JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 794 · 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";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Aman (d) Well done, Aman!
2. 2.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) console.log() (d) for
3. 3.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
5. 5.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) alert() (d) if
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 2;
   console.log(x + y); (a) Error (b) 12 (c) 3
7. 7.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
8. 8.⚡ What number does this code print?
   let coins = 28;
   coins = coins + 6;
   coins = coins - 24;
   console.log(coins);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 7;
   console.log(x + y); (a) Error (b) 17 (c) 8
10. 10.⚡ What number does this code print?
    let a = 2;
    let b = 11;
    console.log(a * b);
11. 11.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) let (d) if
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) Error (b) 9 (c) 54
13. 13.⚡ What number does this code print?
    let a = 11;
    let b = 30;
    console.log(a + b);
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) if (d) alert()
15. 15.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
16. 16.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 9;
    marks = marks - 13;
    console.log(marks);
17. 17.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) let (d) alert()
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Riya (d) Welcome, Riya!
19. 19.⚡ What number does this code print?
    let a = 13;
    let b = 12;
    console.log(a - b);
20. 20.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) Error (c) 18
22. 22.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 12 (b) Error (c) 57
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) 44 (c) Error
25. 25.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, Kabir! (d) Hello, name!
26. 26.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Arjun! (c) name (d) Arjun
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) Error (b) 10 (c) 55
28. 28.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, Meera! (d) Hi, name!
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 17 (b) Error (c) 98
30. 30.⚡ What number does this code print?
    let books = 24;
    books = books + 10;
    books = books - 29;
    console.log(books);
31. 31.⚡ What number does this code print?
    let a = 60;
    let b = 15;
    console.log(a + b);
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) Riya (d) name
33. 33.⚡ What number does this code print?
    let books = 21;
    books = books + 13;
    books = books - 20;
    console.log(books);
34. 34.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, Riya! (d) Hello, name!
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 10 (b) 91 (c) Error
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
37. 37.⚡ What number does this code print?
    let a = 4;
    let b = 3;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 6;
    coins = coins - 35;
    console.log(coins);
39. 39.⚡ What number does this code print?
    let score = 22;
    score = score + 5;
    score = score - 15;
    console.log(score);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 9 (b) 45 (c) Error

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