JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 547 · 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 = 25;
   score = score + 3;
   score = score - 15;
   console.log(score);
2. 2.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
3. 3.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) if (d) console.log()
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 7;
   console.log(x + y); (a) 97 (b) Error (c) 16
5. 5.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) if (d) console.log()
6. 6.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) if (d) let
7. 7.⚡ What number does this code print?
   let a = 2;
   let b = 3;
   console.log(a * b);
8. 8.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) for (d) console.log()
10. 10.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Kabir! (d) Kabir
11. 11.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
12. 12.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 18;
    apples = apples - 21;
    console.log(apples);
13. 13.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 3;
    runs = runs - 13;
    console.log(runs);
14. 14.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) name (d) Riya
15. 15.⚡ What number does this code print?
    let a = 59;
    let b = 10;
    console.log(a + b);
16. 16.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) Error (b) 10 (c) 46
18. 18.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, name! (c) name (d) Hello, Meera!
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) Error (c) 4
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) 9 (c) Error
21. 21.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 33;
    let b = 16;
    console.log(a + b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 44 (c) 8
24. 24.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 16;
    apples = apples - 3;
    console.log(apples);
25. 25.⚡ What number does this code print?
    let score = 23;
    score = score + 17;
    score = score - 14;
    console.log(score);
26. 26.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Arjun! (c) Arjun (d) name
27. 27.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
28. 28.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 7;
    apples = apples - 8;
    console.log(apples);
29. 29.⚡ What number does this code print?
    let a = 10;
    let b = 31;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 46;
    let b = 22;
    console.log(a - b);
31. 31.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) Kabir (d) name
32. 32.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Arjun! (d) Arjun
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 19 (b) Error (c) 10
34. 34.⚡ What number does this code print?
    let books = 16;
    books = books + 9;
    books = books - 14;
    console.log(books);
35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Zoya! (c) Well done, name! (d) Zoya
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) 79 (b) Error (c) 16
37. 37.⚡ What number does this code print?
    let a = 7;
    let b = 10;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 20;
    apples = apples - 18;
    console.log(apples);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 3 (c) 21
40. 40.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 5;
    runs = runs - 24;
    console.log(runs);

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