JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 553 · 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 tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
2. 2.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) if
3. 3.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) console.log() (d) alert()
4. 4.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, name! (d) Hello, Arjun!
5. 5.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
6. 6.⚡ What number does this code print?
   let a = 23;
   let b = 22;
   console.log(a + b);
7. 7.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) name (d) Aman
8. 8.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, name! (d) Hi, Meera!
9. 9.⚡ What number does this code print?
   let score = 20;
   score = score + 15;
   score = score - 10;
   console.log(score);
10. 10.⚡ What number does this code print?
    let a = 18;
    let b = 40;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let a = 31;
    let b = 31;
    console.log(a - b);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) Error (b) 38 (c) 11
13. 13.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Kabir! (d) Kabir
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 14 (b) Error (c) 86
15. 15.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 13;
    marks = marks - 17;
    console.log(marks);
16. 16.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 16;
    coins = coins - 4;
    console.log(coins);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 10 (b) 19 (c) Error
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) Error (b) 71 (c) 8
19. 19.⚡ What number does this code print?
    let score = 28;
    score = score + 2;
    score = score - 17;
    console.log(score);
20. 20.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
21. 21.⚡ What number does this code print?
    let a = 5;
    let b = 7;
    console.log(a * b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) Error (b) 3 (c) 12
23. 23.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
24. 24.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 15;
    apples = apples - 13;
    console.log(apples);
25. 25.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
26. 26.⚡ What number does this code print?
    let books = 27;
    books = books + 7;
    books = books - 30;
    console.log(books);
27. 27.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 16;
    apples = apples - 5;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let books = 12;
    books = books + 13;
    books = books - 3;
    console.log(books);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 68 (b) Error (c) 14
30. 30.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Hello, name! (d) Riya
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) Error (c) 41
32. 32.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Riya (d) Well done, Riya!
33. 33.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) let
34. 34.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) let
35. 35.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) name (d) Hi, Kabir!
36. 36.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) console.log() (d) for
37. 37.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let books = 10;
    books = books + 2;
    books = books - 8;
    console.log(books);
39. 39.⚡ What number does this code print?
    let a = 29;
    let b = 25;
    console.log(a + b);
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Riya (d) Hi, name!

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