JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 731 · 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 = 17;
   let b = 10;
   console.log(a - b);
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
3. 3.⚡ What number does this code print?
   let a = 10;
   let b = 2;
   console.log(a * b);
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) let
5. 5.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) for (d) alert()
6. 6.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) for (d) alert()
7. 7.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
8. 8.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
9. 9.⚡ What number does this code print?
   let apples = 9;
   apples = apples + 8;
   apples = apples - 12;
   console.log(apples);
10. 10.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) name (c) Welcome, name! (d) Kabir
11. 11.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 5;
    marks = marks - 1;
    console.log(marks);
12. 12.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 9;
    apples = apples - 18;
    console.log(apples);
13. 13.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
14. 14.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Hello, name! (d) Meera
15. 15.⚡ 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
16. 16.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) name (d) Welcome, Meera!
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 14 (b) Error (c) 68
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Riya (d) Hi, name!
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 54 (b) Error (c) 9
20. 20.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 16;
    apples = apples - 30;
    console.log(apples);
21. 21.⚡ What number does this code print?
    let a = 30;
    let b = 11;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let a = 25;
    let b = 24;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let books = 10;
    books = books + 14;
    books = books - 19;
    console.log(books);
24. 24.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) name (d) Hi, name!
25. 25.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 11;
    marks = marks - 9;
    console.log(marks);
26. 26.⚡ What number does this code print?
    let a = 27;
    let b = 4;
    console.log(a + b);
27. 27.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, Zoya! (d) Hi, name!
28. 28.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
29. 29.⚡ What number does this code print?
    let a = 43;
    let b = 3;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 20;
    coins = coins - 23;
    console.log(coins);
31. 31.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 5;
    marks = marks - 25;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 14;
    apples = apples - 4;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let a = 9;
    let b = 10;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Zoya (d) Hello, Zoya!
35. 35.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
36. 36.⚡ What number does this code print?
    let a = 28;
    let b = 7;
    console.log(a - b);
37. 37.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) alert() (d) let
38. 38.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Aman! (d) Aman
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 82 (b) Error (c) 10
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) Error (b) 14 (c) 77

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