JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 981 · 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 does this code print? (Look at the quotes!)
   let x = "7";
   let y = 8;
   console.log(x + y); (a) Error (b) 78 (c) 15
2. 2.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) let (d) if
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 9;
   console.log(x + y); (a) 10 (b) Error (c) 19
4. 4.⚡ What number does this code print?
   let a = 21;
   let b = 10;
   console.log(a - b);
5. 5.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
6. 6.⚡ What number does this code print?
   let a = 20;
   let b = 26;
   console.log(a + b);
7. 7.⚡ What number does this code print?
   let a = 11;
   let b = 24;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let a = 34;
   let b = 29;
   console.log(a - b);
9. 9.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Arjun (c) Hello, Arjun! (d) name
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 63 (b) 9 (c) Error
11. 11.⚡ What number does this code print?
    let a = 46;
    let b = 1;
    console.log(a - b);
12. 12.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 4;
    coins = coins - 4;
    console.log(coins);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) Error (b) 14 (c) 77
14. 14.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) Welcome, Zoya! (d) name
15. 15.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
16. 16.⚡ What number does this code print?
    let a = 22;
    let b = 14;
    console.log(a - b);
17. 17.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Meera! (d) Meera
18. 18.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Welcome, name! (d) Kabir
19. 19.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Zoya! (c) Zoya (d) name
20. 20.⚡ What number does this code print?
    let books = 17;
    books = books + 11;
    books = books - 18;
    console.log(books);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 79 (c) 16
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) Error (b) 28 (c) 10
23. 23.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2
25. 25.⚡ What number does this code print?
    let a = 36;
    let b = 24;
    console.log(a - b);
26. 26.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) for (d) alert()
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 69 (b) Error (c) 15
28. 28.⚡ What number does this code print?
    let a = 56;
    let b = 12;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 9;
    marks = marks - 4;
    console.log(marks);
30. 30.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) name (d) Riya
31. 31.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) alert() (d) let
32. 32.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 7;
    apples = apples - 1;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 7;
    coins = coins - 10;
    console.log(coins);
35. 35.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) for (d) console.log()
36. 36.⚡ What number does this code print?
    let a = 42;
    let b = 12;
    console.log(a + b);
37. 37.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) name (c) Zoya (d) Hi, name!
38. 38.⚡ What number does this code print?
    let a = 50;
    let b = 13;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 5;
    runs = runs - 3;
    console.log(runs);
40. 40.⚡ What number does this code print?
    let a = 6;
    let b = 20;
    console.log(a + b);

Free html and css lessons, practice and worksheets at talentjr.in/html-css-for-kids