JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 407 · 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 = "Riya";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Riya (d) Hello, Riya!
2. 2.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) if (d) let
3. 3.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Arjun! (c) name (d) Arjun
4. 4.⚡ What number does this code print?
   let apples = 27;
   apples = apples + 12;
   apples = apples - 23;
   console.log(apples);
5. 5.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) console.log() (d) let
6. 6.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Zoya (d) Well done, Zoya!
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 5;
   console.log(x + y); (a) 14 (b) 95 (c) Error
8. 8.⚡ What does this code show?
   let name = "Kabir";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Kabir (d) Well done, Kabir!
9. 9.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
10. 10.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 11;
    coins = coins - 7;
    console.log(coins);
11. 11.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
12. 12.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, Kabir! (d) Hello, name!
13. 13.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 20;
    marks = marks - 9;
    console.log(marks);
14. 14.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) Hello, name! (c) Meera (d) name
15. 15.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
16. 16.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, name! (d) Hi, Meera!
17. 17.⚡ 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
18. 18.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Arjun! (c) name (d) Arjun
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 9 (b) 27 (c) Error
20. 20.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
21. 21.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 31;
    let b = 20;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 6;
    coins = coins - 13;
    console.log(coins);
24. 24.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a - b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 15 (b) Error (c) 96
26. 26.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) 13 (c) Error
29. 29.⚡ What number does this code print?
    let a = 46;
    let b = 38;
    console.log(a - b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) 9 (c) Error
31. 31.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Zoya (c) Welcome, name! (d) name
32. 32.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) if
33. 33.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
34. 34.⚡ What number does this code print?
    let a = 46;
    let b = 20;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let a = 58;
    let b = 32;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 19;
    let b = 38;
    console.log(a + b);
37. 37.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
38. 38.⚡ What number does this code print?
    let books = 14;
    books = books + 2;
    books = books - 7;
    console.log(books);
39. 39.⚡ What number does this code print?
    let books = 6;
    books = books + 2;
    books = books - 6;
    console.log(books);
40. 40.⚡ What number does this code print?
    let a = 17;
    let b = 5;
    console.log(a - b);

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