JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 282 · 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 runs = 22;
   runs = runs + 3;
   runs = runs - 16;
   console.log(runs);
2. 2.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) for (d) let
4. 4.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) name (d) Well done, Riya!
5. 5.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
6. 6.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) let (d) console.log()
7. 7.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) let
8. 8.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
9. 9.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) name (d) Hi, name!
10. 10.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
11. 11.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 13 (b) 94 (c) Error
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 82 (c) 10
14. 14.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) alert() (d) let
15. 15.⚡ What number does this code print?
    let a = 18;
    let b = 1;
    console.log(a + b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 15 (b) Error (c) 69
17. 17.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 19;
    marks = marks - 22;
    console.log(marks);
18. 18.⚡ What number does this code print?
    let a = 41;
    let b = 26;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 13;
    runs = runs - 2;
    console.log(runs);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 66 (b) 12 (c) Error
21. 21.⚡ What number does this code print?
    let a = 20;
    let b = 5;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let a = 3;
    let b = 10;
    console.log(a * b);
23. 23.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
24. 24.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
25. 25.⚡ What number does this code print?
    let a = 59;
    let b = 17;
    console.log(a - b);
26. 26.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Arjun! (c) Arjun (d) name
27. 27.⚡ What number does this code print?
    let a = 51;
    let b = 22;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 11;
    coins = coins - 15;
    console.log(coins);
29. 29.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, name! (d) Hi, Kabir!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) Error (b) 28 (c) 10
31. 31.⚡ What number does this code print?
    let a = 39;
    let b = 19;
    console.log(a - b);
32. 32.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Arjun (d) Welcome, Arjun!
33. 33.⚡ What number does this code print?
    let books = 28;
    books = books + 15;
    books = books - 12;
    console.log(books);
34. 34.⚡ What number does this code print?
    let a = 55;
    let b = 4;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) Error (c) 8
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) Error (b) 16 (c) 7
37. 37.⚡ 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
38. 38.⚡ What number does this code print?
    let a = 31;
    let b = 6;
    console.log(a - b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) Error (b) 7 (c) 52
40. 40.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) Hi, Aman! (d) name

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