JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 356 · 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 JavaScript word runs code when true? (a) if (b) let (c) alert() (d) console.log()
2. 2.⚡ What number does this code print?
   let coins = 9;
   coins = coins + 14;
   coins = coins - 3;
   console.log(coins);
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) let (d) if
4. 4.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, Meera! (d) Hi, name!
5. 5.⚡ What number does this code print?
   let a = 8;
   let b = 3;
   console.log(a * b);
6. 6.⚡ What number does this code print?
   let a = 37;
   let b = 7;
   console.log(a + b);
7. 7.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) name (d) Welcome, Aman!
8. 8.⚡ What number does this code print?
   let marks = 16;
   marks = marks + 18;
   marks = marks - 25;
   console.log(marks);
9. 9.⚡ What number does this code print?
   let a = 22;
   let b = 11;
   console.log(a + b);
10. 10.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 24 (b) 6 (c) Error
12. 12.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
13. 13.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 2;
    apples = apples - 26;
    console.log(apples);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) Error (c) 77
15. 15.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
16. 16.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 18;
    coins = coins - 5;
    console.log(coins);
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, Riya! (b) Hi, name! (c) Riya (d) name
18. 18.⚡ What number does this code print?
    let a = 34;
    let b = 33;
    console.log(a - b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) Error (c) 5
20. 20.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);
21. 21.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, Meera! (b) Hi, name! (c) name (d) Meera
22. 22.⚡ What number does this code print?
    let books = 9;
    books = books + 9;
    books = books - 16;
    console.log(books);
23. 23.⚡ What number does this code print?
    let books = 14;
    books = books + 16;
    books = books - 4;
    console.log(books);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 5 (c) 41
25. 25.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
26. 26.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
27. 27.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 15;
    marks = marks - 6;
    console.log(marks);
28. 28.⚡ What number does this code print?
    let a = 48;
    let b = 3;
    console.log(a + b);
29. 29.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Kabir (d) Hello, name!
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Aman (d) Hello, Aman!
31. 31.⚡ What number does this code print?
    let a = 55;
    let b = 27;
    console.log(a - b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 2 (c) 11
33. 33.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) Error (b) 55 (c) 10
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) Error (c) 18
36. 36.⚡ What number does this code print?
    let a = 30;
    let b = 16;
    console.log(a - b);
37. 37.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) alert() (d) if
38. 38.⚡ What number does this code print?
    let score = 27;
    score = score + 19;
    score = score - 6;
    console.log(score);
39. 39.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 47 (b) 11 (c) Error

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