JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 673 · 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 a = 9;
   let b = 3;
   console.log(a * b);
2. 2.⚡ What number does this code print?
   let books = 27;
   books = books + 9;
   books = books - 10;
   console.log(books);
3. 3.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
4. 4.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) for (d) alert()
5. 5.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
6. 6.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) let
7. 7.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) for (d) let
9. 9.⚡ What number does this code print?
   let marks = 29;
   marks = marks + 14;
   marks = marks - 40;
   console.log(marks);
10. 10.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
11. 11.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Hi, name! (d) Kabir
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
13. 13.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) Hello, name! (d) name
14. 14.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Arjun (d) Well done, Arjun!
15. 15.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
16. 16.⚡ What number does this code print?
    let a = 27;
    let b = 9;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let books = 13;
    books = books + 13;
    books = books - 5;
    console.log(books);
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Riya (d) Well done, Riya!
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) Error (b) 14 (c) 68
20. 20.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 17;
    apples = apples - 13;
    console.log(apples);
21. 21.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 19;
    runs = runs - 5;
    console.log(runs);
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 does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) Error (b) 10 (c) 37
24. 24.⚡ What number does this code print?
    let books = 7;
    books = books + 8;
    books = books - 12;
    console.log(books);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 91 (c) 10
26. 26.⚡ What number does this code print?
    let a = 6;
    let b = 9;
    console.log(a * b);
27. 27.⚡ What number does this code print?
    let books = 23;
    books = books + 13;
    books = books - 20;
    console.log(books);
28. 28.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 5;
    apples = apples - 17;
    console.log(apples);
29. 29.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Aman! (d) Aman
30. 30.⚡ What number does this code print?
    let a = 57;
    let b = 28;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let books = 23;
    books = books + 5;
    books = books - 1;
    console.log(books);
32. 32.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Kabir (d) Welcome, Kabir!
33. 33.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) name (c) Hi, name! (d) Arjun
34. 34.⚡ Which JavaScript word repeats code? (a) let (b) if (c) console.log() (d) for
35. 35.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
36. 36.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) Zoya (c) name (d) Well done, name!
37. 37.⚡ What number does this code print?
    let a = 30;
    let b = 14;
    console.log(a - b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) Error (c) 9
39. 39.⚡ What number does this code print?
    let books = 22;
    books = books + 14;
    books = books - 2;
    console.log(books);
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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