JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 707 · 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 a = 32;
   let b = 8;
   console.log(a - b);
2. 2.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
3. 3.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) Welcome, Aman! (d) name
4. 4.⚡ What number does this code print?
   let coins = 12;
   coins = coins + 6;
   coins = coins - 11;
   console.log(coins);
5. 5.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) if (d) for
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
7. 7.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, name! (d) Well done, Zoya!
8. 8.⚡ What number does this code print?
   let a = 20;
   let b = 17;
   console.log(a + b);
9. 9.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
10. 10.⚡ What number does this code print?
    let a = 13;
    let b = 21;
    console.log(a + b);
11. 11.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
12. 12.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) for (d) console.log()
13. 13.⚡ 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
14. 14.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, Riya! (d) Hi, name!
15. 15.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 19;
    marks = marks - 14;
    console.log(marks);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) Error (c) 64
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, name! (d) Hello, Kabir!
18. 18.⚡ What number does this code print?
    let a = 54;
    let b = 16;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 40;
    let b = 29;
    console.log(a - b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 39 (b) 12 (c) Error
21. 21.⚡ What number does this code print?
    let a = 32;
    let b = 21;
    console.log(a - b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) Error (c) 81
23. 23.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) name (c) Well done, name! (d) Well done, Meera!
24. 24.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 17;
    coins = coins - 16;
    console.log(coins);
25. 25.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 6;
    apples = apples - 11;
    console.log(apples);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) Error (b) 71 (c) 8
27. 27.⚡ What number does this code print?
    let a = 12;
    let b = 10;
    console.log(a * b);
28. 28.⚡ 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
29. 29.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) Hi, Kabir! (d) name
30. 30.⚡ What number does this code print?
    let a = 50;
    let b = 12;
    console.log(a + b);
31. 31.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Kabir (c) Welcome, name! (d) Welcome, Kabir!
32. 32.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) Error (b) 11 (c) 38
34. 34.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) console.log() (d) let
35. 35.⚡ What number does this code print?
    let a = 41;
    let b = 37;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 55;
    let b = 32;
    console.log(a + b);
37. 37.⚡ 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
38. 38.⚡ What number does this code print?
    let a = 19;
    let b = 40;
    console.log(a + b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 5 (c) 32
40. 40.⚡ 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!

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