JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 551 · 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 = 54;
   let b = 18;
   console.log(a + b);
2. 2.⚡ What number does this code print?
   let a = 9;
   let b = 10;
   console.log(a * b);
3. 3.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) name (d) Aman
4. 4.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) for (d) console.log()
5. 5.⚡ What number does this code print?
   let a = 5;
   let b = 3;
   console.log(a * b);
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 4;
   console.log(x + y); (a) 13 (b) 94 (c) Error
7. 7.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) alert() (d) if
8. 8.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
9. 9.⚡ What number does this code print?
   let a = 56;
   let b = 18;
   console.log(a + b);
10. 10.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) Hi, Riya! (d) name
11. 11.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) Aman (c) Well done, name! (d) name
12. 12.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) name (c) Hi, Zoya! (d) Hi, name!
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 16 (b) Error (c) 88
14. 14.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) let (d) if
15. 15.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) alert()
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 13 (c) 49
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 10 (b) Error (c) 19
18. 18.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
19. 19.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
20. 20.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) let (d) alert()
21. 21.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
22. 22.⚡ What number does this code print?
    let a = 58;
    let b = 22;
    console.log(a + b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 3 (b) Error (c) 21
24. 24.⚡ What number does this code print?
    let books = 10;
    books = books + 16;
    books = books - 1;
    console.log(books);
25. 25.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
26. 26.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
27. 27.⚡ What number does this code print?
    let a = 30;
    let b = 17;
    console.log(a - b);
28. 28.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) Welcome, Kabir! (d) name
29. 29.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
30. 30.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) Riya (d) name
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 48 (b) Error (c) 12
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) Error (b) 92 (c) 11
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 12 (b) Error (c) 84
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) Error (b) 11 (c) 47
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 9 (b) 27 (c) Error
36. 36.⚡ What number does this code print?
    let a = 7;
    let b = 10;
    console.log(a * b);
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) Hello, Aman! (d) name
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 38 (b) 11 (c) Error
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) Hi, Riya! (d) name
40. 40.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg

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