JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 824 · 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 number does this code print?
   let score = 21;
   score = score + 4;
   score = score - 20;
   console.log(score);
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) for (d) alert()
3. 3.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
4. 4.⚡ What number does this code print?
   let a = 28;
   let b = 40;
   console.log(a + b);
5. 5.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
6. 6.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) console.log() (d) for
7. 7.⚡ What number does this code print?
   let a = 8;
   let b = 9;
   console.log(a * b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 6;
   console.log(x + y); (a) 8 (b) 26 (c) Error
9. 9.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
10. 10.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) if
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 46 (b) Error (c) 10
12. 12.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) if (d) let
13. 13.⚡ What number does this code print?
    let a = 15;
    let b = 6;
    console.log(a + b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) 83 (c) Error
15. 15.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 20;
    apples = apples - 26;
    console.log(apples);
16. 16.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
17. 17.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
19. 19.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) alert()
20. 20.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Zoya (d) Hi, Zoya!
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 95 (b) 14 (c) Error
23. 23.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a - b);
24. 24.⚡ What number does this code print?
    let a = 35;
    let b = 22;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let a = 55;
    let b = 18;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 44;
    let b = 39;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 10;
    coins = coins - 6;
    console.log(coins);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) Error (b) 15 (c) 78
29. 29.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
30. 30.⚡ What number does this code print?
    let books = 9;
    books = books + 19;
    books = books - 17;
    console.log(books);
31. 31.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 13;
    runs = runs - 22;
    console.log(runs);
32. 32.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, Meera! (b) Well done, name! (c) name (d) Meera
33. 33.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
34. 34.⚡ 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
35. 35.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 7;
    marks = marks - 1;
    console.log(marks);
36. 36.⚡ What number does this code print?
    let a = 55;
    let b = 1;
    console.log(a - b);
37. 37.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 7 (c) 61
39. 39.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, name! (d) Hello, Arjun!
40. 40.⚡ What number does this code print?
    let a = 3;
    let b = 2;
    console.log(a * b);

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