JavaScript Certification Test 2025
Questions and Answers
Which of the following escape sequences will print the backslash character? -
ANSWER✔✔-\\
Which of the following characters matches the start of a line in a regular expression -
ANSWER✔✔-^
What is the main role of JavaScript in an AJAX transaction? - ANSWER✔✔-To request
XML or plain text data from a web server
Which property is used to add CSS styles to elements in a Web Page? - ANSWER✔✔-
HTMLElement.style
What is a bug in the JavaScript code? - ANSWER✔✔-An error in the code
Which of the following is not a valid property? - ANSWER✔✔-coords.timestamp
What readyState value specifies that the response header has been received, but the
message body is yet to be received? - ANSWER✔✔-3
, Which of the following casting rules is incorrect when concatenating? (true is a Boolean
value) - ANSWER✔✔-9 + true equals "9true"
Which of the following statements is true of semicolons in JavaScript? - ANSWER✔✔-
Semicolons are essential while combining separate statements in a line
Which statement is false in reference of XSS attacks? - ANSWER✔✔-They cannot be
performed through emails or mail clients
Sarah has created a JavaScript library, and now she wants to include it in her document.
Which of the following statements follows the correct syntax to link the library in her
document? - ANSWER✔✔-<script type="text/javascript" src="library.js"></script>
Which of the following information is not a part of the cookie header? - ANSWER✔✔-
expires = date
Which of the following is not true of JavaScript plug-in? - ANSWER✔✔-Plug-ins cannot
be used without the library they depend upon; Every pre-made script is a library
How can a cookie be deleted using JavaScript? - ANSWER✔✔-By setting a passed
expiration date
Which event is triggered on the <select> element when the selection is modified? -
ANSWER✔✔-onchange
Questions and Answers
Which of the following escape sequences will print the backslash character? -
ANSWER✔✔-\\
Which of the following characters matches the start of a line in a regular expression -
ANSWER✔✔-^
What is the main role of JavaScript in an AJAX transaction? - ANSWER✔✔-To request
XML or plain text data from a web server
Which property is used to add CSS styles to elements in a Web Page? - ANSWER✔✔-
HTMLElement.style
What is a bug in the JavaScript code? - ANSWER✔✔-An error in the code
Which of the following is not a valid property? - ANSWER✔✔-coords.timestamp
What readyState value specifies that the response header has been received, but the
message body is yet to be received? - ANSWER✔✔-3
, Which of the following casting rules is incorrect when concatenating? (true is a Boolean
value) - ANSWER✔✔-9 + true equals "9true"
Which of the following statements is true of semicolons in JavaScript? - ANSWER✔✔-
Semicolons are essential while combining separate statements in a line
Which statement is false in reference of XSS attacks? - ANSWER✔✔-They cannot be
performed through emails or mail clients
Sarah has created a JavaScript library, and now she wants to include it in her document.
Which of the following statements follows the correct syntax to link the library in her
document? - ANSWER✔✔-<script type="text/javascript" src="library.js"></script>
Which of the following information is not a part of the cookie header? - ANSWER✔✔-
expires = date
Which of the following is not true of JavaScript plug-in? - ANSWER✔✔-Plug-ins cannot
be used without the library they depend upon; Every pre-made script is a library
How can a cookie be deleted using JavaScript? - ANSWER✔✔-By setting a passed
expiration date
Which event is triggered on the <select> element when the selection is modified? -
ANSWER✔✔-onchange
