JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 590 · 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 = "Meera";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Meera (c) name (d) Well done, Meera!
2. 2.⚡ What number does this code print?
   let marks = 25;
   marks = marks + 15;
   marks = marks - 27;
   console.log(marks);
3. 3.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
4. 4.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) let
5. 5.⚡ What number does this code print?
   let a = 10;
   let b = 10;
   console.log(a * b);
6. 6.⚡ What number does this code print?
   let a = 40;
   let b = 22;
   console.log(a - b);
7. 7.⚡ What does this code show?
   let name = "Aman";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) Well done, Aman! (d) name
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 6;
   console.log(x + y); (a) 8 (b) 26 (c) Error
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
10. 10.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 4;
    apples = apples - 10;
    console.log(apples);
11. 11.⚡ What number does this code print?
    let a = 57;
    let b = 9;
    console.log(a - b);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) 63 (c) Error
13. 13.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
14. 14.⚡ What number does this code print?
    let a = 8;
    let b = 18;
    console.log(a + b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) Error (c) 58
16. 16.⚡ What number does this code print?
    let books = 24;
    books = books + 5;
    books = books - 9;
    console.log(books);
17. 17.⚡ What number does this code print?
    let books = 23;
    books = books + 16;
    books = books - 4;
    console.log(books);
18. 18.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) alert() (d) let
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) let
20. 20.⚡ What number does this code print?
    let a = 2;
    let b = 5;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 5;
    apples = apples - 24;
    console.log(apples);
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
23. 23.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Hello, name! (d) Riya
24. 24.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) if (d) console.log()
25. 25.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
26. 26.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
27. 27.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Arjun! (c) Arjun (d) Well done, name!
28. 28.⚡ What number does this code print?
    let a = 6;
    let b = 11;
    console.log(a * b);
29. 29.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a table (d) a new tab
30. 30.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) Kabir (c) name (d) Hello, name!
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 65 (b) 11 (c) Error
32. 32.⚡ What number does this code print?
    let a = 42;
    let b = 23;
    console.log(a - b);
33. 33.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) name (d) Hi, Riya!
34. 34.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Zoya (d) Hello, Zoya!
35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) Welcome, Meera! (d) name
36. 36.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
37. 37.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 15;
    coins = coins - 26;
    console.log(coins);
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!
39. 39.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
40. 40.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 14;
    coins = coins - 10;
    console.log(coins);

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