JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 159 · 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 JavaScript add to a web page? (a) actions and changes (b) the domain name (c) the page title (d) only colours
2. 2.⚡ What does this code show?
   let name = "Arjun";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Arjun (d) Hello, Arjun!
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 2;
   console.log(x + y); (a) 7 (b) Error (c) 52
4. 4.⚡ What number does this code print?
   let books = 6;
   books = books + 4;
   books = books - 5;
   console.log(books);
5. 5.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
6. 6.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) let
7. 7.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
8. 8.⚡ What number does this code print?
   let a = 3;
   let b = 10;
   console.log(a * b);
9. 9.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) Well done, Riya! (d) name
10. 10.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) let (d) for
11. 11.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) for (d) let
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) Error (c) 64
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) Error (c) 46
14. 14.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
15. 15.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 10;
    marks = marks - 10;
    console.log(marks);
16. 16.⚡ What number does this code print?
    let a = 38;
    let b = 16;
    console.log(a - b);
17. 17.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, Meera! (b) Well done, name! (c) Meera (d) name
18. 18.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Arjun! (c) name (d) Arjun
19. 19.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) name (c) Welcome, name! (d) Welcome, Aman!
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) Error (b) 11 (c) 38
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
22. 22.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, name! (d) Hi, Zoya!
23. 23.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) console.log() (d) if
24. 24.⚡ What number does this code print?
    let a = 19;
    let b = 3;
    console.log(a + b);
25. 25.⚡ 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
26. 26.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Meera (d) Welcome, name!
27. 27.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 6 (c) 15
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 5 (c) 41
30. 30.⚡ What number does this code print?
    let a = 10;
    let b = 12;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 9;
    coins = coins - 25;
    console.log(coins);
32. 32.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Hello, name! (d) Aman
33. 33.⚡ What number does this code print?
    let books = 28;
    books = books + 3;
    books = books - 22;
    console.log(books);
34. 34.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Kabir (d) Well done, name!
35. 35.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) name (d) Welcome, Arjun!
36. 36.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) name (d) Hi, name!
37. 37.⚡ What number does this code print?
    let a = 8;
    let b = 4;
    console.log(a * b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 71 (b) Error (c) 8
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
40. 40.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Meera! (c) name (d) Meera

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