JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 310 · 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.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) for
2. 2.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Riya! (d) Riya
3. 3.⚡ What number does this code print?
   let books = 24;
   books = books + 20;
   books = books - 32;
   console.log(books);
4. 4.⚡ What number does this code print?
   let a = 31;
   let b = 14;
   console.log(a + b);
5. 5.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) for (d) let
6. 6.⚡ What number does this code print?
   let a = 31;
   let b = 7;
   console.log(a - b);
7. 7.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Meera (d) Hi, name!
8. 8.⚡ What number does this code print?
   let books = 17;
   books = books + 16;
   books = books - 17;
   console.log(books);
9. 9.⚡ What number does this code print?
   let books = 11;
   books = books + 20;
   books = books - 2;
   console.log(books);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 71 (b) 8 (c) Error
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
12. 12.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
13. 13.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
14. 14.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 8;
    marks = marks - 5;
    console.log(marks);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) Error (c) 41
16. 16.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, Riya! (b) Hi, name! (c) Riya (d) name
17. 17.⚡ What number does this code print?
    let a = 28;
    let b = 26;
    console.log(a + b);
18. 18.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
19. 19.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) Error (c) 35
21. 21.⚡ What number does this code print?
    let a = 3;
    let b = 8;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 15;
    let b = 24;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 15;
    let b = 5;
    console.log(a - b);
24. 24.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) for
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 76 (b) 13 (c) Error
26. 26.⚡ What number does this code print?
    let a = 39;
    let b = 22;
    console.log(a - b);
27. 27.⚡ Which JavaScript word repeats code? (a) if (b) let (c) console.log() (d) for
28. 28.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
29. 29.⚡ What number does this code print?
    let a = 11;
    let b = 31;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 4;
    apples = apples - 1;
    console.log(apples);
31. 31.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 2;
    marks = marks - 11;
    console.log(marks);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 11 (b) Error (c) 65
33. 33.⚡ What number does this code print?
    let a = 57;
    let b = 5;
    console.log(a + b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 57 (b) Error (c) 12
35. 35.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
36. 36.⚡ What number does this code print?
    let a = 6;
    let b = 10;
    console.log(a * b);
37. 37.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, Arjun! (d) Well done, name!
38. 38.⚡ What number does this code print?
    let a = 8;
    let b = 33;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 41;
    let b = 30;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, name! (d) Hello, Riya!

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