JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 649 · 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.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) for (d) let
2. 2.⚡ What number does this code print?
   let a = 20;
   let b = 37;
   console.log(a + b);
3. 3.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, Aman! (c) Welcome, name! (d) Aman
4. 4.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
5. 5.⚡ What number does this code print?
   let books = 7;
   books = books + 11;
   books = books - 9;
   console.log(books);
6. 6.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) if (d) for
7. 7.⚡ What number does this code print?
   let a = 51;
   let b = 29;
   console.log(a + b);
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) console.log() (d) alert()
9. 9.⚡ What number does this code print?
   let score = 12;
   score = score + 15;
   score = score - 8;
   console.log(score);
10. 10.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 5;
    marks = marks - 24;
    console.log(marks);
11. 11.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
12. 12.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Riya (c) name (d) Welcome, Riya!
13. 13.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) name (d) Hello, name!
14. 14.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 14 (c) 95
16. 16.⚡ What number does this code print?
    let a = 25;
    let b = 10;
    console.log(a + b);
17. 17.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
18. 18.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) let
19. 19.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a + b);
20. 20.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
21. 21.⚡ What number does this code print?
    let books = 8;
    books = books + 12;
    books = books - 5;
    console.log(books);
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Riya (c) Hello, name! (d) name
23. 23.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) name (d) Hello, name!
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 44 (c) 8
25. 25.⚡ What number does this code print?
    let score = 16;
    score = score + 8;
    score = score - 4;
    console.log(score);
26. 26.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 7;
    marks = marks - 19;
    console.log(marks);
27. 27.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 3;
    apples = apples - 2;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let books = 16;
    books = books + 3;
    books = books - 4;
    console.log(books);
29. 29.⚡ What number does this code print?
    let a = 42;
    let b = 10;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let score = 18;
    score = score + 18;
    score = score - 36;
    console.log(score);
31. 31.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a - b);
32. 32.⚡ What number does this code print?
    let a = 19;
    let b = 23;
    console.log(a + b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) Error (b) 14 (c) 86
34. 34.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let a = 12;
    let b = 21;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let books = 19;
    books = books + 8;
    books = books - 19;
    console.log(books);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 69 (b) Error (c) 15
38. 38.⚡ What number does this code print?
    let a = 32;
    let b = 8;
    console.log(a - b);
39. 39.⚡ 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
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) 8 (c) Error

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