JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 475 · 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 alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) if (d) let
3. 3.⚡ What number does this code print?
   let a = 59;
   let b = 28;
   console.log(a + b);
4. 4.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) alert() (d) for
5. 5.⚡ What number does this code print?
   let runs = 8;
   runs = runs + 4;
   runs = runs - 3;
   console.log(runs);
6. 6.⚡ What number does this code print?
   let score = 18;
   score = score + 9;
   score = score - 1;
   console.log(score);
7. 7.⚡ What number does this code print?
   let a = 35;
   let b = 26;
   console.log(a + b);
8. 8.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
9. 9.⚡ What number does this code print?
   let a = 36;
   let b = 5;
   console.log(a + b);
10. 10.⚡ What number does this code print?
    let a = 38;
    let b = 13;
    console.log(a - b);
11. 11.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) if (d) let
12. 12.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) alert() (d) let
13. 13.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) name (d) Riya
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) Well done, name! (c) name (d) Kabir
15. 15.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
16. 16.⚡ What number does this code print?
    let a = 38;
    let b = 28;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let a = 36;
    let b = 9;
    console.log(a + b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) Error (c) 43
19. 19.⚡ 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
20. 20.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Aman (d) Hello, name!
21. 21.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) alert() (d) let
22. 22.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 2;
    runs = runs - 7;
    console.log(runs);
23. 23.⚡ What number does this code print?
    let score = 11;
    score = score + 12;
    score = score - 18;
    console.log(score);
24. 24.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
25. 25.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Aman! (d) Aman
26. 26.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) name (d) Riya
28. 28.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
29. 29.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, Arjun! (b) Hi, name! (c) Arjun (d) name
30. 30.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) name (d) Hi, Zoya!
31. 31.⚡ What number does this code print?
    let a = 21;
    let b = 18;
    console.log(a - b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 51 (b) 6 (c) Error
33. 33.⚡ What number does this code print?
    let score = 19;
    score = score + 17;
    score = score - 6;
    console.log(score);
34. 34.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) Welcome, Arjun! (d) name
35. 35.⚡ What number does this code print?
    let score = 18;
    score = score + 14;
    score = score - 12;
    console.log(score);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 66 (b) Error (c) 12
37. 37.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, name! (d) Well done, Kabir!
38. 38.⚡ What number does this code print?
    let a = 12;
    let b = 21;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 11;
    apples = apples - 21;
    console.log(apples);
40. 40.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css

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