JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 777 · 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 apples = 26;
   apples = apples + 10;
   apples = apples - 29;
   console.log(apples);
2. 2.⚡ What number does this code print?
   let a = 60;
   let b = 37;
   console.log(a + b);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 3;
   console.log(x + y); (a) 8 (b) Error (c) 53
4. 4.⚡ What number does this code print?
   let coins = 7;
   coins = coins + 8;
   coins = coins - 5;
   console.log(coins);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 7;
   console.log(x + y); (a) 97 (b) Error (c) 16
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) let
7. 7.⚡ What number does this code print?
   let apples = 8;
   apples = apples + 13;
   apples = apples - 21;
   console.log(apples);
8. 8.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
9. 9.⚡ What number does this code print?
   let a = 51;
   let b = 7;
   console.log(a + b);
10. 10.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!
11. 11.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
12. 12.⚡ What number does this code print?
    let a = 18;
    let b = 14;
    console.log(a - b);
13. 13.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) console.log() (d) if
14. 14.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Hello, name! (d) Aman
15. 15.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) if (d) for
16. 16.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
17. 17.⚡ What number does this code print?
    let a = 8;
    let b = 3;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let score = 12;
    score = score + 16;
    score = score - 23;
    console.log(score);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 3 (c) 21
20. 20.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Meera (d) Welcome, Meera!
21. 21.⚡ What number does this code print?
    let a = 36;
    let b = 10;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 18;
    coins = coins - 14;
    console.log(coins);
23. 23.⚡ What number does this code print?
    let a = 39;
    let b = 22;
    console.log(a - b);
24. 24.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) if
25. 25.⚡ What number does this code print?
    let a = 42;
    let b = 11;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let books = 23;
    books = books + 13;
    books = books - 31;
    console.log(books);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) Error (c) 81
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) Error (b) 71 (c) 8
29. 29.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
30. 30.⚡ What number does this code print?
    let a = 36;
    let b = 15;
    console.log(a - b);
31. 31.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) console.log() (d) let
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 64 (b) Error (c) 10
33. 33.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Zoya (c) Well done, Zoya! (d) name
34. 34.⚡ What number does this code print?
    let books = 30;
    books = books + 19;
    books = books - 31;
    console.log(books);
35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Riya (d) Well done, Riya!
36. 36.⚡ What number does this code print?
    let a = 47;
    let b = 32;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 20;
    apples = apples - 25;
    console.log(apples);
38. 38.⚡ What number does this code print?
    let a = 11;
    let b = 3;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let a = 22;
    let b = 20;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let books = 16;
    books = books + 9;
    books = books - 7;
    console.log(books);

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