JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 902 · 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 coins = 23;
   coins = coins + 13;
   coins = coins - 6;
   console.log(coins);
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
3. 3.⚡ What number does this code print?
   let a = 26;
   let b = 20;
   console.log(a - b);
4. 4.⚡ What number does this code print?
   let a = 33;
   let b = 7;
   console.log(a + b);
5. 5.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) console.log() (d) for
6. 6.⚡ What number does this code print?
   let books = 11;
   books = books + 3;
   books = books - 9;
   console.log(books);
7. 7.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
8. 8.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
9. 9.⚡ What number does this code print?
   let marks = 11;
   marks = marks + 6;
   marks = marks - 16;
   console.log(marks);
10. 10.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Kabir! (d) Kabir
11. 11.⚡ What number does this code print?
    let a = 5;
    let b = 25;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 9;
    marks = marks - 31;
    console.log(marks);
13. 13.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) for (d) let
15. 15.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 20;
    marks = marks - 25;
    console.log(marks);
16. 16.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) Hi, Zoya! (d) name
17. 17.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, Meera! (b) Hi, name! (c) Meera (d) name
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) name (d) Aman
19. 19.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
20. 20.⚡ What number does this code print?
    let score = 9;
    score = score + 2;
    score = score - 1;
    console.log(score);
21. 21.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 10;
    coins = coins - 2;
    console.log(coins);
22. 22.⚡ What number does this code print?
    let books = 15;
    books = books + 9;
    books = books - 2;
    console.log(books);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) 16 (b) Error (c) 79
24. 24.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) let (d) for
25. 25.⚡ What number does this code print?
    let a = 50;
    let b = 5;
    console.log(a - b);
26. 26.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) Arjun (c) name (d) Well done, name!
27. 27.⚡ What number does this code print?
    let a = 20;
    let b = 20;
    console.log(a + b);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, name! (d) Welcome, Zoya!
29. 29.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, Kabir! (d) Hello, name!
30. 30.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) if (d) let
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 2 (c) 11
32. 32.⚡ What number does this code print?
    let books = 11;
    books = books + 5;
    books = books - 15;
    console.log(books);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) 5 (c) Error
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 13 (b) Error (c) 94
35. 35.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) alert() (d) if
36. 36.⚡ What number does this code print?
    let a = 22;
    let b = 10;
    console.log(a - b);
37. 37.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Zoya (d) Hello, Zoya!
38. 38.⚡ What number does this code print?
    let books = 22;
    books = books + 12;
    books = books - 30;
    console.log(books);
39. 39.⚡ What number does this code print?
    let a = 32;
    let b = 6;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let score = 6;
    score = score + 14;
    score = score - 4;
    console.log(score);

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