JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 358 · 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 = 57;
   let b = 22;
   console.log(a - b);
2. 2.⚡ What number does this code print?
   let books = 30;
   books = books + 9;
   books = books - 17;
   console.log(books);
3. 3.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) Hello, name! (d) name
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) for (d) alert()
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
6. 6.⚡ What does this code show?
   let name = "Kabir";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, Kabir! (c) Kabir (d) Well done, name!
7. 7.⚡ What number does this code print?
   let score = 16;
   score = score + 8;
   score = score - 20;
   console.log(score);
8. 8.⚡ What number does this code print?
   let a = 20;
   let b = 7;
   console.log(a + b);
9. 9.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, name! (d) Hello, Zoya!
10. 10.⚡ Which JavaScript word repeats code? (a) if (b) let (c) console.log() (d) for
11. 11.⚡ What number does this code print?
    let a = 35;
    let b = 16;
    console.log(a - b);
12. 12.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
13. 13.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
14. 14.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 5;
    runs = runs - 1;
    console.log(runs);
15. 15.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
16. 16.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) for (d) if
17. 17.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) console.log()
18. 18.⚡ What number does this code print?
    let a = 9;
    let b = 12;
    console.log(a * b);
19. 19.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
20. 20.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, Riya! (d) Well done, name!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) 62 (c) Error
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 31 (b) Error (c) 4
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) Error (b) 6 (c) 33
24. 24.⚡ What number does this code print?
    let books = 21;
    books = books + 6;
    books = books - 7;
    console.log(books);
25. 25.⚡ What number does this code print?
    let a = 58;
    let b = 37;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) Error (b) 9 (c) 63
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 54 (b) Error (c) 9
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) 36 (c) Error
29. 29.⚡ What number does this code print?
    let score = 27;
    score = score + 5;
    score = score - 1;
    console.log(score);
30. 30.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) let
31. 31.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 5;
    marks = marks - 14;
    console.log(marks);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 2 (b) Error (c) 11
33. 33.⚡ What number does this code print?
    let a = 30;
    let b = 17;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let a = 49;
    let b = 2;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 17;
    runs = runs - 3;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let a = 31;
    let b = 9;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let score = 29;
    score = score + 15;
    score = score - 26;
    console.log(score);
38. 38.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, name! (d) Well done, Kabir!
39. 39.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 15;
    runs = runs - 36;
    console.log(runs);
40. 40.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);

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