JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 382 · 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.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
2. 2.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) for (d) if
3. 3.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
4. 4.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 7;
   console.log(x + y); (a) 14 (b) 77 (c) Error
6. 6.⚡ What number does this code print?
   let a = 13;
   let b = 11;
   console.log(a - b);
7. 7.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) let (d) if
8. 8.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) for (d) alert()
9. 9.⚡ What number does this code print?
   let apples = 11;
   apples = apples + 7;
   apples = apples - 4;
   console.log(apples);
10. 10.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 17;
    runs = runs - 3;
    console.log(runs);
11. 11.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 10;
    apples = apples - 17;
    console.log(apples);
12. 12.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) alert() (d) if
13. 13.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) name (c) Kabir (d) Welcome, name!
14. 14.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) alert() (d) console.log()
16. 16.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, Aman! (d) Well done, name!
17. 17.⚡ What number does this code print?
    let a = 8;
    let b = 3;
    console.log(a * b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) Error (c) 3
19. 19.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Arjun! (c) Arjun (d) Welcome, name!
20. 20.⚡ What number does this code print?
    let books = 17;
    books = books + 20;
    books = books - 13;
    console.log(books);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) Error (b) 10 (c) 73
22. 22.⚡ What number does this code print?
    let a = 12;
    let b = 7;
    console.log(a * b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) Error (b) 68 (c) 14
24. 24.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 4;
    runs = runs - 12;
    console.log(runs);
25. 25.⚡ What number does this code print?
    let a = 3;
    let b = 12;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let a = 58;
    let b = 28;
    console.log(a + b);
27. 27.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) name (c) Zoya (d) Well done, name!
28. 28.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
29. 29.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 12;
    apples = apples - 2;
    console.log(apples);
30. 30.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) Riya (d) name
31. 31.⚡ What number does this code print?
    let a = 55;
    let b = 20;
    console.log(a - b);
32. 32.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) Well done, Aman! (d) name
33. 33.⚡ What number does this code print?
    let a = 38;
    let b = 16;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 5;
    apples = apples - 29;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 16;
    apples = apples - 2;
    console.log(apples);
36. 36.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 85 (b) 13 (c) Error
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 10 (b) Error (c) 91
39. 39.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Kabir! (d) Kabir
40. 40.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 7;
    marks = marks - 11;
    console.log(marks);

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