JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 576 · 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 makes a new variable? (a) if (b) let (c) console.log() (d) for
2. 2.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
3. 3.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
5. 5.⚡ What does this code show?
   let name = "Meera";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) Welcome, Meera! (d) name
6. 6.⚡ What number does this code print?
   let score = 16;
   score = score + 4;
   score = score - 5;
   console.log(score);
7. 7.⚡ What number does this code print?
   let a = 10;
   let b = 8;
   console.log(a * b);
8. 8.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
9. 9.⚡ What number does this code print?
   let score = 5;
   score = score + 7;
   score = score - 12;
   console.log(score);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) Error (c) 41
11. 11.⚡ What number does this code print?
    let a = 8;
    let b = 4;
    console.log(a * b);
12. 12.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) let (d) console.log()
13. 13.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) let
14. 14.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, name! (d) Well done, Aman!
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) let
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) Error (b) 15 (c) 69
17. 17.⚡ What number does this code print?
    let books = 14;
    books = books + 16;
    books = books - 27;
    console.log(books);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 9 (c) 27
19. 19.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 19;
    apples = apples - 1;
    console.log(apples);
20. 20.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Meera (c) Well done, Meera! (d) Well done, name!
21. 21.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) alert() (d) if
22. 22.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
23. 23.⚡ What number does this code print?
    let a = 10;
    let b = 4;
    console.log(a * b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 12 (b) 57 (c) Error
25. 25.⚡ What number does this code print?
    let a = 6;
    let b = 4;
    console.log(a + b);
26. 26.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Meera (d) Hi, Meera!
27. 27.⚡ What number does this code print?
    let a = 19;
    let b = 24;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let score = 30;
    score = score + 14;
    score = score - 22;
    console.log(score);
29. 29.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a * b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) Error (b) 12 (c) 3
31. 31.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
32. 32.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
33. 33.⚡ What number does this code print?
    let a = 4;
    let b = 8;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Kabir! (c) Kabir (d) Hi, name!
35. 35.⚡ What number does this code print?
    let a = 23;
    let b = 7;
    console.log(a - b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 32 (c) 5
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Aman (d) Well done, Aman!
38. 38.⚡ What number does this code print?
    let a = 31;
    let b = 30;
    console.log(a - b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 29 (b) 11 (c) Error
40. 40.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes

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