JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 646 · 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) alert() (b) console.log() (c) for (d) let
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 1;
   console.log(x + y); (a) Error (b) 51 (c) 6
3. 3.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) Kabir (b) Hi, Kabir! (c) name (d) Hi, name!
4. 4.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) if (d) for
5. 5.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) let (d) if
6. 6.⚡ What number does this code print?
   let a = 11;
   let b = 9;
   console.log(a * b);
7. 7.⚡ What number does this code print?
   let books = 6;
   books = books + 13;
   books = books - 14;
   console.log(books);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 9;
   console.log(x + y); (a) Error (b) 17 (c) 89
9. 9.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
10. 10.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) if
11. 11.⚡ 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
12. 12.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 3;
    marks = marks - 11;
    console.log(marks);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 94 (b) 13 (c) Error
14. 14.⚡ What number does this code print?
    let a = 52;
    let b = 34;
    console.log(a + b);
15. 15.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
16. 16.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 7;
    apples = apples - 2;
    console.log(apples);
17. 17.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, name! (d) Well done, Aman!
18. 18.⚡ What number does this code print?
    let books = 27;
    books = books + 7;
    books = books - 2;
    console.log(books);
19. 19.⚡ What number does this code print?
    let a = 50;
    let b = 12;
    console.log(a - b);
20. 20.⚡ What number does this code print?
    let a = 8;
    let b = 27;
    console.log(a + b);
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
22. 22.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 13;
    apples = apples - 3;
    console.log(apples);
23. 23.⚡ 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
24. 24.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) Error (b) 16 (c) 97
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 10 (b) 82 (c) Error
27. 27.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Arjun! (c) Arjun (d) Well done, name!
29. 29.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 5;
    apples = apples - 5;
    console.log(apples);
30. 30.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) alert() (d) let
31. 31.⚡ What number does this code print?
    let books = 13;
    books = books + 9;
    books = books - 6;
    console.log(books);
32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) name (d) Welcome, Meera!
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 83 (b) 11 (c) Error
34. 34.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) Hello, name! (c) Arjun (d) name
35. 35.⚡ 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
36. 36.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) Welcome, name! (d) name
37. 37.⚡ What number does this code print?
    let a = 31;
    let b = 23;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, name! (d) Well done, Riya!
39. 39.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) Hello, name! (d) name
40. 40.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);

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