JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 163 · 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 = 60;
   let b = 8;
   console.log(a + b);
2. 2.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 6;
   console.log(x + y); (a) Error (b) 56 (c) 11
4. 4.⚡ What number does this code print?
   let a = 49;
   let b = 18;
   console.log(a + b);
5. 5.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Zoya (d) Hello, Zoya!
6. 6.⚡ What number does this code print?
   let a = 6;
   let b = 9;
   console.log(a * b);
7. 7.⚡ What number does this code print?
   let a = 35;
   let b = 39;
   console.log(a + b);
8. 8.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
9. 9.⚡ What number does this code print?
   let apples = 24;
   apples = apples + 14;
   apples = apples - 37;
   console.log(apples);
10. 10.⚡ What number does this code print?
    let a = 54;
    let b = 25;
    console.log(a - b);
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) let
12. 12.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
13. 13.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) name (d) Riya
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 5 (b) 14 (c) Error
15. 15.⚡ What number does this code print?
    let a = 17;
    let b = 34;
    console.log(a + b);
16. 16.⚡ What number does this code print?
    let a = 40;
    let b = 19;
    console.log(a - b);
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Kabir (d) Hi, Kabir!
18. 18.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
19. 19.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
20. 20.⚡ What number does this code print?
    let a = 19;
    let b = 13;
    console.log(a + b);
21. 21.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Riya (d) Hello, Riya!
22. 22.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) alert()
23. 23.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let a = 5;
    let b = 11;
    console.log(a * b);
25. 25.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) alert() (d) if
26. 26.⚡ What number does this code print?
    let a = 26;
    let b = 10;
    console.log(a + b);
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) Hi, Arjun! (d) name
28. 28.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
29. 29.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) alert()
30. 30.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 9;
    coins = coins - 19;
    console.log(coins);
31. 31.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 15;
    apples = apples - 4;
    console.log(apples);
32. 32.⚡ What number does this code print?
    let a = 10;
    let b = 10;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let a = 54;
    let b = 23;
    console.log(a + b);
34. 34.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, name! (d) Hi, Zoya!
35. 35.⚡ What number does this code print?
    let a = 60;
    let b = 14;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 12;
    apples = apples - 11;
    console.log(apples);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) Error (b) 7 (c) 25
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) 64 (c) Error
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Meera (d) Welcome, Meera!
40. 40.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) name (d) Kabir

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