JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 876 · 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) <code> (b) <style> (c) <script> (d) <js>
2. 2.⚡ What does this code show?
   let name = "Aman";
   console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Aman (d) Hi, name!
3. 3.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) name (d) Hi, Meera!
4. 4.⚡ What number does this code print?
   let a = 39;
   let b = 10;
   console.log(a + b);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 5;
   console.log(x + y); (a) Error (b) 10 (c) 55
6. 6.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Kabir (d) Hi, name!
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) console.log() (d) alert()
8. 8.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
9. 9.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) alert() (d) for
10. 10.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 17;
    runs = runs - 32;
    console.log(runs);
11. 11.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
12. 12.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) let
13. 13.⚡ What number does this code print?
    let a = 45;
    let b = 13;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let a = 3;
    let b = 11;
    console.log(a * b);
15. 15.⚡ What number does this code print?
    let score = 8;
    score = score + 4;
    score = score - 5;
    console.log(score);
16. 16.⚡ What number does this code print?
    let score = 6;
    score = score + 11;
    score = score - 16;
    console.log(score);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) 31 (c) Error
18. 18.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 14;
    apples = apples - 11;
    console.log(apples);
19. 19.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) name (d) Welcome, Arjun!
20. 20.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) Error (b) 76 (c) 13
22. 22.⚡ What number does this code print?
    let a = 18;
    let b = 28;
    console.log(a + b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 15 (b) 96 (c) Error
24. 24.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) Meera (c) name (d) Well done, name!
25. 25.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) if (d) let
26. 26.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) alert()
27. 27.⚡ What number does this code print?
    let a = 12;
    let b = 6;
    console.log(a * b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 8 (b) Error (c) 71
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) Error (b) 9 (c) 18
30. 30.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 14;
    runs = runs - 5;
    console.log(runs);
31. 31.⚡ What number does this code print?
    let a = 36;
    let b = 15;
    console.log(a - b);
32. 32.⚡ What number does this code print?
    let a = 24;
    let b = 13;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 8;
    marks = marks - 9;
    console.log(marks);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 82 (b) 10 (c) Error
35. 35.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 13;
    coins = coins - 21;
    console.log(coins);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 48 (b) 12 (c) Error
38. 38.⚡ What number does this code print?
    let a = 41;
    let b = 3;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 6;
    let b = 10;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let a = 19;
    let b = 16;
    console.log(a + b);

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