Which key is commonly used to open Developer Tools in most browsers?

• A) F10
• B) F12
• C) F5
• D) F1

HTML validation is performed by:

• A) Server only
• B) Browser automatically
• C) JavaScript only
• D) Database

Which of the following is a fast, small, and feature-rich JavaScript library?

• A) SQuery
• B) None of the given options
• C) FQuery
• D) jQuery

Which attribute triggers validation on form submit?

• A) onclick
• B) onsubmit
• C) onload
• D) onchange

What is responseXML used for?

• A) Rendering HTML only
• B) Handling CSS data
• C) Parsing XML response data
• D) Processing JSON only

What does setting async = true mean in an AJAX request?

• A) The server does not respond
• B) The browser stops execution until response is received
• C) The request is disabled
• D) The request runs in the background without blocking the page

What is the result of typeof NaN?

• A) string
• B) number
• C) undefined
• D) NaN

Which of the following method(s) is/are used for traversing up the DOM tree?

• A) parent()
• B) grandParents()
• C) parental()
• D) parents() and grandParents()

Loop performance improves when you:

• A) Move calculations outside the loop
• B) Use recursion
• C) Increase iterations
• D) Add extra variables

Why should we avoid eval()?

• A) All of the above
• B) It is unnecessary
• C) It has security risks
• D) It is slow

The break statement is commonly used in:

• A) Objects
• B) Functions
• C) Loops and switch statements
• D) Arrays

Client-side validation is performed by:

• A) Browser
• B) Firewall
• C) Database
• D) Server

To traverse sideways in the DOM Tree, ___________ is not a function.

• A) siblings()
• B) nextUntil()
• C) next()
• D) nexts()

What is the purpose of the debugger keyword in JavaScript?

• A) It makes the code run faster
• B) It compiles the code into HTML
• C) It removes all errors automatically
• D) It pauses code execution for debugging purposes

What is the primary use of the splice() method?

• A) Adds and/or removes elements from the array
• B) Only deletes elements from the array
• C) Sorts the elements of the array
• D) Only adds elements to the array

Which condition confirms that an AJAX request was successfully completed?

• A) readyState == 0 and status == 200
• B) readyState == 4 and status == 200
• C) readyState == 1 and status == 500
• D) readyState == 2 and status == 404

What happens if you use a variable before declaring it (with var)?

• A) The program stops immediately
• B) It may return undefined
• C) It gives a syntax error
• D) It always gives a runtime error

In AJAX, which event is used to check the status of a server response?

• A) onreadystatechange
• B) onsubmit
• C) onclick
• D) onload

Why should we avoid global variables?

• A) They run faster
• B) They can be changed from anywhere in the program
• C) They are always required
• D) They increase security

The JQuery code: $("p").hide() will hide _________.

• A) all <p> elements
• B) None of the given options
• C) only last <p> element
• D) only first <p> element