JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 416 · 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 score = 11;
   score = score + 9;
   score = score - 4;
   console.log(score);
2. 2.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) for (d) if
3. 3.⚡ What number does this code print?
   let a = 3;
   let b = 3;
   console.log(a * b);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 8;
   console.log(x + y); (a) 12 (b) Error (c) 48
5. 5.⚡ What number does this code print?
   let books = 20;
   books = books + 7;
   books = books - 13;
   console.log(books);
6. 6.⚡ What number does this code print?
   let apples = 14;
   apples = apples + 4;
   apples = apples - 11;
   console.log(apples);
7. 7.⚡ What number does this code print?
   let score = 8;
   score = score + 3;
   score = score - 6;
   console.log(score);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 9;
   console.log(x + y); (a) Error (b) 14 (c) 59
9. 9.⚡ What number does this code print?
   let a = 4;
   let b = 10;
   console.log(a * b);
10. 10.⚡ What number does this code print?
    let a = 6;
    let b = 6;
    console.log(a - b);
11. 11.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 8;
    apples = apples - 15;
    console.log(apples);
12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Riya (d) Hello, Riya!
13. 13.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) let (d) console.log()
14. 14.⚡ What number does this code print?
    let a = 12;
    let b = 10;
    console.log(a * b);
15. 15.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) let (d) if
16. 16.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
17. 17.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Meera (d) Welcome, Meera!
18. 18.⚡ What number does this code print?
    let a = 21;
    let b = 2;
    console.log(a + b);
19. 19.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) for (d) if
20. 20.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) let
21. 21.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 5;
    marks = marks - 17;
    console.log(marks);
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) name (c) Riya (d) Welcome, name!
23. 23.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) Hi, Meera! (d) name
24. 24.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, name! (d) Hello, Arjun!
25. 25.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
26. 26.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
27. 27.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 83 (b) Error (c) 11
29. 29.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 12;
    coins = coins - 12;
    console.log(coins);
30. 30.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
31. 31.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Welcome, name! (d) Meera
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 17 (b) Error (c) 98
34. 34.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 18;
    apples = apples - 17;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let a = 53;
    let b = 12;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 5;
    apples = apples - 7;
    console.log(apples);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) Error (b) 33 (c) 6
38. 38.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 9;
    marks = marks - 17;
    console.log(marks);
39. 39.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) Well done, name! (c) Aman (d) name
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 6 (c) 51

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