HTML, CSS & JavaScript – Lesson 2 Review KS3

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Question 1 of 10

1. Question
Why is using hardcoded values in JavaScript programs limiting?
- It makes the webpage run faster
- It prevents JavaScript functions from executing
- It removes the need for variables
- It does not allow users to input their own values for processing
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Question 2 of 10

2. Question
Which HTML element is used to allow users to enter data into a webpage?
- <button>
- <script>
- <input>
- <form>
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Question 3 of 10

3. Question
How can JavaScript access values entered into an <input> field?
- By using alert(input.value);
- By changing the text inside an <h1> tag
- By setting a variable to input.innerHTML;
- By using document.getElementById("id").value;
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Question 4 of 10

4. Question
What is the purpose of a JavaScript function in an interactive form?
- To execute JavaScript code when an event (such as a button click) occurs
- To style the webpage elements
- To change the structure of the webpage
- To stop users from entering data
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Question 5 of 10

5. Question
Which HTML element is commonly used to trigger JavaScript functions?
- A <button> with an onclick event
- A <div> with an ID selector
- A <link> element in the <head> section
- A <span> inside a paragraph
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Question 6 of 10

6. Question
If an input box has id=”username”, how can we store its value in a JavaScript variable?
- var user = document.input("username");
- var user = getElement("username").text;
- var user = document.getElementById("username").value;
- var user = document.alert("username").value;
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Question 7 of 10

7. Question
In the lesson examples, how did JavaScript output a message that includes user input?
- By using console.log("message")
- By using an alert() function with string concatenation
- By setting innerHTML = "message"
- By adding the text directly inside an <h1> tag
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Question 8 of 10

8. Question
What happens if a user does not enter a value in an input box before clicking a button?
- The webpage crashes
- The JavaScript function still runs, but the variable may be empty or undefined
- The browser automatically fills in a default value
- The function will not execute
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Question 9 of 10

9. Question
How can JavaScript perform mathematical operations on user input?
- By using alert("5 + 5");
- By changing the <input> field type to text
- By retrieving the input value, converting it to a number, and applying an operation
- By setting a CSS style on the input box
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Question 10 of 10

10. Question
What will happen if the following JavaScript function is run?
```
var number1 = document.getElementById("num").value;
alert(number1 * number1);
```
- It will display the square of the number entered by the user
- It will always display the number 1
- It will reset the input field
- It will prevent the user from clicking the button
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HTML, CSS and JavaScript

HTML, CSS & JavaScript – Lesson 2 Review KS3

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