JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 317 · 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 repeats code? (a) alert() (b) let (c) if (d) for
2. 2.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
3. 3.⚡ What number does this code print?
   let a = 3;
   let b = 3;
   console.log(a * b);
4. 4.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
5. 5.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) if (d) console.log()
6. 6.⚡ What number does this code print?
   let a = 36;
   let b = 2;
   console.log(a + b);
7. 7.⚡ What number does this code print?
   let apples = 9;
   apples = apples + 4;
   apples = apples - 8;
   console.log(apples);
8. 8.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) only colours (d) the domain name
9. 9.⚡ What number does this code print?
   let a = 54;
   let b = 29;
   console.log(a + b);
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
11. 11.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
12. 12.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
13. 13.⚡ What number does this code print?
    let a = 34;
    let b = 20;
    console.log(a + b);
14. 14.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) name (d) Welcome, name!
15. 15.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
16. 16.⚡ 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
17. 17.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let a = 16;
    let b = 10;
    console.log(a - b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) Error (b) 13 (c) 67
20. 20.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 11;
    coins = coins - 1;
    console.log(coins);
21. 21.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Arjun! (c) Arjun (d) Well done, name!
22. 22.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) alert() (d) console.log()
23. 23.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Kabir (d) Hi, Kabir!
24. 24.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) console.log()
25. 25.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) console.log() (d) let
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 26 (b) Error (c) 8
27. 27.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) Hi, name! (c) Hi, Zoya! (d) name
28. 28.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) Error (b) 86 (c) 14
30. 30.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 6;
    coins = coins - 15;
    console.log(coins);
31. 31.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 12;
    coins = coins - 5;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 5;
    apples = apples - 4;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let books = 29;
    books = books + 13;
    books = books - 40;
    console.log(books);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) Error (b) 24 (c) 6
35. 35.⚡ What number does this code print?
    let a = 13;
    let b = 1;
    console.log(a - b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 15 (b) Error (c) 78
37. 37.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 2;
    marks = marks - 14;
    console.log(marks);
38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 11 (b) Error (c) 47
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 79 (c) 16

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