JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 893 · 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 writes in the console? (a) console.log() (b) for (c) alert() (d) let
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .js (d) .html
3. 3.⚡ What number does this code print?
   let score = 9;
   score = score + 5;
   score = score - 3;
   console.log(score);
4. 4.⚡ What number does this code print?
   let a = 32;
   let b = 10;
   console.log(a + b);
5. 5.⚡ What number does this code print?
   let a = 40;
   let b = 27;
   console.log(a - b);
6. 6.⚡ 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
7. 7.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 1;
   console.log(x + y); (a) Error (b) 31 (c) 4
9. 9.⚡ What number does this code print?
   let marks = 21;
   marks = marks + 3;
   marks = marks - 2;
   console.log(marks);
10. 10.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 15;
    runs = runs - 8;
    console.log(runs);
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) Hello, Riya! (d) name
12. 12.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Aman! (c) Aman (d) Welcome, name!
13. 13.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a * b);
14. 14.⚡ What number does this code print?
    let score = 22;
    score = score + 18;
    score = score - 8;
    console.log(score);
15. 15.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) alert() (d) if
16. 16.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) name (d) Hi, name!
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) name (c) Riya (d) Welcome, name!
18. 18.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) for (d) if
19. 19.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
20. 20.⚡ What number does this code print?
    let a = 29;
    let b = 2;
    console.log(a + b);
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) console.log()
22. 22.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) 8 (c) Error
24. 24.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) console.log() (d) for
25. 25.⚡ What number does this code print?
    let a = 11;
    let b = 20;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 52;
    let b = 16;
    console.log(a - b);
27. 27.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) name (c) Hi, name! (d) Zoya
28. 28.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Aman (d) Welcome, Aman!
30. 30.⚡ What number does this code print?
    let a = 45;
    let b = 24;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 16;
    marks = marks - 22;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let a = 18;
    let b = 18;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let a = 39;
    let b = 20;
    console.log(a - b);
34. 34.⚡ 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
35. 35.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
36. 36.⚡ What number does this code print?
    let books = 21;
    books = books + 8;
    books = books - 19;
    console.log(books);
37. 37.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Arjun (c) name (d) Hello, Arjun!
38. 38.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 5;
    coins = coins - 21;
    console.log(coins);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 13 (c) 49
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 13 (b) Error (c) 94

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