JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 737 · 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.⚡ What number does this code print?
   let a = 24;
   let b = 34;
   console.log(a + b);
2. 2.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) console.log() (d) for
3. 3.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) let (d) console.log()
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .js (d) .html
5. 5.⚡ What number does this code print?
   let apples = 7;
   apples = apples + 16;
   apples = apples - 14;
   console.log(apples);
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 8;
   console.log(x + y); (a) Error (b) 14 (c) 68
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 9;
   console.log(x + y); (a) Error (b) 12 (c) 39
8. 8.⚡ What number does this code print?
   let a = 40;
   let b = 13;
   console.log(a - b);
9. 9.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) Error (c) 5
11. 11.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
12. 12.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Meera (c) name (d) Hello, name!
13. 13.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 5;
    runs = runs - 12;
    console.log(runs);
14. 14.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a + b);
15. 15.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
16. 16.⚡ What number does this code print?
    let books = 14;
    books = books + 5;
    books = books - 6;
    console.log(books);
17. 17.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 5;
    runs = runs - 17;
    console.log(runs);
18. 18.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 4;
    marks = marks - 6;
    console.log(marks);
19. 19.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a * b);
20. 20.⚡ Which JavaScript word repeats code? (a) for (b) let (c) if (d) console.log()
21. 21.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) Meera (c) name (d) Hello, name!
22. 22.⚡ What number does this code print?
    let a = 35;
    let b = 5;
    console.log(a - b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 43 (b) Error (c) 7
24. 24.⚡ What number does this code print?
    let score = 20;
    score = score + 9;
    score = score - 5;
    console.log(score);
25. 25.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) for (d) console.log()
26. 26.⚡ What number does this code print?
    let a = 44;
    let b = 1;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 25;
    let b = 1;
    console.log(a + b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) Error (b) 10 (c) 55
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 6 (b) 42 (c) Error
30. 30.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) 58 (c) Error
32. 32.⚡ What number does this code print?
    let a = 8;
    let b = 36;
    console.log(a + b);
33. 33.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) if (d) for
34. 34.⚡ What number does this code print?
    let a = 2;
    let b = 7;
    console.log(a * b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) Error (b) 15 (c) 78
36. 36.⚡ What number does this code print?
    let a = 2;
    let b = 8;
    console.log(a * b);
37. 37.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) name (c) Hi, Riya! (d) Hi, name!
38. 38.⚡ What number does this code print?
    let books = 8;
    books = books + 17;
    books = books - 1;
    console.log(books);
39. 39.⚡ What number does this code print?
    let a = 37;
    let b = 12;
    console.log(a + b);
40. 40.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) name (d) Hello, Kabir!

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