JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 479 · 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 = 11;
   let b = 9;
   console.log(a * b);
2. 2.⚡ What number does this code print?
   let a = 4;
   let b = 11;
   console.log(a * b);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 5;
   console.log(x + y); (a) 9 (b) 45 (c) Error
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
5. 5.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) let (d) alert()
6. 6.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
7. 7.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) alert()
8. 8.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, name! (d) Hi, Meera!
9. 9.⚡ What number does this code print?
   let a = 40;
   let b = 32;
   console.log(a - b);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) console.log() (d) let
11. 11.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) console.log() (d) let
12. 12.⚡ What number does this code print?
    let a = 30;
    let b = 19;
    console.log(a + b);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) Error (b) 55 (c) 10
14. 14.⚡ What number does this code print?
    let a = 27;
    let b = 23;
    console.log(a - b);
15. 15.⚡ What number does this code print?
    let a = 58;
    let b = 4;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let a = 60;
    let b = 16;
    console.log(a + b);
17. 17.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) for (d) console.log()
18. 18.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) name (d) Welcome, name!
19. 19.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, name! (d) Hello, Kabir!
20. 20.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 7;
    runs = runs - 28;
    console.log(runs);
21. 21.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a * b);
23. 23.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a new tab (d) a picture
24. 24.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
25. 25.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 17;
    runs = runs - 36;
    console.log(runs);
26. 26.⚡ What number does this code print?
    let a = 11;
    let b = 16;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 7;
    let b = 7;
    console.log(a * b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) Error (b) 77 (c) 14
29. 29.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
30. 30.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Riya (d) Hello, name!
31. 31.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 16;
    marks = marks - 7;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let a = 8;
    let b = 12;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 14;
    coins = coins - 33;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let a = 41;
    let b = 24;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let score = 15;
    score = score + 16;
    score = score - 27;
    console.log(score);
36. 36.⚡ What number does this code print?
    let score = 20;
    score = score + 3;
    score = score - 8;
    console.log(score);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 97 (b) 16 (c) Error
38. 38.⚡ What number does this code print?
    let a = 11;
    let b = 29;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 60;
    let b = 36;
    console.log(a + b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) Error (b) 13 (c) 76

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