JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 460 · 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 JavaScript word writes in the console? (a) if (b) console.log() (c) for (d) alert()
2. 2.⚡ Which JavaScript word repeats code? (a) let (b) for (c) console.log() (d) if
3. 3.⚡ What number does this code print?
   let apples = 23;
   apples = apples + 6;
   apples = apples - 17;
   console.log(apples);
4. 4.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
5. 5.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
6. 6.⚡ What number does this code print?
   let books = 6;
   books = books + 15;
   books = books - 7;
   console.log(books);
7. 7.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) for (d) alert()
8. 8.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Hello, name! (d) Zoya
9. 9.⚡ What number does this code print?
   let score = 11;
   score = score + 11;
   score = score - 11;
   console.log(score);
10. 10.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 5;
    apples = apples - 4;
    console.log(apples);
11. 11.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) if (d) for
12. 12.⚡ What number does this code print?
    let a = 10;
    let b = 12;
    console.log(a + b);
13. 13.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Arjun! (c) Hello, name! (d) Arjun
14. 14.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Hello, name! (c) Zoya (d) name
15. 15.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
16. 16.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
17. 17.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) Well done, Arjun! (c) name (d) Well done, name!
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, name! (d) Hello, Aman!
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 15 (c) 6
20. 20.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
22. 22.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, name! (c) name (d) Hello, Meera!
23. 23.⚡ What number does this code print?
    let a = 56;
    let b = 37;
    console.log(a - b);
24. 24.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 12;
    marks = marks - 4;
    console.log(marks);
25. 25.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) let
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) 77 (c) Error
27. 27.⚡ What number does this code print?
    let a = 36;
    let b = 33;
    console.log(a - b);
28. 28.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name
29. 29.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Kabir! (c) name (d) Kabir
30. 30.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) Aman (d) name
31. 31.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 85 (b) Error (c) 13
33. 33.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Aman! (c) Well done, name! (d) Aman
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) name (c) Welcome, name! (d) Welcome, Riya!
35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) Welcome, name! (d) name
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 19 (b) 10 (c) Error
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) 5 (c) Error
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
39. 39.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 87 (b) Error (c) 15

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