JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 695 · 40 questions

Code tip (Line by line): let x = 5; makes a variable x holding 5; x = x + 2; changes it to 7. console.log(…) writes in the console; alert(…) shows a pop-up box. Text in quotes + anything = joined text: "5" + 3 → "53".

1. 1.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
2. 2.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
3. 3.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) console.log() (d) if
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
5. 5.⚡ What number does this code print?
   let a = 27;
   let b = 15;
   console.log(a + b);
6. 6.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
7. 7.⚡ What does this code show?
   let name = "Aman";
   alert("Well done, " + name + "!"); (a) Well done, Aman! (b) Aman (c) name (d) Well done, name!
8. 8.⚡ What number does this code print?
   let a = 8;
   let b = 10;
   console.log(a * b);
9. 9.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Meera (c) Hello, name! (d) name
10. 10.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) if
11. 11.⚡ What number does this code print?
    let a = 9;
    let b = 19;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let score = 17;
    score = score + 2;
    score = score - 7;
    console.log(score);
13. 13.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) if (d) for
14. 14.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
15. 15.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 19;
    runs = runs - 12;
    console.log(runs);
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) alert() (d) console.log()
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 10 (b) 55 (c) Error
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 27 (c) 9
20. 20.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 11;
    coins = coins - 2;
    console.log(coins);
21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, Zoya! (d) Well done, name!
22. 22.⚡ What number does this code print?
    let a = 6;
    let b = 1;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let a = 60;
    let b = 17;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let a = 49;
    let b = 30;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 41;
    let b = 3;
    console.log(a + b);
26. 26.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) if (d) for
27. 27.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, Kabir! (d) Hi, name!
28. 28.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
29. 29.⚡ What number does this code print?
    let a = 47;
    let b = 1;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let books = 19;
    books = books + 20;
    books = books - 16;
    console.log(books);
31. 31.⚡ What number does this code print?
    let a = 6;
    let b = 11;
    console.log(a * b);
32. 32.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
33. 33.⚡ What number does this code print?
    let a = 34;
    let b = 26;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let a = 3;
    let b = 11;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let a = 27;
    let b = 18;
    console.log(a - b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 15 (c) 87
38. 38.⚡ What number does this code print?
    let a = 43;
    let b = 5;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Hello, name! (d) Meera
40. 40.⚡ What number does this code print?
    let a = 45;
    let b = 39;
    console.log(a - b);

Free html and css lessons, practice and worksheets at talentjr.in/html-css-for-kids