JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 845 · 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 tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
2. 2.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Aman (d) Welcome, Aman!
3. 3.⚡ What number does this code print?
   let runs = 30;
   runs = runs + 10;
   runs = runs - 34;
   console.log(runs);
4. 4.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, Arjun! (c) Arjun (d) Well done, name!
5. 5.⚡ What number does this code print?
   let apples = 26;
   apples = apples + 9;
   apples = apples - 20;
   console.log(apples);
6. 6.⚡ What number does this code print?
   let coins = 27;
   coins = coins + 18;
   coins = coins - 42;
   console.log(coins);
7. 7.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
8. 8.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
9. 9.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) name (c) Hello, name! (d) Aman
10. 10.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) if (d) for
11. 11.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) if
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) Error (b) 34 (c) 7
13. 13.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) name (c) Welcome, name! (d) Arjun
14. 14.⚡ What number does this code print?
    let a = 12;
    let b = 3;
    console.log(a * b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) 66 (c) Error
16. 16.⚡ Which JavaScript word repeats code? (a) if (b) for (c) alert() (d) console.log()
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) Error (b) 65 (c) 11
18. 18.⚡ What number does this code print?
    let a = 23;
    let b = 11;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let a = 30;
    let b = 4;
    console.log(a + b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 31 (b) Error (c) 4
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) for (d) let
22. 22.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) alert()
23. 23.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, name! (d) Hi, Meera!
24. 24.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 16;
    runs = runs - 30;
    console.log(runs);
26. 26.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) name (c) Welcome, Riya! (d) Welcome, name!
27. 27.⚡ What number does this code print?
    let a = 44;
    let b = 12;
    console.log(a - b);
28. 28.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) Hi, Kabir! (d) name
29. 29.⚡ 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
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
31. 31.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, name! (d) Well done, Aman!
32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Welcome, name! (c) Meera (d) name
33. 33.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 3;
    coins = coins - 10;
    console.log(coins);
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) Hi, Riya! (d) name
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 15 (b) 6 (c) Error
36. 36.⚡ What number does this code print?
    let a = 22;
    let b = 24;
    console.log(a + b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 10 (b) Error (c) 37
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) 81 (c) Error
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 59 (b) Error (c) 14
40. 40.⚡ What number does this code print?
    let a = 19;
    let b = 6;
    console.log(a - b);

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