JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 620 · 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 = "5";
   let y = 3;
   console.log(x + y); (a) Error (b) 8 (c) 53
2. 2.⚡ What number does this code print?
   let marks = 24;
   marks = marks + 20;
   marks = marks - 5;
   console.log(marks);
3. 3.⚡ What number does this code print?
   let marks = 20;
   marks = marks + 17;
   marks = marks - 2;
   console.log(marks);
4. 4.⚡ What number does this code print?
   let a = 60;
   let b = 33;
   console.log(a + b);
5. 5.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
6. 6.⚡ What number does this code print?
   let a = 17;
   let b = 11;
   console.log(a + b);
7. 7.⚡ What number does this code print?
   let a = 26;
   let b = 16;
   console.log(a - b);
8. 8.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) name (d) Hi, Meera!
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) for (d) alert()
11. 11.⚡ What number does this code print?
    let a = 10;
    let b = 29;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
13. 13.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) let (d) alert()
14. 14.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) if
15. 15.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) Hi, Arjun! (d) name
16. 16.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 7 (c) 61
18. 18.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) name (d) Welcome, name!
19. 19.⚡ What number does this code print?
    let score = 26;
    score = score + 20;
    score = score - 17;
    console.log(score);
20. 20.⚡ What number does this code print?
    let score = 7;
    score = score + 3;
    score = score - 7;
    console.log(score);
21. 21.⚡ What number does this code print?
    let books = 27;
    books = books + 7;
    books = books - 7;
    console.log(books);
22. 22.⚡ What number does this code print?
    let a = 3;
    let b = 10;
    console.log(a * b);
23. 23.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Arjun (d) Welcome, Arjun!
24. 24.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
25. 25.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) alert() (d) if
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) 81 (c) Error
27. 27.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Aman (c) name (d) Welcome, name!
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 8 (c) 44
29. 29.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 18;
    apples = apples - 15;
    console.log(apples);
30. 30.⚡ What number does this code print?
    let a = 28;
    let b = 16;
    console.log(a + b);
31. 31.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
32. 32.⚡ What number does this code print?
    let a = 32;
    let b = 12;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 12;
    runs = runs - 6;
    console.log(runs);
34. 34.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Hello, name! (d) Zoya
35. 35.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 2;
    apples = apples - 2;
    console.log(apples);
36. 36.⚡ What number does this code print?
    let score = 8;
    score = score + 8;
    score = score - 1;
    console.log(score);
37. 37.⚡ What number does this code print?
    let a = 59;
    let b = 11;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 44;
    let b = 25;
    console.log(a - b);
39. 39.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 15 (c) 87

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