JS Quiz (Easy Level) 0% 2 Report a question Table of Contents ToggleReport a questionLike this: What's wrong with this question? You cannot submit an empty report. Please add some details. Oops! Times Up! JavaScript (JS) JS Quiz for beginners (Level- Easy) Click on Start Button ! Login Form. NameEmail 1 / 30 Category: Easy Level 1. NaN stands for “Not a Number” and its data type is number. a. True b. False Although it means “Not a Number”, typeof NaN is number. 2 / 30 Category: Easy Level 2. Which method shows confirmation dialog? a. prompt() b. confirm() c. alert() d. message() 3 / 30 Category: Easy Level 3. Which operator negates condition? a. ~ b. != c. not d. ! 4 / 30 Category: Easy Level 4. Which JavaScript runs on browser? a. Database JS b. Client-side JS c. Backend JS d. Server-side JS 5 / 30 Category: Easy Level 5. Which keyword exits function? a. stop b. break c. exit d. return 6 / 30 Category: Easy Level 6. Which object provides math operations? a. Number b. Arithmetic c. Math d. Calc 7 / 30 Category: Easy Level 7. Which method sets a timer? a. timer() b. both a & b c. setInterval() d. setTimeout() 8 / 30 Category: Easy Level 8. let variables are function-scoped. a. False b. True let is block-scoped, not function-scoped. 9 / 30 Category: Easy Level 9. Which keyword throws error manually? a. catch b. throw c. stop d. error 10 / 30 Category: Easy Level 10. The const keyword allows reassignment of values. a. False b. True const variables cannot be reassigned. 11 / 30 Category: Easy Level 11. Which statement handles errors? a. throw-error b. try-catch c. exception d. error-handle 12 / 30 Category: Easy Level 12. Which function converts object to JSON? a. JSON.stringify() b. toJSON() c. JSON.parse() d. objectToJSON() 13 / 30 Category: Easy Level 13. Which value represents no value? a. null b. undefined c. none d. empty 14 / 30 Category: Easy Level 14. Which keyword checks multiple conditions? a. switch b. else c. if d. for 15 / 30 Category: Easy Level 15. Which function converts JSON to object? a. parseJSON() b. JSON.parse() c. convertJSON() d. JSON.stringify() 16 / 30 Category: Easy Level 16. Which symbol is used for arrow function? a. == b. => c. -> d. <= 17 / 30 Category: Easy Level 17. Which method takes user input? a. confirm() b. prompt() c. input() d. alert() 18 / 30 Category: Easy Level 18. JavaScript can run without a browser using environments like Node.js. a. False b. True 19 / 30 Category: Easy Level 19. Which method stops setInterval? a. clearInterval() b. stopInterval() c. endInterval() d. clearTimeout() 20 / 30 Category: Easy Level 20. JavaScript supports asynchronous programming. a. True b. False Using callbacks, promises, and async/await. 21 / 30 Category: Easy Level 21. Arrow functions have their own 'this' keyword. a. False b. True Arrow functions inherit this from the surrounding scope. 22 / 30 Category: Easy Level 22. Which method rounds a number? a. Math.floor() b. Math.ceil() c. all of these d. Math.round() 23 / 30 Category: Easy Level 23. Which operator is logical OR? a. && b. | c. || d. ! 24 / 30 Category: Easy Level 24. Which keyword defines a function? a. function b. def c. fun d. method 25 / 30 Category: Easy Level 25. isNaN("123") returns true. a. False b. True 26 / 30 Category: Easy Level 26. JavaScript is a case-sensitive language. a. True b. False myVar and myvar are treated as different identifiers. 27 / 30 Category: Easy Level 27. undefined means a variable has been declared but not assigned a value. a. False b. True 28 / 30 Category: Easy Level 28. JavaScript can be used to manipulate HTML elements dynamically. a. False b. True This is done using DOM manipulation. 29 / 30 Category: Easy Level 29. Which method selects elements using CSS selector? a. querySelector() b. selectElement() c. cssSelect() d. getSelector() 30 / 30 Category: Easy Level 30. Which operator is logical AND? a. || b. & c. && d. ! Your score is 0% Restart quiz Rate Us ! Thank You for Your Love ! Send feedback Like this:Like Loading...Share post Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Read more articles Previous Post30 JavaScript Questions Quiz Prajjwal Singh Tech Blogger || Web developer || Computer Networking Enthusiast || Microsoft SQL Database Management Expert || Software Debugger || Learned DOS OS Structure You Might Also Like 30 JavaScript Questions Quiz December 29, 2025 Leave a ReplyCancel reply
