JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 976 · 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 = "Arjun";
   console.log("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
2. 2.⚡ What number does this code print?
   let a = 40;
   let b = 6;
   console.log(a - b);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 8;
   console.log(x + y); (a) 12 (b) Error (c) 48
4. 4.⚡ What number does this code print?
   let apples = 6;
   apples = apples + 19;
   apples = apples - 4;
   console.log(apples);
5. 5.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) console.log() (d) alert()
7. 7.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) alert() (d) if
8. 8.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
9. 9.⚡ What number does this code print?
   let marks = 8;
   marks = marks + 15;
   marks = marks - 22;
   console.log(marks);
10. 10.⚡ What number does this code print?
    let a = 10;
    let b = 10;
    console.log(a * b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) Error (b) 39 (c) 12
12. 12.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Meera! (c) Well done, name! (d) Meera
13. 13.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) if (d) for
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) 62 (c) Error
15. 15.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Arjun! (d) Arjun
16. 16.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) name (c) Hi, name! (d) Hi, Riya!
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) Error (b) 9 (c) 18
19. 19.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) let (d) console.log()
20. 20.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Hello, name! (c) name (d) Meera
21. 21.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 6;
    apples = apples - 20;
    console.log(apples);
22. 22.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
23. 23.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 4;
    marks = marks - 14;
    console.log(marks);
24. 24.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) name (d) Welcome, Arjun!
25. 25.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Arjun! (c) Arjun (d) Welcome, name!
26. 26.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 13;
    marks = marks - 1;
    console.log(marks);
27. 27.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
28. 28.⚡ What number does this code print?
    let books = 27;
    books = books + 12;
    books = books - 39;
    console.log(books);
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) Aman (c) name (d) Hi, name!
30. 30.⚡ What number does this code print?
    let a = 7;
    let b = 8;
    console.log(a * b);
31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Welcome, name! (c) Zoya (d) name
32. 32.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
33. 33.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) alert() (d) if
34. 34.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 5;
    marks = marks - 2;
    console.log(marks);
35. 35.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 7;
    runs = runs - 9;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let a = 54;
    let b = 24;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let a = 15;
    let b = 36;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) name (c) Well done, name! (d) Aman
39. 39.⚡ What number does this code print?
    let books = 28;
    books = books + 12;
    books = books - 33;
    console.log(books);
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Riya! (d) Riya

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