JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 880 · 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("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, Meera! (d) Hi, name!
2. 2.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
3. 3.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) console.log() (d) let
4. 4.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
5. 5.⚡ What number does this code print?
   let a = 8;
   let b = 10;
   console.log(a * b);
6. 6.⚡ What number does this code print?
   let score = 9;
   score = score + 17;
   score = score - 16;
   console.log(score);
7. 7.⚡ What does this code show?
   let name = "Zoya";
   console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) name (c) Zoya (d) Welcome, name!
8. 8.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
9. 9.⚡ What number does this code print?
   let a = 12;
   let b = 3;
   console.log(a * b);
10. 10.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) let
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) let (d) if
12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, name! (d) Hi, Kabir!
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) Error (b) 85 (c) 13
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 86 (b) 14 (c) Error
15. 15.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
16. 16.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 87 (b) 15 (c) Error
18. 18.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) if (d) console.log()
19. 19.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) Meera (d) name
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 66 (b) Error (c) 12
21. 21.⚡ What number does this code print?
    let books = 21;
    books = books + 16;
    books = books - 36;
    console.log(books);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) Error (b) 83 (c) 11
23. 23.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
24. 24.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Hello, name! (c) name (d) Zoya
25. 25.⚡ What number does this code print?
    let a = 40;
    let b = 40;
    console.log(a - b);
26. 26.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!
27. 27.⚡ What number does this code print?
    let a = 18;
    let b = 32;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let a = 57;
    let b = 13;
    console.log(a + b);
29. 29.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) name (d) Hi, name!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) Error (c) 33
31. 31.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
32. 32.⚡ What number does this code print?
    let score = 8;
    score = score + 15;
    score = score - 5;
    console.log(score);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 10 (c) 82
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 2 (b) Error (c) 11
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 16 (b) 7 (c) Error
36. 36.⚡ 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
37. 37.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Hello, name! (d) Zoya
38. 38.⚡ What number does this code print?
    let a = 7;
    let b = 11;
    console.log(a * b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) Error (c) 67
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name

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