JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 846 · 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 = "Kabir";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, Kabir! (c) Kabir (d) Hi, name!
2. 2.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) name (d) Riya
3. 3.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) console.log() (d) if
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) for
5. 5.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) if (d) for
6. 6.⚡ What number does this code print?
   let a = 10;
   let b = 9;
   console.log(a * b);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 2;
   console.log(x + y); (a) Error (b) 8 (c) 62
8. 8.⚡ What number does this code print?
   let books = 21;
   books = books + 14;
   books = books - 17;
   console.log(books);
9. 9.⚡ What number does this code print?
   let books = 28;
   books = books + 3;
   books = books - 2;
   console.log(books);
10. 10.⚡ What number does this code print?
    let a = 40;
    let b = 4;
    console.log(a + b);
11. 11.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
12. 12.⚡ What number does this code print?
    let a = 37;
    let b = 8;
    console.log(a - b);
13. 13.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
14. 14.⚡ What number does this code print?
    let a = 47;
    let b = 23;
    console.log(a - b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 99 (b) 18 (c) Error
16. 16.⚡ What number does this code print?
    let a = 20;
    let b = 19;
    console.log(a - b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 12 (b) 93 (c) Error
18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Riya! (d) Riya
19. 19.⚡ What number does this code print?
    let a = 19;
    let b = 18;
    console.log(a - b);
20. 20.⚡ What number does this code print?
    let books = 21;
    books = books + 11;
    books = books - 21;
    console.log(books);
21. 21.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 9;
    marks = marks - 5;
    console.log(marks);
22. 22.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
23. 23.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 16;
    runs = runs - 12;
    console.log(runs);
24. 24.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
25. 25.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
26. 26.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) alert() (d) if
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) name (d) Welcome, Riya!
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) 83 (c) Error
29. 29.⚡ 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
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) 31 (c) Error
31. 31.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) name (c) Welcome, name! (d) Aman
32. 32.⚡ What number does this code print?
    let a = 46;
    let b = 19;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let a = 9;
    let b = 12;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, Arjun! (b) Arjun (c) Hi, name! (d) name
35. 35.⚡ What number does this code print?
    let a = 38;
    let b = 26;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 2;
    coins = coins - 11;
    console.log(coins);
37. 37.⚡ What number does this code print?
    let a = 46;
    let b = 1;
    console.log(a + b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 29 (b) 11 (c) Error
39. 39.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, Aman! (d) Welcome, name!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 48 (b) 12 (c) Error

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