JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 111 · 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 number does this code print?
   let books = 7;
   books = books + 4;
   books = books - 11;
   console.log(books);
2. 2.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) for (d) console.log()
3. 3.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) for
5. 5.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) if (d) let
6. 6.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
7. 7.⚡ What number does this code print?
   let a = 8;
   let b = 8;
   console.log(a * b);
8. 8.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) if (d) for
9. 9.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) name (d) Hi, Kabir!
10. 10.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, name! (d) Hi, Meera!
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 22 (c) 4
12. 12.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) Hi, Aman! (d) name
13. 13.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) name (d) Welcome, Arjun!
14. 14.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 10;
    coins = coins - 14;
    console.log(coins);
15. 15.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) name (d) Kabir
16. 16.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
17. 17.⚡ What number does this code print?
    let a = 54;
    let b = 35;
    console.log(a - b);
18. 18.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 20;
    marks = marks - 7;
    console.log(marks);
19. 19.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 8 (b) Error (c) 26
21. 21.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 20;
    coins = coins - 32;
    console.log(coins);
22. 22.⚡ What number does this code print?
    let a = 35;
    let b = 16;
    console.log(a + b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 41 (c) 5
24. 24.⚡ 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
25. 25.⚡ What number does this code print?
    let a = 58;
    let b = 16;
    console.log(a - b);
26. 26.⚡ What number does this code print?
    let a = 12;
    let b = 5;
    console.log(a - b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 5 (b) Error (c) 23
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 7 (b) Error (c) 16
29. 29.⚡ What number does this code print?
    let a = 27;
    let b = 10;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 3;
    let b = 11;
    console.log(a * b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) Error (b) 85 (c) 13
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 9 (c) 72
33. 33.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
34. 34.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
35. 35.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Kabir (c) Welcome, Kabir! (d) Welcome, name!
36. 36.⚡ What number does this code print?
    let books = 13;
    books = books + 8;
    books = books - 20;
    console.log(books);
37. 37.⚡ 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
38. 38.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, name! (d) Well done, Kabir!
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 91 (c) 10
40. 40.⚡ What number does this code print?
    let score = 22;
    score = score + 7;
    score = score - 24;
    console.log(score);

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