JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 482 · 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) console.log() (b) if (c) let (d) for
2. 2.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, Aman! (d) Welcome, name!
3. 3.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) alert()
4. 4.⚡ What number does this code print?
   let a = 2;
   let b = 2;
   console.log(a * b);
5. 5.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) let (d) alert()
6. 6.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Arjun (d) Well done, Arjun!
7. 7.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
8. 8.⚡ What number does this code print?
   let a = 20;
   let b = 1;
   console.log(a - b);
9. 9.⚡ What number does this code print?
   let a = 5;
   let b = 15;
   console.log(a + b);
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
11. 11.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
12. 12.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
13. 13.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
14. 14.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
15. 15.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, name! (d) Hello, Aman!
16. 16.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) console.log() (d) let
17. 17.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 19;
    marks = marks - 19;
    console.log(marks);
18. 18.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 12;
    marks = marks - 10;
    console.log(marks);
19. 19.⚡ What number does this code print?
    let books = 29;
    books = books + 12;
    books = books - 3;
    console.log(books);
20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, Riya! (b) name (c) Riya (d) Hi, name!
21. 21.⚡ What number does this code print?
    let a = 48;
    let b = 35;
    console.log(a + b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) Error (b) 59 (c) 14
23. 23.⚡ What number does this code print?
    let a = 35;
    let b = 34;
    console.log(a + b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 27 (c) 9
25. 25.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Arjun! (c) Arjun (d) name
26. 26.⚡ What number does this code print?
    let a = 54;
    let b = 20;
    console.log(a - b);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, name! (d) Hi, Kabir!
28. 28.⚡ What number does this code print?
    let a = 6;
    let b = 12;
    console.log(a * b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) Error (b) 12 (c) 57
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 56 (b) Error (c) 11
31. 31.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) Error (b) 86 (c) 14
33. 33.⚡ What number does this code print?
    let books = 12;
    books = books + 19;
    books = books - 19;
    console.log(books);
34. 34.⚡ Which JavaScript word repeats code? (a) for (b) if (c) let (d) alert()
35. 35.⚡ What number does this code print?
    let score = 24;
    score = score + 13;
    score = score - 17;
    console.log(score);
36. 36.⚡ What number does this code print?
    let a = 12;
    let b = 12;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
38. 38.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Zoya (c) name (d) Hello, name!
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Hello, name! (d) Meera
40. 40.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);

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