• 20

• undefined

What is the correct way to convert a boolean value to a number in JavaScript?

• var num = Boolean(1);

• var num = String(true);

• var num = Number(true);

• var num = Convert.toBoolean(1);

Which of the following is NOT a valid data type in JavaScript?

• String

• Boolean

• Character

• Number

What does this code do?

var name = "Alice";

alert(name);

• Displays "Alice" in an alert box.

• Prints "Alice" on the webpage.

• Changes the page title to "Alice".

• Logs "Alice" to the console.

What is the output of the following JavaScript code?

var num1 = "5";

var num2 = 3;

var result = num1 + num2;

alert(result);

• 8

• 53

• 5 + 3

• Error

How can you change the background color of an element using JavaScript?

• A) document.getElementById("div1").style.bgColor = "blue";

• B) document.getElementById("div1").backgroundColor = "blue";

• C) document.getElementById("div1").style.backgroundColor = "blue";

• D) document.getElementById("div1").setBgColor("blue");