JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 684 · 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.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
2. 2.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Kabir (d) Welcome, Kabir!
3. 3.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) let (d) alert()
5. 5.⚡ What number does this code print?
   let apples = 15;
   apples = apples + 8;
   apples = apples - 14;
   console.log(apples);
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 8;
   console.log(x + y); (a) 9 (b) 18 (c) Error
7. 7.⚡ What number does this code print?
   let books = 8;
   books = books + 4;
   books = books - 11;
   console.log(books);
8. 8.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) name (d) Welcome, Riya!
9. 9.⚡ What number does this code print?
   let a = 36;
   let b = 13;
   console.log(a - b);
10. 10.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
11. 11.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) name (d) Riya
12. 12.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) for
13. 13.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) for
14. 14.⚡ 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
15. 15.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
16. 16.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
17. 17.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 7;
    apples = apples - 18;
    console.log(apples);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 61 (c) 7
19. 19.⚡ What number does this code print?
    let a = 6;
    let b = 6;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let a = 55;
    let b = 2;
    console.log(a - b);
21. 21.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Meera! (d) Meera
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 9 (c) 72
23. 23.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) 43 (c) Error
25. 25.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) let
26. 26.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 14;
    coins = coins - 9;
    console.log(coins);
27. 27.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
28. 28.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 7;
    apples = apples - 1;
    console.log(apples);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) 34 (c) Error
30. 30.⚡ What number does this code print?
    let books = 24;
    books = books + 2;
    books = books - 6;
    console.log(books);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 33 (b) 6 (c) Error
32. 32.⚡ What number does this code print?
    let a = 40;
    let b = 5;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 17;
    runs = runs - 32;
    console.log(runs);
34. 34.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, Riya! (d) Hello, name!
35. 35.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) alert() (d) if
36. 36.⚡ What number does this code print?
    let a = 22;
    let b = 16;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 6;
    runs = runs - 10;
    console.log(runs);
38. 38.⚡ What number does this code print?
    let a = 29;
    let b = 4;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, name! (c) name (d) Hi, Meera!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 83 (b) Error (c) 11

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