JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 345 · 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 = "Aman";
   alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
2. 2.⚡ What number does this code print?
   let a = 53;
   let b = 10;
   console.log(a + b);
3. 3.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
4. 4.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) console.log()
5. 5.⚡ What number does this code print?
   let score = 25;
   score = score + 14;
   score = score - 36;
   console.log(score);
6. 6.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
7. 7.⚡ What number does this code print?
   let a = 11;
   let b = 7;
   console.log(a - b);
8. 8.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
9. 9.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 26 (b) 8 (c) Error
11. 11.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) alert() (d) let
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) console.log() (d) alert()
13. 13.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 16;
    marks = marks - 14;
    console.log(marks);
14. 14.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Arjun! (c) Arjun (d) name
15. 15.⚡ What number does this code print?
    let books = 26;
    books = books + 6;
    books = books - 8;
    console.log(books);
16. 16.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) let (d) alert()
17. 17.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 7;
    marks = marks - 16;
    console.log(marks);
18. 18.⚡ What number does this code print?
    let a = 10;
    let b = 8;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 14;
    let b = 35;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 21;
    let b = 18;
    console.log(a - b);
21. 21.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Meera (d) Hi, Meera!
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 7 (b) 61 (c) Error
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) 52 (c) Error
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) Error (b) 11 (c) 38
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Riya (d) Hello, name!
26. 26.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Meera (c) name (d) Well done, Meera!
27. 27.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 8;
    marks = marks - 1;
    console.log(marks);
28. 28.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Hello, name! (d) Meera
29. 29.⚡ What number does this code print?
    let a = 32;
    let b = 29;
    console.log(a + b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 14 (c) 5
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) Error (c) 67
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) Error (b) 11 (c) 65
33. 33.⚡ What number does this code print?
    let a = 27;
    let b = 3;
    console.log(a + b);
34. 34.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) Well done, name! (c) Zoya (d) name
35. 35.⚡ What number does this code print?
    let a = 52;
    let b = 1;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 9;
    marks = marks - 3;
    console.log(marks);
37. 37.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) for (d) console.log()
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 4 (c) 13
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) Error (b) 62 (c) 8
40. 40.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) name (d) Well done, Aman!

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