JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 404 · 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.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) for (d) alert()
2. 2.⚡ What number does this code print?
   let a = 38;
   let b = 31;
   console.log(a - b);
3. 3.⚡ What number does this code print?
   let runs = 9;
   runs = runs + 16;
   runs = runs - 3;
   console.log(runs);
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
5. 5.⚡ What number does this code print?
   let marks = 5;
   marks = marks + 17;
   marks = marks - 14;
   console.log(marks);
6. 6.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
7. 7.⚡ What number does this code print?
   let a = 55;
   let b = 21;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let a = 11;
   let b = 11;
   console.log(a * b);
9. 9.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Kabir! (c) Kabir (d) name
10. 10.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
11. 11.⚡ What number does this code print?
    let a = 17;
    let b = 30;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let a = 18;
    let b = 14;
    console.log(a - b);
13. 13.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 12;
    apples = apples - 7;
    console.log(apples);
14. 14.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
15. 15.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 5;
    coins = coins - 7;
    console.log(coins);
16. 16.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put
17. 17.⚡ What number does this code print?
    let a = 5;
    let b = 9;
    console.log(a * b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) 3 (c) Error
19. 19.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) for
20. 20.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) Hello, Kabir! (d) name
21. 21.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) 77 (c) Error
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) 31 (c) Error
24. 24.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) for
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) Error (c) 32
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 10 (b) 37 (c) Error
27. 27.⚡ What number does this code print?
    let a = 38;
    let b = 18;
    console.log(a - b);
28. 28.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) for (d) console.log()
29. 29.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 7;
    apples = apples - 7;
    console.log(apples);
30. 30.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 7;
    coins = coins - 8;
    console.log(coins);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 97 (b) Error (c) 16
32. 32.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 18;
    coins = coins - 5;
    console.log(coins);
33. 33.⚡ What number does this code print?
    let score = 12;
    score = score + 10;
    score = score - 4;
    console.log(score);
34. 34.⚡ What number does this code print?
    let score = 8;
    score = score + 20;
    score = score - 3;
    console.log(score);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 66 (b) Error (c) 12
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Kabir (c) Welcome, Kabir! (d) Welcome, name!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 24 (b) Error (c) 6
38. 38.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 14;
    apples = apples - 4;
    console.log(apples);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) Error (b) 11 (c) 74

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