JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 371 · 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 = 16;
   apples = apples + 11;
   apples = apples - 8;
   console.log(apples);
2. 2.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) Hi, name! (d) name
3. 3.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) for (d) let
4. 4.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) for (d) let
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
6. 6.⚡ What number does this code print?
   let marks = 10;
   marks = marks + 2;
   marks = marks - 9;
   console.log(marks);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 9;
   console.log(x + y); (a) 69 (b) Error (c) 15
8. 8.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
9. 9.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a new tab (d) a picture
10. 10.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Arjun! (c) Arjun (d) name
11. 11.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 6;
    apples = apples - 1;
    console.log(apples);
12. 12.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) alert() (d) if
13. 13.⚡ What number does this code print?
    let a = 36;
    let b = 22;
    console.log(a - b);
14. 14.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
15. 15.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
16. 16.⚡ What number does this code print?
    let a = 22;
    let b = 13;
    console.log(a - b);
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) for
18. 18.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Arjun! (d) Arjun
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 12 (b) 93 (c) Error
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 64 (b) 10 (c) Error
21. 21.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Riya! (d) Riya
22. 22.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, Zoya! (d) Hello, name!
23. 23.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Aman (d) Hello, Aman!
24. 24.⚡ What number does this code print?
    let a = 49;
    let b = 34;
    console.log(a - b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) 44 (c) Error
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) 48 (c) Error
27. 27.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) Hi, Arjun! (d) name
28. 28.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 82 (c) 10
30. 30.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) Error (c) 25
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) 43 (c) Error
33. 33.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) Hello, Aman! (d) name
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) Error (b) 11 (c) 83
35. 35.⚡ What number does this code print?
    let books = 19;
    books = books + 9;
    books = books - 1;
    console.log(books);
36. 36.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) name (c) Zoya (d) Well done, name!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) Error (b) 37 (c) 10
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 76 (b) 13 (c) Error
39. 39.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) let
40. 40.⚡ What number does this code print?
    let a = 56;
    let b = 27;
    console.log(a + b);

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