# jQuery Question and Answer Interview & Exam Preparation

Published: 2026-02-17 · By Next-G Classes · Source: https://nextgclasses.com/blog/jquery-question-and-answer-interview-exam-preparation

> Prepare for interviews and exams with top jQuery questions and answers. Join the best Nextg Classes in Rohini Delhi for professional training in HTML, CSS, JavaScript, and jQuery with practical projects and placement support.

<h3>1. What is jQuery?</h3>
<p><span>Answer:</span><br />jQuery is a fast, lightweight, and feature-rich JavaScript library. It simplifies HTML document traversal, event handling, animation, and AJAX interactions for rapid web development.</p>
<h3>2. Why do we use jQuery?</h3>
<p><span>Answer:</span><br />We use jQuery to:</p>
<ul>
<li>
<p>Simplify JavaScript coding</p>
</li>
<li>
<p>Handle events easily</p>
</li>
<li>
<p>Perform animations</p>
</li>
<li>
<p>Make AJAX requests</p>
</li>
<li>
<p>Manipulate DOM elements</p>
</li>
<li>
<p>Ensure cross-browser compatibility</p>
</li>
</ul>
<h3>3. What is the difference between JavaScript and jQuery?</h3>
<p><span>Answer:</span></p>
<ul>
<li>
<p>JavaScript is a programming language.</p>
</li>
<li>
<p>jQuery is a library built using JavaScript.</p>
</li>
<li>
<p>jQuery makes JavaScript tasks easier and shorter.</p>
</li>
</ul>
<p>Example:<br />JavaScript:</p>
<div class="contain-inline-size rounded-2xl corner-superellipse/1.1 relative bg-token-sidebar-surface-primary">
<div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-javascript">document.getElementById("demo").innerHTML&nbsp;=&nbsp;"Hello";</code></div>
</div>
<p>jQuery:</p>
<div class="contain-inline-size rounded-2xl corner-superellipse/1.1 relative bg-token-sidebar-surface-primary">
<div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-javascript">$("#demo").html("Hello");<br /><br /></code></div>
</div>
<h3>4. How to include jQuery in a website?</h3>
<p><span>Answer:</span><br />You can include jQuery using a CDN link:</p>
<div class="contain-inline-size rounded-2xl corner-superellipse/1.1 relative bg-token-sidebar-surface-primary">
<div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-html">&lt;script&nbsp;src="https://code.jquery.com/jquery-3.6.0.min.js"&gt;&lt;/script&gt;<br /></code></div>
<div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-html">&nbsp;</code></div>
</div>
<h3>5. What is $(document).ready() function?</h3>
<p><span>Answer:</span><br />It ensures that the code runs only after the HTML document is fully loaded.</p>
<div class="contain-inline-size rounded-2xl corner-superellipse/1.1 relative bg-token-sidebar-surface-primary">
<div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-javascript">$(document).ready(function(){&nbsp;alert("Page Loaded"); });<br /><br /></code></div>
</div>
<h3>6. What are jQuery Selectors?</h3>
<p><span>Answer:</span><br />Selectors are used to select HTML elements.</p>
<p>Examples:</p>
<ul>
<li>
<p><code>$("#id")</code>&nbsp;&rarr; Select by ID</p>
</li>
<li>
<p><code>$(".class")</code>&nbsp;&rarr; Select by class</p>
</li>
<li>
<p><code>$("p")</code>&nbsp;&rarr; Select all paragraphs</p>
</li>
</ul>
<h3>7. What is the use of .hide() and .show()?</h3>
<p><span>Answer:</span><br />These methods hide and show elements.</p>
<div class="contain-inline-size rounded-2xl corner-superellipse/1.1 relative bg-token-sidebar-surface-primary">
<div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-javascript">$("#demo").hide(); $("#demo").show();<br /><br /></code></div>
</div>
<h3>8. What is jQuery AJAX?</h3>
<p><span>Answer:</span><br />AJAX allows loading data from the server without refreshing the page.</p>
<div class="contain-inline-size rounded-2xl corner-superellipse/1.1 relative bg-token-sidebar-surface-primary">
<div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-javascript">$.ajax({&nbsp;url:&nbsp;"data.html",&nbsp;success:&nbsp;function(result){ $("#demo").html(result); } });<br /><br /></code></div>
</div>
<h3>9. What is the difference between .html() and .text()?</h3>
<p><span>Answer:</span></p>
<ul>
<li>
<p><code>.html()</code>&nbsp;sets or returns HTML content.</p>
</li>
<li>
<p><code>.text()</code>&nbsp;sets or returns only text content.</p>
</li>
</ul>
<br />
<h3>10. What is chaining in jQuery?</h3>
<p><span>Answer:</span><br />Chaining allows multiple jQuery methods on the same element.</p>
<div class="contain-inline-size rounded-2xl corner-superellipse/1.1 relative bg-token-sidebar-surface-primary">
<div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-javascript">$("#demo").css("color","red").slideUp(2000).slideDown(2000);<br /><br /></code></div>
</div>
<h3>11. What are jQuery Events?</h3>
<p><span>Answer:</span><br />Events are actions like:</p>
<ul>
<li>
<p>click()</p>
</li>
<li>
<p>dblclick()</p>
</li>
<li>
<p>mouseenter()</p>
</li>
<li>
<p>mouseleave()</p>
</li>
<li>
<p>keypress()</p>
</li>
</ul>
<p>Example:</p>
<div class="contain-inline-size rounded-2xl corner-superellipse/1.1 relative bg-token-sidebar-surface-primary">
<div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-javascript">$("#btn").click(function(){&nbsp;alert("Button Clicked"); });<br /><br /></code></div>
</div>
<h3>12. What is the use of addClass() and removeClass()?</h3>
<p><span>Answer:</span></p>
<ul>
<li>
<p><code>addClass()</code>&nbsp;adds CSS class</p>
</li>
<li>
<p><code>removeClass()</code>&nbsp;removes CSS class</p>
</li>
</ul>
<div class="contain-inline-size rounded-2xl corner-superellipse/1.1 relative bg-token-sidebar-surface-primary">
<div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-javascript">$("#demo").addClass("active"); $("#demo").removeClass("active");<br /><br /></code></div>
</div>
<h3>13. What is the latest version of jQuery?</h3>
<p><span>Answer:</span><br />The latest stable version (as of recent updates) is jQuery 3.x series.</p>
<h3>14. What is the difference between == and === in jQuery/JavaScript?</h3>
<p><span>Answer:</span></p>
<ul>
<li>
<p><code>==</code>&nbsp;compares value only</p>
</li>
<li>
<p><code>===</code>&nbsp;compares value and data type</p>
</li>
</ul>
<h3>15. Is jQuery still used today?</h3>
<p><span>Answer:</span><br />Yes, jQuery is still used in many websites, especially legacy projects. However, modern frameworks like React, Angular, and Vue are more popular for large applications.</p>