JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 592 · 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 runs code when true? (a) alert() (b) console.log() (c) let (d) if
2. 2.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
3. 3.⚡ What number does this code print?
   let apples = 13;
   apples = apples + 9;
   apples = apples - 11;
   console.log(apples);
4. 4.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) for (d) console.log()
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
6. 6.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Kabir (d) Welcome, name!
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) for (d) let
8. 8.⚡ Which JavaScript word repeats code? (a) if (b) let (c) alert() (d) for
9. 9.⚡ What number does this code print?
   let score = 19;
   score = score + 5;
   score = score - 11;
   console.log(score);
10. 10.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 89 (b) 17 (c) Error
12. 12.⚡ What number does this code print?
    let a = 35;
    let b = 29;
    console.log(a - b);
13. 13.⚡ What number does this code print?
    let a = 31;
    let b = 1;
    console.log(a - b);
14. 14.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
15. 15.⚡ What number does this code print?
    let a = 6;
    let b = 7;
    console.log(a * b);
16. 16.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) let (d) alert()
17. 17.⚡ 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
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 65 (b) 11 (c) Error
19. 19.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
20. 20.⚡ What number does this code print?
    let a = 29;
    let b = 4;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 3;
    runs = runs - 9;
    console.log(runs);
22. 22.⚡ What number does this code print?
    let a = 16;
    let b = 9;
    console.log(a + b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) Error (c) 33
24. 24.⚡ What number does this code print?
    let a = 31;
    let b = 12;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 11;
    marks = marks - 8;
    console.log(marks);
26. 26.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, Zoya! (b) Zoya (c) Hello, name! (d) name
27. 27.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 16;
    apples = apples - 40;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let books = 20;
    books = books + 2;
    books = books - 15;
    console.log(books);
29. 29.⚡ What number does this code print?
    let books = 21;
    books = books + 11;
    books = books - 9;
    console.log(books);
30. 30.⚡ What number does this code print?
    let a = 48;
    let b = 37;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let a = 25;
    let b = 39;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 9;
    runs = runs - 12;
    console.log(runs);
33. 33.⚡ What number does this code print?
    let a = 36;
    let b = 4;
    console.log(a + b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) Error (b) 46 (c) 10
35. 35.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
36. 36.⚡ What number does this code print?
    let a = 12;
    let b = 35;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 15;
    marks = marks - 2;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let a = 39;
    let b = 18;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) Hello, name! (d) name
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 43 (c) 7

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