JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 351 · 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 = 8;
   score = score + 18;
   score = score - 11;
   console.log(score);
2. 2.⚡ What number does this code print?
   let apples = 6;
   apples = apples + 8;
   apples = apples - 13;
   console.log(apples);
3. 3.⚡ What number does this code print?
   let a = 21;
   let b = 33;
   console.log(a + b);
4. 4.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) let
6. 6.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
7. 7.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
8. 8.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) name (d) Hello, Riya!
9. 9.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Hi, name! (c) name (d) Riya
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 13 (b) Error (c) 76
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
12. 12.⚡ What number does this code print?
    let a = 53;
    let b = 38;
    console.log(a + b);
13. 13.⚡ What number does this code print?
    let a = 3;
    let b = 2;
    console.log(a * b);
14. 14.⚡ What number does this code print?
    let a = 32;
    let b = 6;
    console.log(a + b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) Error (b) 12 (c) 75
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 9 (c) 27
17. 17.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, name! (d) Hello, Meera!
18. 18.⚡ What number does this code print?
    let a = 52;
    let b = 22;
    console.log(a - b);
19. 19.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
20. 20.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
21. 21.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) for (d) if
22. 22.⚡ What number does this code print?
    let a = 60;
    let b = 13;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let a = 6;
    let b = 7;
    console.log(a * b);
24. 24.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, Aman! (d) Hello, name!
25. 25.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) for (d) console.log()
26. 26.⚡ What number does this code print?
    let a = 47;
    let b = 9;
    console.log(a - b);
27. 27.⚡ What number does this code print?
    let a = 13;
    let b = 11;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 15;
    runs = runs - 33;
    console.log(runs);
29. 29.⚡ Which JavaScript word repeats code? (a) for (b) let (c) if (d) console.log()
30. 30.⚡ What number does this code print?
    let a = 48;
    let b = 38;
    console.log(a - b);
31. 31.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) console.log() (d) let
32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, name! (d) Welcome, Meera!
33. 33.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) name (d) Welcome, name!
34. 34.⚡ What number does this code print?
    let a = 56;
    let b = 18;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let a = 24;
    let b = 33;
    console.log(a + b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) Error (b) 3 (c) 12
37. 37.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 10;
    apples = apples - 1;
    console.log(apples);
38. 38.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 5;
    coins = coins - 5;
    console.log(coins);
39. 39.⚡ What number does this code print?
    let books = 5;
    books = books + 16;
    books = books - 9;
    console.log(books);
40. 40.⚡ What number does this code print?
    let a = 29;
    let b = 5;
    console.log(a - b);

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