JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 307 · 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 this code print? (Look at the quotes!)
   let x = "5";
   let y = 2;
   console.log(x + y); (a) Error (b) 7 (c) 52
2. 2.⚡ What number does this code print?
   let a = 38;
   let b = 36;
   console.log(a + b);
3. 3.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
4. 4.⚡ What number does this code print?
   let apples = 30;
   apples = apples + 2;
   apples = apples - 25;
   console.log(apples);
5. 5.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
6. 6.⚡ What number does this code print?
   let apples = 5;
   apples = apples + 13;
   apples = apples - 12;
   console.log(apples);
7. 7.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) alert()
8. 8.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) console.log() (d) for
9. 9.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) Welcome, Aman! (d) name
10. 10.⚡ What number does this code print?
    let a = 14;
    let b = 13;
    console.log(a - b);
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) let
12. 12.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) Error (b) 12 (c) 75
15. 15.⚡ What number does this code print?
    let a = 33;
    let b = 26;
    console.log(a + b);
16. 16.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
17. 17.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) let (d) if
18. 18.⚡ What number does this code print?
    let a = 2;
    let b = 8;
    console.log(a * b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 95 (c) 14
20. 20.⚡ What number does this code print?
    let a = 55;
    let b = 1;
    console.log(a - b);
21. 21.⚡ What number does this code print?
    let a = 10;
    let b = 8;
    console.log(a - b);
22. 22.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Arjun (d) Hi, Arjun!
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) Error (b) 14 (c) 86
24. 24.⚡ What number does this code print?
    let a = 47;
    let b = 32;
    console.log(a + b);
25. 25.⚡ 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
26. 26.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) for (d) let
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 10 (c) 82
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 5 (b) Error (c) 14
29. 29.⚡ What number does this code print?
    let a = 12;
    let b = 6;
    console.log(a * b);
30. 30.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Arjun (d) Hi, Arjun!
31. 31.⚡ What number does this code print?
    let books = 15;
    books = books + 18;
    books = books - 20;
    console.log(books);
32. 32.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) name (c) Zoya (d) Hi, name!
33. 33.⚡ What number does this code print?
    let score = 26;
    score = score + 13;
    score = score - 17;
    console.log(score);
34. 34.⚡ What number does this code print?
    let a = 26;
    let b = 16;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let a = 37;
    let b = 6;
    console.log(a + b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 5 (b) 23 (c) Error
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 78 (b) 15 (c) Error
38. 38.⚡ What number does this code print?
    let a = 15;
    let b = 14;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 6;
    apples = apples - 21;
    console.log(apples);
40. 40.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Aman (d) Hi, Aman!

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