JavaScript MCQs

JavaScript ES6+, closures, promises, event loop, DOM, and async/await.

23 MCQsProgrammingAll Levels

Key Concept Overview & Exam Context

Review core principles of JavaScript before answering questions. These questions simulate placement technical assessments (TCS, Infosys, Amazon), university exams (CS/IT), and technical certifications.

Target Readiness

Placements & Job Interviews

Question Format

Multiple-Choice with Explanations

Verified Solutions

Step-by-step Output Traces

JavaScript MCQ Questions

Page 2 of 2 (23 total)

What is the DOM in the context of web development?

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Correct Answer: A programming interface that represents an HTML document as a structured tree of objects that JavaScript can interact with

Explanation:

The Document Object Model gives JavaScript a way to read and modify the structure, content, and styling of a webpage after it has loaded, which is how dynamic interactions like updating text without reloading the page become possible.

What will typeof NaN return in JavaScript?

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What will typeof NaN return in JavaScript?

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Showing 21 to 23 of 23 questions