JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 717 · 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 = "Arjun";
   console.log("Well done, " + name + "!"); (a) Arjun (b) Well done, name! (c) name (d) Well done, Arjun!
2. 2.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) console.log()
4. 4.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) if
5. 5.⚡ What number does this code print?
   let marks = 16;
   marks = marks + 15;
   marks = marks - 10;
   console.log(marks);
6. 6.⚡ What number does this code print?
   let score = 25;
   score = score + 9;
   score = score - 1;
   console.log(score);
7. 7.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
8. 8.⚡ What number does this code print?
   let runs = 10;
   runs = runs + 10;
   runs = runs - 14;
   console.log(runs);
9. 9.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Kabir! (d) Kabir
10. 10.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
11. 11.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) console.log() (d) let
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) Error (b) 31 (c) 4
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 11 (b) 65 (c) Error
14. 14.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) name (d) Riya
15. 15.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
16. 16.⚡ What number does this code print?
    let a = 6;
    let b = 4;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let a = 5;
    let b = 21;
    console.log(a + b);
18. 18.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) Welcome, name! (d) name
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) Error (b) 10 (c) 64
20. 20.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, name! (d) Hello, Meera!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) Error (b) 46 (c) 10
22. 22.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 16;
    marks = marks - 13;
    console.log(marks);
23. 23.⚡ What number does this code print?
    let score = 8;
    score = score + 11;
    score = score - 17;
    console.log(score);
24. 24.⚡ What number does this code print?
    let a = 50;
    let b = 24;
    console.log(a - b);
25. 25.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
26. 26.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) alert()
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 14 (b) Error (c) 86
28. 28.⚡ What number does this code print?
    let a = 27;
    let b = 7;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let a = 52;
    let b = 21;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 8;
    let b = 16;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let a = 2;
    let b = 6;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
33. 33.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) name (d) Welcome, Aman!
34. 34.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 7;
    apples = apples - 9;
    console.log(apples);
35. 35.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) console.log() (d) let
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 8 (b) Error (c) 71
37. 37.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) Error (b) 12 (c) 75
39. 39.⚡ What number does this code print?
    let a = 56;
    let b = 28;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 36;
    let b = 16;
    console.log(a - b);

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