JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 839 · 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 apples = 8;
   apples = apples + 4;
   apples = apples - 3;
   console.log(apples);
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) console.log() (d) alert()
3. 3.⚡ What number does this code print?
   let a = 38;
   let b = 18;
   console.log(a + b);
4. 4.⚡ What number does this code print?
   let books = 21;
   books = books + 20;
   books = books - 11;
   console.log(books);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 9;
   console.log(x + y); (a) Error (b) 29 (c) 11
6. 6.⚡ What number does this code print?
   let coins = 21;
   coins = coins + 9;
   coins = coins - 4;
   console.log(coins);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 4;
   console.log(x + y); (a) 12 (b) 84 (c) Error
8. 8.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) if (d) let
9. 9.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
10. 10.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
11. 11.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 6 (b) Error (c) 51
13. 13.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put
14. 14.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) for (d) if
15. 15.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
16. 16.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
17. 17.⚡ What number does this code print?
    let a = 39;
    let b = 26;
    console.log(a - b);
18. 18.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) Hello, name! (c) name (d) Arjun
19. 19.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
20. 20.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) name (c) Aman (d) Hello, name!
21. 21.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) alert() (d) console.log()
22. 22.⚡ What number does this code print?
    let runs = 22;
    runs = runs + 10;
    runs = runs - 7;
    console.log(runs);
23. 23.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 8;
    runs = runs - 3;
    console.log(runs);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) Error (c) 66
25. 25.⚡ What number does this code print?
    let a = 39;
    let b = 27;
    console.log(a - b);
26. 26.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 5;
    coins = coins - 34;
    console.log(coins);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) 5 (c) Error
28. 28.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let score = 26;
    score = score + 12;
    score = score - 26;
    console.log(score);
30. 30.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Arjun (c) Welcome, name! (d) name
31. 31.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 72 (c) 9
33. 33.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
34. 34.⚡ What number does this code print?
    let a = 44;
    let b = 17;
    console.log(a + b);
35. 35.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) if (d) for
36. 36.⚡ What number does this code print?
    let a = 8;
    let b = 3;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 16;
    marks = marks - 3;
    console.log(marks);
38. 38.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Arjun! (c) name (d) Arjun
39. 39.⚡ What number does this code print?
    let a = 25;
    let b = 20;
    console.log(a + b);
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Riya! (c) Well done, name! (d) Riya

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