JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 753 · 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 = "9";
   let y = 4;
   console.log(x + y); (a) 94 (b) 13 (c) Error
2. 2.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Zoya (d) Hello, Zoya!
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 7;
   console.log(x + y); (a) 13 (b) Error (c) 67
4. 4.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
5. 5.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Aman (d) Welcome, Aman!
6. 6.⚡ What number does this code print?
   let books = 12;
   books = books + 2;
   books = books - 7;
   console.log(books);
7. 7.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 6;
   console.log(x + y); (a) Error (b) 9 (c) 36
9. 9.⚡ What number does this code print?
   let runs = 6;
   runs = runs + 16;
   runs = runs - 9;
   console.log(runs);
10. 10.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) if (d) let
11. 11.⚡ What number does this code print?
    let a = 12;
    let b = 7;
    console.log(a * b);
12. 12.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) if
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) 4 (c) Error
14. 14.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) let (d) if
16. 16.⚡ What number does this code print?
    let a = 33;
    let b = 17;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 16;
    runs = runs - 7;
    console.log(runs);
18. 18.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) name (b) Kabir (c) Well done, name! (d) Well done, Kabir!
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) 46 (c) Error
20. 20.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 17;
    apples = apples - 6;
    console.log(apples);
21. 21.⚡ What number does this code print?
    let a = 57;
    let b = 6;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let a = 6;
    let b = 10;
    console.log(a * b);
23. 23.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
24. 24.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
25. 25.⚡ What number does this code print?
    let a = 2;
    let b = 11;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let books = 30;
    books = books + 16;
    books = books - 16;
    console.log(books);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Kabir (c) Welcome, name! (d) Welcome, Kabir!
28. 28.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 82 (b) Error (c) 10
30. 30.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) Hello, name! (d) name
31. 31.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 5;
    runs = runs - 10;
    console.log(runs);
32. 32.⚡ What number does this code print?
    let books = 25;
    books = books + 17;
    books = books - 10;
    console.log(books);
33. 33.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) let (d) for
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 87 (b) Error (c) 15
35. 35.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 13;
    apples = apples - 1;
    console.log(apples);
36. 36.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 6;
    coins = coins - 14;
    console.log(coins);
37. 37.⚡ What number does this code print?
    let score = 20;
    score = score + 20;
    score = score - 25;
    console.log(score);
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) name (d) Riya
39. 39.⚡ What number does this code print?
    let books = 25;
    books = books + 15;
    books = books - 36;
    console.log(books);
40. 40.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Arjun! (d) Arjun

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