JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 385 · 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 number does this code print?
   let a = 8;
   let b = 3;
   console.log(a * b);
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 5;
   console.log(x + y); (a) 55 (b) Error (c) 10
3. 3.⚡ What number does this code print?
   let a = 15;
   let b = 26;
   console.log(a + b);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 8;
   console.log(x + y); (a) 18 (b) 9 (c) Error
5. 5.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) if (d) console.log()
7. 7.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) for (d) alert()
8. 8.⚡ What number does this code print?
   let marks = 24;
   marks = marks + 17;
   marks = marks - 26;
   console.log(marks);
9. 9.⚡ What number does this code print?
   let a = 55;
   let b = 29;
   console.log(a + b);
10. 10.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 89 (b) 17 (c) Error
12. 12.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 19;
    coins = coins - 25;
    console.log(coins);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 19 (b) 10 (c) Error
14. 14.⚡ What number does this code print?
    let a = 6;
    let b = 1;
    console.log(a - b);
15. 15.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
17. 17.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, name! (d) Hello, Arjun!
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) name (d) Aman
19. 19.⚡ What number does this code print?
    let books = 25;
    books = books + 15;
    books = books - 11;
    console.log(books);
20. 20.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
21. 21.⚡ What number does this code print?
    let books = 14;
    books = books + 10;
    books = books - 23;
    console.log(books);
22. 22.⚡ What number does this code print?
    let a = 53;
    let b = 27;
    console.log(a - b);
23. 23.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) name (c) Welcome, Riya! (d) Welcome, name!
24. 24.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) for (d) let
25. 25.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a * b);
26. 26.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
27. 27.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 12;
    marks = marks - 21;
    console.log(marks);
28. 28.⚡ What number does this code print?
    let a = 41;
    let b = 7;
    console.log(a - b);
29. 29.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) if (d) alert()
30. 30.⚡ 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
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 37 (b) Error (c) 10
32. 32.⚡ What number does this code print?
    let score = 18;
    score = score + 11;
    score = score - 9;
    console.log(score);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 5 (c) 32
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) 25 (c) Error
35. 35.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 3;
    coins = coins - 30;
    console.log(coins);
36. 36.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 11;
    apples = apples - 12;
    console.log(apples);
37. 37.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Meera (d) Hello, Meera!
40. 40.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) alert() (d) console.log()

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