JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 874 · 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("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, name! (d) Hello, Kabir!
2. 2.⚡ What number does this code print?
   let coins = 30;
   coins = coins + 5;
   coins = coins - 18;
   console.log(coins);
3. 3.⚡ 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
4. 4.⚡ Which JavaScript word repeats code? (a) let (b) if (c) console.log() (d) for
5. 5.⚡ What number does this code print?
   let coins = 7;
   coins = coins + 16;
   coins = coins - 22;
   console.log(coins);
6. 6.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) if (d) for
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 3;
   console.log(x + y); (a) Error (b) 73 (c) 10
8. 8.⚡ What number does this code print?
   let a = 2;
   let b = 12;
   console.log(a * b);
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) let
10. 10.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
11. 11.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) Kabir (c) name (d) Well done, name!
12. 12.⚡ What number does this code print?
    let a = 46;
    let b = 25;
    console.log(a + b);
13. 13.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) console.log() (d) alert()
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) 43 (c) Error
15. 15.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 3;
    apples = apples - 12;
    console.log(apples);
16. 16.⚡ What number does this code print?
    let a = 2;
    let b = 8;
    console.log(a * b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 18 (b) Error (c) 99
18. 18.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 10;
    let b = 8;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let a = 6;
    let b = 11;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 36;
    let b = 3;
    console.log(a - b);
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, Riya! (b) name (c) Riya (d) Hi, name!
23. 23.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 16;
    coins = coins - 4;
    console.log(coins);
24. 24.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
25. 25.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Kabir (c) Welcome, Kabir! (d) Welcome, name!
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, Arjun! (c) name (d) Welcome, name!
28. 28.⚡ What number does this code print?
    let a = 2;
    let b = 7;
    console.log(a * b);
29. 29.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Arjun (d) Welcome, Arjun!
30. 30.⚡ What number does this code print?
    let a = 50;
    let b = 12;
    console.log(a - b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 94 (b) 13 (c) Error
32. 32.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
33. 33.⚡ What number does this code print?
    let books = 24;
    books = books + 2;
    books = books - 3;
    console.log(books);
34. 34.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 10;
    marks = marks - 13;
    console.log(marks);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 96 (b) Error (c) 15
36. 36.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 18;
    marks = marks - 6;
    console.log(marks);
37. 37.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 4;
    apples = apples - 18;
    console.log(apples);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) 3 (c) Error
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) Well done, Riya! (c) name (d) Well done, name!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) 41 (c) Error

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