JavaScript MCQ Questions
JavaScript MCQ Questions are an excellent way to assess and improve your understanding of JavaScript programming. These multiple-choice questions cover essential topics like syntax, functions, DOM manipulation, events, and asynchronous programming. Whether you're a beginner or an experienced developer, these MCQs provide an effective way to test your knowledge and refine your JavaScript skills. Perfect for exam preparation, technical interviews, or just brushing up on JavaScript fundamentals, these questions will help you master core JavaScript concepts and enhance your problem-solving abilities.
Q1. What does JavaScript primarily add to web pages?
A. Structure
B. Style
C. Interactivity
D. Database support
📘 View Explanation
Q2. Which HTML tag is used to include JavaScript code?
A. <js>
B. <script>
C. <javascript>
D. <code>
📘 View Explanation
Q3. Which symbol is used for single-line comments in JavaScript?
A. //
B. <!-- -->
C. /* */
D. #
📘 View Explanation
Q4. Which data type is NOT supported in JavaScript?
A. Number
B. Boolean
C. Character
D. Object
📘 View Explanation
Q5. Which keyword is used to declare a variable in JavaScript?
A. var
B. let
C. const
D. All of the above
📘 View Explanation
Q6. What is the default value of an uninitialized variable in JavaScript?
A. 0
B. null
C. undefined
D. false
📘 View Explanation
Q7. Which operator is used to compare both value and type?
A. ==
B. =
C. ===
D. !=
📘 View Explanation
Q8. Which function is used to print output in the browser console?
A. print()
B. console.log()
C. log.print()
D. display()
📘 View Explanation
Q9. Which popup box displays a message and waits for user to click OK?
A. alert()
B. confirm()
C. prompt()
D. message()
📘 View Explanation
Q10. Which popup box allows user input?
A. alert()
B. confirm()
C. prompt()
D. input()
📘 View Explanation
Q11. Which keyword is used to define a function in JavaScript?
A. def
B. function
C. fun
D. method
📘 View Explanation
Q12. How do you call a function named myFunc in JavaScript?
A. call myFunc;
B. execute myFunc;
C. myFunc();
D. run(myFunc);
📘 View Explanation
Q13. Which symbol is used to separate multiple statements on one line?
A. ,
B. ;
C. :
D. .
📘 View Explanation
Q14. Which keyword is used to handle exceptions in JavaScript?
A. try-catch
B. error-handle
C. catch-error
D. throw-catch
📘 View Explanation
Q15. Which method converts JSON data to a JavaScript object?
A. JSON.convert()
B. JSON.parse()
C. JSON.stringify()
D. JSON.object()
📘 View Explanation
Q16. Which method converts a JavaScript object to JSON string?
A. JSON.toString()
B. JSON.parse()
C. JSON.stringify()
D. JSON.objectify()
📘 View Explanation
Q17. Which keyword is used to declare a constant in JavaScript?
A. var
B. let
C. const
D. define
📘 View Explanation
Q18. Which operator is used to concatenate strings in JavaScript?
A. +
B. &
C. .
D. *
📘 View Explanation
Q19. Which method removes the last element from an array?
A. remove()
B. delete()
C. pop()
D. shift()
📘 View Explanation
Q20. Which method adds an element to the end of an array?
A. insert()
B. append()
C. push()
D. add()
📘 View Explanation