JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 41 · 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 word makes a new variable? (a) give (b) make (c) put (d) let
2. 2.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
3. 3.⚡ What number does this code print?
   let a = 18;
   let b = 8;
   console.log(a - b);
4. 4.⚡ What number does this code print?
   let books = 18;
   books = books + 9;
   books = books - 8;
   console.log(books);
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) if
6. 6.⚡ What number does this code print?
   let marks = 11;
   marks = marks + 15;
   marks = marks - 6;
   console.log(marks);
7. 7.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
8. 8.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) let (d) console.log()
9. 9.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) if (d) alert()
10. 10.⚡ What number does this code print?
    let a = 13;
    let b = 20;
    console.log(a + b);
11. 11.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Kabir (d) Hi, name!
12. 12.⚡ Which JavaScript word repeats code? (a) let (b) for (c) alert() (d) console.log()
13. 13.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) name (d) Welcome, Riya!
14. 14.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Hi, name! (d) Aman
15. 15.⚡ What number does this code print?
    let a = 20;
    let b = 16;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 9;
    apples = apples - 15;
    console.log(apples);
17. 17.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
18. 18.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) if (d) alert()
19. 19.⚡ What number does this code print?
    let books = 27;
    books = books + 10;
    books = books - 20;
    console.log(books);
20. 20.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Hello, name! (c) name (d) Meera
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) Error (b) 63 (c) 9
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) Error (b) 94 (c) 13
23. 23.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 17;
    apples = apples - 2;
    console.log(apples);
24. 24.⚡ What number does this code print?
    let a = 34;
    let b = 26;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 24;
    let b = 12;
    console.log(a - b);
26. 26.⚡ What number does this code print?
    let a = 11;
    let b = 33;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 7;
    let b = 12;
    console.log(a * b);
28. 28.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 17;
    apples = apples - 3;
    console.log(apples);
29. 29.⚡ What number does this code print?
    let a = 10;
    let b = 5;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let a = 25;
    let b = 24;
    console.log(a - b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 9 (c) 81
33. 33.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 22 (c) 4
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) Error (b) 17 (c) 8
36. 36.⚡ What number does this code print?
    let books = 11;
    books = books + 12;
    books = books - 5;
    console.log(books);
37. 37.⚡ What number does this code print?
    let a = 42;
    let b = 30;
    console.log(a - b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) Error (b) 19 (c) 10
39. 39.⚡ What number does this code print?
    let a = 11;
    let b = 11;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Aman (d) Hello, Aman!

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