JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 569 · 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 JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
2. 2.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) alert() (d) let
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) for
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
5. 5.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) if
6. 6.⚡ What number does this code print?
   let score = 21;
   score = score + 10;
   score = score - 8;
   console.log(score);
7. 7.⚡ What number does this code print?
   let books = 20;
   books = books + 19;
   books = books - 33;
   console.log(books);
8. 8.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 4;
   console.log(x + y); (a) 74 (b) Error (c) 11
10. 10.⚡ What number does this code print?
    let score = 17;
    score = score + 12;
    score = score - 29;
    console.log(score);
11. 11.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) Hello, Kabir! (d) name
12. 12.⚡ What number does this code print?
    let a = 46;
    let b = 40;
    console.log(a + b);
13. 13.⚡ 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
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, name! (d) Well done, Kabir!
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 49 (c) 13
16. 16.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) Error (c) 18
18. 18.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) for (d) alert()
19. 19.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 7;
    apples = apples - 9;
    console.log(apples);
20. 20.⚡ What number does this code print?
    let a = 16;
    let b = 15;
    console.log(a + b);
21. 21.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) 72 (c) Error
23. 23.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 3 (b) Error (c) 21
25. 25.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) Hi, Zoya! (d) name
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 15 (b) Error (c) 78
27. 27.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Aman (c) name (d) Welcome, name!
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) 3 (c) Error
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) Error (b) 11 (c) 92
30. 30.⚡ What number does this code print?
    let a = 51;
    let b = 7;
    console.log(a - b);
31. 31.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) for
32. 32.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Aman! (d) Aman
33. 33.⚡ What number does this code print?
    let a = 40;
    let b = 39;
    console.log(a - b);
34. 34.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) Error (b) 9 (c) 36
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 16 (b) Error (c) 97
37. 37.⚡ What number does this code print?
    let score = 15;
    score = score + 2;
    score = score - 13;
    console.log(score);
38. 38.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 5;
    coins = coins - 28;
    console.log(coins);
39. 39.⚡ What number does this code print?
    let books = 22;
    books = books + 14;
    books = books - 25;
    console.log(books);
40. 40.⚡ What number does this code print?
    let a = 34;
    let b = 3;
    console.log(a - b);

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