JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 798 · 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 word makes a new variable? (a) make (b) put (c) let (d) give
2. 2.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
3. 3.⚡ What number does this code print?
   let a = 19;
   let b = 20;
   console.log(a + b);
4. 4.⚡ What number does this code print?
   let coins = 17;
   coins = coins + 2;
   coins = coins - 12;
   console.log(coins);
5. 5.⚡ What number does this code print?
   let a = 57;
   let b = 5;
   console.log(a - b);
6. 6.⚡ What number does this code print?
   let a = 27;
   let b = 22;
   console.log(a - b);
7. 7.⚡ What number does this code print?
   let a = 3;
   let b = 9;
   console.log(a * b);
8. 8.⚡ What number does this code print?
   let apples = 28;
   apples = apples + 10;
   apples = apples - 3;
   console.log(apples);
9. 9.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
11. 11.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) alert() (d) let
12. 12.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) let (d) alert()
13. 13.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 10;
    coins = coins - 15;
    console.log(coins);
14. 14.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) console.log() (d) if
16. 16.⚡ What number does this code print?
    let a = 53;
    let b = 40;
    console.log(a - b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) Error (c) 81
18. 18.⚡ What number does this code print?
    let books = 25;
    books = books + 9;
    books = books - 31;
    console.log(books);
19. 19.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a - b);
20. 20.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 19;
    apples = apples - 11;
    console.log(apples);
21. 21.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Kabir (d) Well done, name!
22. 22.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);
23. 23.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) name (d) Well done, Aman!
24. 24.⚡ What number does this code print?
    let a = 28;
    let b = 17;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, name! (d) Hello, Kabir!
26. 26.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) let (d) alert()
27. 27.⚡ 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
28. 28.⚡ What number does this code print?
    let score = 7;
    score = score + 15;
    score = score - 4;
    console.log(score);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) 36 (c) Error
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 73 (b) Error (c) 10
31. 31.⚡ What number does this code print?
    let books = 14;
    books = books + 6;
    books = books - 14;
    console.log(books);
32. 32.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
33. 33.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Arjun (b) Welcome, Arjun! (c) Welcome, name! (d) name
34. 34.⚡ What number does this code print?
    let a = 54;
    let b = 3;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 9 (b) Error (c) 45
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 11 (b) Error (c) 38
37. 37.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 20;
    marks = marks - 13;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let a = 33;
    let b = 19;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 2;
    let b = 7;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let score = 17;
    score = score + 20;
    score = score - 8;
    console.log(score);

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