JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 535 · 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 = 10;
   let b = 2;
   console.log(a * b);
2. 2.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) console.log() (d) let
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 5;
   console.log(x + y); (a) Error (b) 45 (c) 9
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) for
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Kabir! (d) Kabir
6. 6.⚡ What number does this code print?
   let a = 51;
   let b = 28;
   console.log(a + b);
7. 7.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) name (d) Hi, Aman!
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 9;
   console.log(x + y); (a) Error (b) 99 (c) 18
9. 9.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
10. 10.⚡ What number does this code print?
    let a = 19;
    let b = 9;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 8 (b) Error (c) 71
13. 13.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) name (d) Well done, Riya!
14. 14.⚡ What number does this code print?
    let a = 31;
    let b = 25;
    console.log(a + b);
15. 15.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
16. 16.⚡ What number does this code print?
    let score = 24;
    score = score + 8;
    score = score - 20;
    console.log(score);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 73 (b) Error (c) 10
18. 18.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) for (d) console.log()
19. 19.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
20. 20.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Zoya (d) Hi, Zoya!
21. 21.⚡ What number does this code print?
    let a = 3;
    let b = 5;
    console.log(a * b);
22. 22.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Well done, name! (d) Kabir
23. 23.⚡ What number does this code print?
    let a = 28;
    let b = 6;
    console.log(a - b);
24. 24.⚡ 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
25. 25.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 4;
    apples = apples - 8;
    console.log(apples);
26. 26.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) alert() (d) let
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Well done, name! (d) Arjun
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) name (d) Welcome, Zoya!
29. 29.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) Hello, name! (c) Arjun (d) name
30. 30.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
31. 31.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) Hello, name! (d) name
32. 32.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
33. 33.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 4;
    apples = apples - 6;
    console.log(apples);
34. 34.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) if (d) console.log()
35. 35.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) Error (c) 12
37. 37.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 4;
    runs = runs - 5;
    console.log(runs);
38. 38.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) name (c) Zoya (d) Hello, name!
39. 39.⚡ What number does this code print?
    let a = 28;
    let b = 3;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a * b);

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