JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 334 · 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) on the title bar (b) in the address bar (c) on the printer (d) in the console
2. 2.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
3. 3.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) for (d) let
4. 4.⚡ What number does this code print?
   let coins = 25;
   coins = coins + 11;
   coins = coins - 5;
   console.log(coins);
5. 5.⚡ What number does this code print?
   let books = 23;
   books = books + 3;
   books = books - 4;
   console.log(books);
6. 6.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
7. 7.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) if
8. 8.⚡ What number does this code print?
   let books = 20;
   books = books + 13;
   books = books - 14;
   console.log(books);
9. 9.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) for (d) if
10. 10.⚡ What number does this code print?
    let a = 34;
    let b = 14;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let a = 19;
    let b = 3;
    console.log(a - b);
12. 12.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) if (d) for
13. 13.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, Zoya! (d) Welcome, name!
14. 14.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Zoya (d) Hi, Zoya!
15. 15.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 16;
    apples = apples - 1;
    console.log(apples);
16. 16.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Kabir! (d) Kabir
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) Error (b) 85 (c) 13
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) alert() (d) console.log()
19. 19.⚡ What number does this code print?
    let a = 35;
    let b = 28;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 14;
    let b = 3;
    console.log(a - b);
21. 21.⚡ What number does this code print?
    let a = 30;
    let b = 16;
    console.log(a - b);
22. 22.⚡ 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!
23. 23.⚡ What number does this code print?
    let a = 34;
    let b = 18;
    console.log(a - b);
24. 24.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 7;
    coins = coins - 7;
    console.log(coins);
25. 25.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
26. 26.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
27. 27.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Meera (c) Well done, Meera! (d) name
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) Error (c) 53
29. 29.⚡ What number does this code print?
    let a = 36;
    let b = 16;
    console.log(a + b);
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Aman! (c) Aman (d) Welcome, name!
31. 31.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Arjun! (c) name (d) Arjun
32. 32.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) Arjun (c) name (d) Hello, name!
33. 33.⚡ What number does this code print?
    let a = 16;
    let b = 3;
    console.log(a + b);
34. 34.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) name (c) Hi, name! (d) Hi, Zoya!
35. 35.⚡ What number does this code print?
    let a = 16;
    let b = 14;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 17;
    apples = apples - 4;
    console.log(apples);
37. 37.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
38. 38.⚡ What number does this code print?
    let a = 11;
    let b = 33;
    console.log(a + b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) 31 (c) Error
40. 40.⚡ What number does this code print?
    let score = 11;
    score = score + 13;
    score = score - 21;
    console.log(score);

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