JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 173 · 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";
   console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Hello, name! (d) Riya
2. 2.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) alert() (d) for
3. 3.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Kabir (d) Welcome, name!
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 8;
   console.log(x + y); (a) Error (b) 9 (c) 18
5. 5.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) console.log() (d) let
6. 6.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, name! (d) Hello, Aman!
7. 7.⚡ What number does this code print?
   let a = 10;
   let b = 6;
   console.log(a * b);
8. 8.⚡ What number does this code print?
   let a = 11;
   let b = 12;
   console.log(a * b);
9. 9.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) for (d) console.log()
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) Error (c) 58
11. 11.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) 73 (c) Error
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 10 (b) 82 (c) Error
15. 15.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) for (d) let
16. 16.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) for
17. 17.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) Well done, name! (c) Aman (d) name
18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) Riya (d) name
19. 19.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
20. 20.⚡ What number does this code print?
    let books = 23;
    books = books + 3;
    books = books - 25;
    console.log(books);
21. 21.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 37;
    let b = 6;
    console.log(a - b);
23. 23.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
24. 24.⚡ What number does this code print?
    let books = 14;
    books = books + 16;
    books = books - 22;
    console.log(books);
25. 25.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Welcome, name! (c) Arjun (d) name
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 10 (c) 91
27. 27.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
28. 28.⚡ What number does this code print?
    let a = 6;
    let b = 10;
    console.log(a + b);
29. 29.⚡ What number does this code print?
    let a = 26;
    let b = 16;
    console.log(a - b);
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .html (d) .jpg
31. 31.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) Error (c) 3
33. 33.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 9;
    coins = coins - 20;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let books = 20;
    books = books + 2;
    books = books - 9;
    console.log(books);
35. 35.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Meera (c) name (d) Well done, Meera!
36. 36.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
37. 37.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, name! (d) Welcome, Riya!
38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Meera (d) Welcome, name!
39. 39.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let a = 20;
    let b = 30;
    console.log(a + b);

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