Q1. What is JavaScript mainly used for on a web page?

A. Making the page interactive — responding to clicks, changing content and checking forms B. Styling the page with colours and fonts C. Storing the page on the server D. Drawing the page layout

Q2. Where is the best place to put a <script> tag in an HTML page?

A. Just before the closing </body> tag B. Inside the <title> tag C. Before the <!DOCTYPE html> line D. Inside an HTML comment

Q3. Which line writes "Hello" inside the element with id="demo"?

A. document.getElementById("demo").innerHTML = "Hello"; B. document.getElementById("demo").style = "Hello"; C. getElement("demo").write("Hello"); D. demo.innerHTML("Hello");

Q4. Which keyword declares a variable that you cannot reassign later?

A. const B. let C. var D. static

Q5. What is the value of "10" + 5 in JavaScript?

A. "105" B. 15 C. 105 D. NaN

Q6. Which operator checks BOTH the value and the type?

A. === B. == C. = D. !=

Q7. What is the index of the first item in an array?

A. 0 B. 1 C. -1 D. "first"

Q8. Which array method makes a NEW array by changing every item?

A. map() B. filter() C. forEach() D. find()

Q9. What does JSON stand for?

A. JavaScript Object Notation B. Java Standard Object Network C. JavaScript Online Notation D. Just Simple Object Names

Q10. Which is a correct arrow function?

A. const add = (a, b) => a + b; B. function add(a, b) => a + b; C. const add = (a, b) -> a + b; D. arrow add(a, b) { return a + b; }

Q11. What is a class in JavaScript?

A. A recipe (blueprint) for making objects B. A CSS style for a page C. A kind of loop D. A built-in HTML tag

Q12. What does a Promise represent?

A. A value that will arrive later B. A promise written in a comment C. A loop that never ends D. A variable that cannot change

Q13. Which method finds an element by its id?

A. getElementById() B. getElementByClass() C. querySelectorAll() D. findElement()

Q14. What does typeof [] return?

A. "object" B. "array" C. "list" D. "undefined"

Q15. Which loop runs its body at least once, even if the condition is false at the start?

A. do...while B. while C. for D. for...of

Q16. What does a try...catch block do?

A. Runs risky code and catches the error if it fails B. Makes code run faster C. Repeats code until it works D. Hides all errors forever

Q17. What does new Date(2026, 9, 28).getMonth() return?

A. 9 B. 10 C. 28 D. "October"

Q18. Which of these turns the string "42" into the number 42?

A. Number("42") B. String(42) C. "42".length D. "42".toUpperCase()

Q19. What is the DOM?

A. The page as a tree of objects the script can read and change B. A database of users C. A CSS file D. The browser history

Q20. When should you check a form's input?

A. Before it is sent — at the door, not after the guest is inside B. After the page reloads C. Only on the server, never in the browser D. Never — the browser does it