JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 256 · 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.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
2. 2.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
3. 3.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
4. 4.⚡ What number does this code print?
   let score = 17;
   score = score + 16;
   score = score - 11;
   console.log(score);
5. 5.⚡ What number does this code print?
   let apples = 25;
   apples = apples + 2;
   apples = apples - 3;
   console.log(apples);
6. 6.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) let
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) for
8. 8.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) for
9. 9.⚡ What number does this code print?
   let marks = 30;
   marks = marks + 11;
   marks = marks - 37;
   console.log(marks);
10. 10.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 3;
    runs = runs - 22;
    console.log(runs);
11. 11.⚡ What number does this code print?
    let a = 17;
    let b = 14;
    console.log(a + b);
12. 12.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
13. 13.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) Error (c) 43
15. 15.⚡ 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
16. 16.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) let
17. 17.⚡ What number does this code print?
    let a = 38;
    let b = 27;
    console.log(a + b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 12 (b) Error (c) 57
19. 19.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) if (d) console.log()
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) Error (c) 12
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) Error (b) 10 (c) 55
22. 22.⚡ What number does this code print?
    let a = 60;
    let b = 8;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let a = 11;
    let b = 6;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let a = 53;
    let b = 22;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let books = 29;
    books = books + 17;
    books = books - 23;
    console.log(books);
26. 26.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Meera (c) Well done, Meera! (d) name
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) 41 (c) Error
28. 28.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
29. 29.⚡ What number does this code print?
    let a = 3;
    let b = 10;
    console.log(a * b);
30. 30.⚡ 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
31. 31.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Hi, name! (d) Meera
32. 32.⚡ What number does this code print?
    let a = 10;
    let b = 13;
    console.log(a + b);
33. 33.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Arjun (d) Well done, Arjun!
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Riya (c) name (d) Hello, name!
35. 35.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let a = 5;
    let b = 9;
    console.log(a * b);
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, name! (d) Well done, Aman!
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Riya (d) Welcome, Riya!
39. 39.⚡ 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
40. 40.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 10;
    runs = runs - 31;
    console.log(runs);

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