JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 600 · 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 does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
2. 2.⚡ What does this code show?
   let name = "Meera";
   console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) name (d) Welcome, name!
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 4;
   console.log(x + y); (a) Error (b) 34 (c) 7
4. 4.⚡ What does this code show?
   let name = "Aman";
   console.log("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, name! (d) Well done, Aman!
5. 5.⚡ What does this code show?
   let name = "Aman";
   console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, Aman! (d) Hi, name!
6. 6.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 1;
   console.log(x + y); (a) 7 (b) 61 (c) Error
8. 8.⚡ What number does this code print?
   let a = 10;
   let b = 8;
   console.log(a * b);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 3;
   console.log(x + y); (a) Error (b) 13 (c) 4
10. 10.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) if (d) console.log()
11. 11.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) console.log() (d) let
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) Error (c) 44
13. 13.⚡ Which JavaScript word repeats code? (a) if (b) for (c) alert() (d) console.log()
14. 14.⚡ 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
15. 15.⚡ What number does this code print?
    let a = 3;
    let b = 8;
    console.log(a * b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 5 (c) 23
17. 17.⚡ 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
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) Riya (d) name
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 13 (c) 49
20. 20.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 54;
    let b = 28;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let books = 13;
    books = books + 4;
    books = books - 14;
    console.log(books);
23. 23.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, Zoya! (b) Hello, name! (c) name (d) Zoya
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 22 (b) Error (c) 4
25. 25.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
26. 26.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) name (c) Hi, name! (d) Hi, Arjun!
28. 28.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
29. 29.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, name! (d) Well done, Riya!
30. 30.⚡ What number does this code print?
    let a = 40;
    let b = 10;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 9;
    marks = marks - 8;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 26;
    let b = 2;
    console.log(a + b);
34. 34.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Kabir! (c) Hi, name! (d) Kabir
35. 35.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 19;
    marks = marks - 10;
    console.log(marks);
36. 36.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) Error (c) 63
38. 38.⚡ What number does this code print?
    let a = 17;
    let b = 17;
    console.log(a - b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 27 (b) 9 (c) Error
40. 40.⚡ What number does this code print?
    let a = 55;
    let b = 22;
    console.log(a + b);

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