JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 56 · 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 does this code print? (Look at the quotes!)
   let x = "3";
   let y = 7;
   console.log(x + y); (a) Error (b) 10 (c) 37
2. 2.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) Arjun (b) Hi, name! (c) name (d) Hi, Arjun!
3. 3.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) console.log()
4. 4.⚡ What number does this code print?
   let coins = 29;
   coins = coins + 18;
   coins = coins - 31;
   console.log(coins);
5. 5.⚡ What number does this code print?
   let score = 6;
   score = score + 10;
   score = score - 10;
   console.log(score);
6. 6.⚡ What does this code show?
   let name = "Meera";
   console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) Well done, name! (c) Meera (d) name
7. 7.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Riya (b) Well done, Riya! (c) Well done, name! (d) name
8. 8.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Aman (b) name (c) Welcome, name! (d) Welcome, Aman!
9. 9.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) if (d) let
10. 10.⚡ What number does this code print?
    let a = 59;
    let b = 40;
    console.log(a - b);
11. 11.⚡ What number does this code print?
    let a = 44;
    let b = 23;
    console.log(a + b);
12. 12.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
14. 14.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) Well done, name! (c) Kabir (d) name
15. 15.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let a = 60;
    let b = 29;
    console.log(a - b);
17. 17.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) console.log() (d) let
18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!
19. 19.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Meera! (d) Meera
20. 20.⚡ What number does this code print?
    let a = 23;
    let b = 8;
    console.log(a - b);
21. 21.⚡ What number does this code print?
    let a = 48;
    let b = 27;
    console.log(a + b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 12 (b) Error (c) 39
23. 23.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, Kabir! (b) Kabir (c) Hi, name! (d) name
24. 24.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) console.log() (d) if
25. 25.⚡ What number does this code print?
    let score = 5;
    score = score + 9;
    score = score - 5;
    console.log(score);
26. 26.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 20;
    apples = apples - 19;
    console.log(apples);
27. 27.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) alert() (d) if
28. 28.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
29. 29.⚡ What number does this code print?
    let a = 32;
    let b = 32;
    console.log(a + b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 32 (c) 5
31. 31.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
32. 32.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 20;
    apples = apples - 6;
    console.log(apples);
33. 33.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) Zoya (c) Hi, name! (d) name
34. 34.⚡ What number does this code print?
    let books = 27;
    books = books + 12;
    books = books - 2;
    console.log(books);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) 79 (b) 16 (c) Error
36. 36.⚡ What number does this code print?
    let score = 9;
    score = score + 13;
    score = score - 9;
    console.log(score);
37. 37.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) Hi, name! (d) name
39. 39.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 11;
    coins = coins - 12;
    console.log(coins);
40. 40.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 13;
    apples = apples - 32;
    console.log(apples);

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