JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 681 · 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 + 9;
   score = score - 1;
   console.log(score);
2. 2.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
3. 3.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
4. 4.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
5. 5.⚡ What number does this code print?
   let a = 5;
   let b = 1;
   console.log(a + b);
6. 6.⚡ What number does this code print?
   let a = 9;
   let b = 4;
   console.log(a * b);
7. 7.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, Zoya! (d) Well done, name!
8. 8.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
9. 9.⚡ What number does this code print?
   let a = 55;
   let b = 36;
   console.log(a + b);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) let (d) alert()
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
12. 12.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) if (d) let
13. 13.⚡ What number does this code print?
    let a = 14;
    let b = 7;
    console.log(a - b);
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Welcome, name! (d) Kabir
15. 15.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) let (d) for
16. 16.⚡ What number does this code print?
    let books = 7;
    books = books + 17;
    books = books - 4;
    console.log(books);
17. 17.⚡ What number does this code print?
    let a = 47;
    let b = 33;
    console.log(a + b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 21 (c) 3
19. 19.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Zoya! (c) Zoya (d) Hi, name!
20. 20.⚡ What number does this code print?
    let a = 25;
    let b = 11;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let score = 28;
    score = score + 7;
    score = score - 6;
    console.log(score);
22. 22.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 15;
    apples = apples - 34;
    console.log(apples);
23. 23.⚡ What number does this code print?
    let runs = 15;
    runs = runs + 19;
    runs = runs - 21;
    console.log(runs);
24. 24.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 17;
    coins = coins - 11;
    console.log(coins);
25. 25.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let score = 28;
    score = score + 16;
    score = score - 19;
    console.log(score);
27. 27.⚡ What number does this code print?
    let score = 8;
    score = score + 9;
    score = score - 11;
    console.log(score);
28. 28.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) for (d) console.log()
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) 73 (c) Error
30. 30.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) name (d) Hello, Kabir!
31. 31.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) Hello, name! (d) name
32. 32.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) let
33. 33.⚡ What number does this code print?
    let score = 24;
    score = score + 7;
    score = score - 27;
    console.log(score);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) Error (c) 58
35. 35.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 5;
    apples = apples - 11;
    console.log(apples);
36. 36.⚡ What number does this code print?
    let a = 50;
    let b = 7;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let marks = 20;
    marks = marks + 10;
    marks = marks - 8;
    console.log(marks);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 86 (b) 14 (c) Error
39. 39.⚡ What number does this code print?
    let a = 11;
    let b = 5;
    console.log(a - b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 27 (b) Error (c) 9

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