JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 140 · 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.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) if (d) alert()
2. 2.⚡ What number does this code print?
   let a = 18;
   let b = 9;
   console.log(a + b);
3. 3.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
4. 4.⚡ What does this code show?
   let name = "Meera";
   console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Welcome, name! (c) name (d) Meera
5. 5.⚡ What number does this code print?
   let a = 7;
   let b = 10;
   console.log(a * b);
6. 6.⚡ What number does this code print?
   let a = 2;
   let b = 2;
   console.log(a * b);
7. 7.⚡ What number does this code print?
   let a = 54;
   let b = 27;
   console.log(a + b);
8. 8.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) for (d) let
9. 9.⚡ What number does this code print?
   let a = 4;
   let b = 5;
   console.log(a * b);
10. 10.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) if (d) alert()
11. 11.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 3;
    coins = coins - 2;
    console.log(coins);
12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Kabir (d) Hi, Kabir!
13. 13.⚡ What number does this code print?
    let books = 28;
    books = books + 16;
    books = books - 28;
    console.log(books);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) 13 (c) Error
15. 15.⚡ What number does this code print?
    let a = 47;
    let b = 31;
    console.log(a + b);
16. 16.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, Arjun! (b) Hi, name! (c) Arjun (d) name
17. 17.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
18. 18.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 11;
    coins = coins - 2;
    console.log(coins);
19. 19.⚡ What number does this code print?
    let a = 24;
    let b = 33;
    console.log(a + b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 4 (b) Error (c) 22
21. 21.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) let (d) console.log()
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 41 (b) 5 (c) Error
23. 23.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
24. 24.⚡ What number does this code print?
    let a = 37;
    let b = 36;
    console.log(a + b);
25. 25.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
26. 26.⚡ What number does this code print?
    let books = 14;
    books = books + 12;
    books = books - 21;
    console.log(books);
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Arjun (c) name (d) Hello, Arjun!
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Aman (c) name (d) Hi, name!
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 53 (b) Error (c) 8
30. 30.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 6;
    runs = runs - 1;
    console.log(runs);
31. 31.⚡ What number does this code print?
    let a = 5;
    let b = 23;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let a = 12;
    let b = 4;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 3;
    runs = runs - 5;
    console.log(runs);
34. 34.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Arjun (d) Welcome, Arjun!
35. 35.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
36. 36.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) let (d) console.log()
37. 37.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Aman (d) Welcome, Aman!
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) Error (c) 49
39. 39.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 4;
    marks = marks - 9;
    console.log(marks);
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) Riya (d) name

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