JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 554 · 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.⚡ 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
2. 2.⚡ What number does this code print?
   let apples = 5;
   apples = apples + 4;
   apples = apples - 2;
   console.log(apples);
3. 3.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) Hello, Aman! (d) name
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 6;
   console.log(x + y); (a) 76 (b) 13 (c) Error
5. 5.⚡ What number does this code print?
   let a = 50;
   let b = 22;
   console.log(a - b);
6. 6.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) for (d) console.log()
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) let (d) alert()
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 9;
   console.log(x + y); (a) Error (b) 16 (c) 79
9. 9.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) for (d) let
10. 10.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) if
11. 11.⚡ 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
12. 12.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Arjun (d) Well done, Arjun!
13. 13.⚡ What number does this code print?
    let a = 20;
    let b = 6;
    console.log(a - b);
14. 14.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
15. 15.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Riya (d) Welcome, Riya!
16. 16.⚡ What number does this code print?
    let books = 23;
    books = books + 2;
    books = books - 9;
    console.log(books);
17. 17.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
18. 18.⚡ What number does this code print?
    let a = 6;
    let b = 32;
    console.log(a + b);
19. 19.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) Error (b) 69 (c) 15
21. 21.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) name (d) Kabir
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) 43 (c) Error
23. 23.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Arjun (c) Hello, Arjun! (d) name
24. 24.⚡ What number does this code print?
    let a = 12;
    let b = 4;
    console.log(a * b);
25. 25.⚡ What number does this code print?
    let a = 57;
    let b = 16;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let score = 6;
    score = score + 5;
    score = score - 2;
    console.log(score);
27. 27.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 9;
    apples = apples - 3;
    console.log(apples);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 49 (b) 13 (c) Error
29. 29.⚡ What number does this code print?
    let a = 12;
    let b = 7;
    console.log(a * b);
30. 30.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) name (d) Riya
31. 31.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) name (c) Arjun (d) Hi, name!
32. 32.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 10;
    runs = runs - 15;
    console.log(runs);
33. 33.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) if (d) let
34. 34.⚡ What number does this code print?
    let a = 40;
    let b = 20;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 9;
    apples = apples - 18;
    console.log(apples);
36. 36.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) name (d) Riya
37. 37.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
38. 38.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 3;
    marks = marks - 9;
    console.log(marks);
39. 39.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Zoya (c) Welcome, name! (d) name
40. 40.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes

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