JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 122 · 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 print? (Look at the quotes!)
   let x = "1";
   let y = 8;
   console.log(x + y); (a) 9 (b) 18 (c) Error
2. 2.⚡ What number does this code print?
   let books = 19;
   books = books + 15;
   books = books - 16;
   console.log(books);
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) for
4. 4.⚡ What number does this code print?
   let a = 33;
   let b = 7;
   console.log(a - b);
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
6. 6.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
7. 7.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) console.log() (d) let
8. 8.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, name! (d) Hi, Meera!
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 8;
   console.log(x + y); (a) Error (b) 28 (c) 10
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) Error (b) 67 (c) 13
11. 11.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 15;
    runs = runs - 11;
    console.log(runs);
12. 12.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
13. 13.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) Welcome, Meera! (d) name
14. 14.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 17;
    apples = apples - 9;
    console.log(apples);
15. 15.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) if
16. 16.⚡ What number does this code print?
    let a = 26;
    let b = 13;
    console.log(a - b);
17. 17.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Riya! (c) Welcome, name! (d) Riya
18. 18.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 13;
    marks = marks - 10;
    console.log(marks);
19. 19.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Arjun! (c) name (d) Arjun
20. 20.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Hello, name! (d) Aman
21. 21.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 2;
    coins = coins - 12;
    console.log(coins);
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Aman! (d) Aman
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 59 (b) Error (c) 14
24. 24.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) let (d) for
25. 25.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
26. 26.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) 53 (c) Error
28. 28.⚡ What number does this code print?
    let a = 20;
    let b = 29;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) 46 (c) Error
30. 30.⚡ What number does this code print?
    let a = 10;
    let b = 7;
    console.log(a - b);
31. 31.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
32. 32.⚡ What number does this code print?
    let a = 56;
    let b = 27;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 10;
    let b = 12;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);
36. 36.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Meera! (d) Meera
37. 37.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) Hi, Riya! (d) name
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 98 (b) Error (c) 17
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 5 (b) 14 (c) Error

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