JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 967 · 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 apples = 24;
   apples = apples + 13;
   apples = apples - 2;
   console.log(apples);
2. 2.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
3. 3.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) let
4. 4.⚡ What number does this code print?
   let marks = 14;
   marks = marks + 6;
   marks = marks - 20;
   console.log(marks);
5. 5.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) if
6. 6.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
7. 7.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, name! (d) Hello, Kabir!
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 4;
   console.log(x + y); (a) Error (b) 64 (c) 10
9. 9.⚡ What number does this code print?
   let score = 20;
   score = score + 17;
   score = score - 3;
   console.log(score);
10. 10.⚡ What number does this code print?
    let score = 13;
    score = score + 9;
    score = score - 4;
    console.log(score);
11. 11.⚡ What number does this code print?
    let a = 27;
    let b = 14;
    console.log(a - b);
12. 12.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) name (c) Hello, name! (d) Aman
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) Error (c) 8
14. 14.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 18;
    apples = apples - 28;
    console.log(apples);
15. 15.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 3;
    apples = apples - 21;
    console.log(apples);
16. 16.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let a = 2;
    let b = 8;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 22;
    let b = 20;
    console.log(a - b);
20. 20.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) console.log()
21. 21.⚡ What number does this code print?
    let score = 7;
    score = score + 15;
    score = score - 10;
    console.log(score);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) 32 (c) Error
23. 23.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) Hi, Zoya! (d) name
24. 24.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 14 (b) 68 (c) Error
26. 26.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 18;
    coins = coins - 7;
    console.log(coins);
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
28. 28.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 14;
    marks = marks - 16;
    console.log(marks);
29. 29.⚡ What number does this code print?
    let a = 54;
    let b = 36;
    console.log(a + b);
30. 30.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
31. 31.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
32. 32.⚡ What number does this code print?
    let a = 17;
    let b = 8;
    console.log(a + b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) Error (b) 6 (c) 42
34. 34.⚡ What number does this code print?
    let a = 28;
    let b = 22;
    console.log(a - b);
35. 35.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
36. 36.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 20;
    apples = apples - 13;
    console.log(apples);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) Error (b) 57 (c) 12
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) Well done, Riya! (d) name
39. 39.⚡ What number does this code print?
    let a = 8;
    let b = 6;
    console.log(a * b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 5 (c) 41

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