JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 704 · 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 print? (Look at the quotes!)
   let x = "8";
   let y = 4;
   console.log(x + y); (a) 84 (b) 12 (c) Error
2. 2.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) let
3. 3.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) Meera (b) Hi, name! (c) Hi, Meera! (d) name
4. 4.⚡ What number does this code print?
   let a = 10;
   let b = 27;
   console.log(a + b);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 2;
   console.log(x + y); (a) Error (b) 8 (c) 62
6. 6.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 8;
   console.log(x + y); (a) Error (b) 58 (c) 13
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 9;
   console.log(x + y); (a) 99 (b) Error (c) 18
9. 9.⚡ What number does this code print?
   let marks = 22;
   marks = marks + 14;
   marks = marks - 8;
   console.log(marks);
10. 10.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) let (d) console.log()
12. 12.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
13. 13.⚡ 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
14. 14.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) for (d) let
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 94 (b) Error (c) 13
16. 16.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
17. 17.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) Error (b) 63 (c) 9
19. 19.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
20. 20.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 20;
    runs = runs - 41;
    console.log(runs);
21. 21.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, name! (d) Hello, Arjun!
22. 22.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
23. 23.⚡ What number does this code print?
    let a = 51;
    let b = 13;
    console.log(a - b);
24. 24.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
25. 25.⚡ What number does this code print?
    let books = 21;
    books = books + 13;
    books = books - 20;
    console.log(books);
26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) Hello, Kabir! (c) Hello, name! (d) name
27. 27.⚡ What number does this code print?
    let a = 25;
    let b = 16;
    console.log(a - b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 56 (c) 11
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 12 (b) 39 (c) Error
30. 30.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Welcome, name! (c) Meera (d) name
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 12 (b) 93 (c) Error
32. 32.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Riya! (c) Well done, name! (d) Riya
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) Error (c) 77
34. 34.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
35. 35.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Aman (d) Hi, Aman!
36. 36.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 15;
    coins = coins - 43;
    console.log(coins);
37. 37.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
38. 38.⚡ What number does this code print?
    let a = 57;
    let b = 10;
    console.log(a + b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) Error (c) 85
40. 40.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) console.log() (d) alert()

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