JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 222 · 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 print? (Look at the quotes!)
   let x = "9";
   let y = 2;
   console.log(x + y); (a) 11 (b) Error (c) 92
2. 2.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) name (c) Well done, name! (d) Riya
3. 3.⚡ What number does this code print?
   let a = 25;
   let b = 30;
   console.log(a + b);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 3;
   console.log(x + y); (a) 4 (b) Error (c) 13
5. 5.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
6. 6.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 2;
   console.log(x + y); (a) 10 (b) Error (c) 82
8. 8.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a table (d) a new tab
9. 9.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) for
10. 10.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) if
11. 11.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) name (d) Hello, Kabir!
12. 12.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);
13. 13.⚡ What number does this code print?
    let score = 29;
    score = score + 18;
    score = score - 13;
    console.log(score);
14. 14.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) console.log() (d) if
16. 16.⚡ What number does this code print?
    let a = 14;
    let b = 16;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 18;
    runs = runs - 34;
    console.log(runs);
18. 18.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) name (c) Zoya (d) Welcome, name!
19. 19.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) name (d) Hi, Riya!
21. 21.⚡ What number does this code print?
    let a = 10;
    let b = 23;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let a = 26;
    let b = 14;
    console.log(a + b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 13 (b) Error (c) 76
24. 24.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) for (d) let
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) 2 (c) Error
26. 26.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) name (d) Hi, name!
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .js (d) .html
28. 28.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Arjun (d) Well done, name!
29. 29.⚡ What number does this code print?
    let a = 3;
    let b = 11;
    console.log(a * b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) Error (b) 93 (c) 12
31. 31.⚡ What number does this code print?
    let a = 8;
    let b = 12;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 6;
    apples = apples - 3;
    console.log(apples);
33. 33.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) Error (b) 58 (c) 13
35. 35.⚡ What number does this code print?
    let books = 28;
    books = books + 2;
    books = books - 25;
    console.log(books);
36. 36.⚡ What number does this code print?
    let a = 49;
    let b = 3;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let books = 21;
    books = books + 9;
    books = books - 4;
    console.log(books);
38. 38.⚡ What number does this code print?
    let books = 14;
    books = books + 13;
    books = books - 15;
    console.log(books);
39. 39.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, name! (d) Welcome, Aman!
40. 40.⚡ What number does this code print?
    let a = 45;
    let b = 14;
    console.log(a - b);

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