JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 614 · 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 show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, name! (d) Well done, Zoya!
2. 2.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) console.log() (d) let
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) for (d) if
4. 4.⚡ What number does this code print?
   let coins = 10;
   coins = coins + 4;
   coins = coins - 3;
   console.log(coins);
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 score = 28;
   score = score + 12;
   score = score - 10;
   console.log(score);
7. 7.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 4;
   console.log(x + y); (a) 74 (b) 11 (c) Error
9. 9.⚡ What number does this code print?
   let coins = 17;
   coins = coins + 12;
   coins = coins - 8;
   console.log(coins);
10. 10.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Zoya! (c) name (d) Zoya
11. 11.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 16;
    marks = marks - 2;
    console.log(marks);
12. 12.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) Hi, Kabir! (d) name
13. 13.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) name (d) Aman
14. 14.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) alert()
15. 15.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
16. 16.⚡ What number does this code print?
    let a = 7;
    let b = 10;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let a = 14;
    let b = 20;
    console.log(a + b);
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, name! (d) Hi, Aman!
19. 19.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 9;
    coins = coins - 3;
    console.log(coins);
20. 20.⚡ What number does this code print?
    let a = 17;
    let b = 10;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 5;
    marks = marks - 12;
    console.log(marks);
22. 22.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Aman! (c) Aman (d) Well done, name!
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 83 (b) Error (c) 11
24. 24.⚡ What number does this code print?
    let a = 51;
    let b = 7;
    console.log(a - b);
25. 25.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 65 (b) Error (c) 11
27. 27.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Hi, name! (d) Arjun
28. 28.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) let (d) alert()
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 63 (b) Error (c) 9
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 14 (b) 95 (c) Error
31. 31.⚡ 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
32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Meera (c) Well done, name! (d) Well done, Meera!
33. 33.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 5;
    apples = apples - 1;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 19;
    apples = apples - 2;
    console.log(apples);
35. 35.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Zoya! (d) Zoya
36. 36.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
37. 37.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 9;
    marks = marks - 14;
    console.log(marks);
38. 38.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) Welcome, Zoya! (c) Welcome, name! (d) name
39. 39.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) alert()
40. 40.⚡ What number does this code print?
    let a = 4;
    let b = 11;
    console.log(a * b);

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