JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 536 · 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 does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) Kabir (d) name
2. 2.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) if (d) console.log()
3. 3.⚡ What number does this code print?
   let a = 53;
   let b = 3;
   console.log(a - b);
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) alert() (b) console.log() (c) for (d) let
6. 6.⚡ What number does this code print?
   let a = 46;
   let b = 14;
   console.log(a - b);
7. 7.⚡ What number does this code print?
   let a = 52;
   let b = 22;
   console.log(a - b);
8. 8.⚡ What number does this code print?
   let apples = 25;
   apples = apples + 7;
   apples = apples - 8;
   console.log(apples);
9. 9.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, name! (d) Well done, Zoya!
10. 10.⚡ What number does this code print?
    let a = 40;
    let b = 28;
    console.log(a - b);
11. 11.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) Error (c) 28
13. 13.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
14. 14.⚡ What number does this code print?
    let a = 25;
    let b = 16;
    console.log(a - b);
15. 15.⚡ What number does this code print?
    let a = 13;
    let b = 30;
    console.log(a + b);
16. 16.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
17. 17.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) console.log() (d) let
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) Error (c) 46
19. 19.⚡ What number does this code print?
    let a = 36;
    let b = 30;
    console.log(a + b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) Error (b) 69 (c) 15
21. 21.⚡ 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
22. 22.⚡ What number does this code print?
    let a = 33;
    let b = 21;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 7;
    marks = marks - 13;
    console.log(marks);
24. 24.⚡ 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
25. 25.⚡ What number does this code print?
    let a = 20;
    let b = 35;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 11;
    apples = apples - 3;
    console.log(apples);
27. 27.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) if
28. 28.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, name! (d) Well done, Arjun!
29. 29.⚡ What number does this code print?
    let a = 26;
    let b = 30;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 43;
    let b = 12;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
32. 32.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) name (d) Welcome, Zoya!
33. 33.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
34. 34.⚡ What number does this code print?
    let a = 11;
    let b = 8;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 8;
    coins = coins - 13;
    console.log(coins);
36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Meera! (d) Meera
37. 37.⚡ What number does this code print?
    let a = 43;
    let b = 18;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 18 (b) 99 (c) Error
40. 40.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Zoya! (c) name (d) Zoya

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