JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 812 · 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 tag holds JavaScript in a page? (a) <js> (b) <script> (c) <code> (d) <style>
2. 2.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
3. 3.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
4. 4.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) name (d) Hi, Arjun!
5. 5.⚡ What number does this code print?
   let runs = 28;
   runs = runs + 6;
   runs = runs - 28;
   console.log(runs);
6. 6.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 3;
   console.log(x + y); (a) 7 (b) 43 (c) Error
8. 8.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) for
9. 9.⚡ What does this code show?
   let name = "Zoya";
   console.log("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, name! (d) Welcome, Zoya!
10. 10.⚡ What number does this code print?
    let a = 36;
    let b = 19;
    console.log(a - b);
11. 11.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 10;
    marks = marks - 6;
    console.log(marks);
12. 12.⚡ What number does this code print?
    let a = 16;
    let b = 12;
    console.log(a + b);
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
14. 14.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, name! (d) Hi, Meera!
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 63 (b) Error (c) 9
16. 16.⚡ Which JavaScript word repeats code? (a) for (b) let (c) if (d) alert()
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Riya! (d) Riya
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 7 (b) Error (c) 61
19. 19.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) name (d) Aman
20. 20.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
21. 21.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) Well done, name! (c) Aman (d) name
22. 22.⚡ What number does this code print?
    let a = 44;
    let b = 4;
    console.log(a - b);
23. 23.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) let (d) alert()
24. 24.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) let (d) alert()
25. 25.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 2;
    marks = marks - 11;
    console.log(marks);
26. 26.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) name (c) Zoya (d) Hello, name!
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) Error (b) 12 (c) 48
28. 28.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 14;
    marks = marks - 21;
    console.log(marks);
29. 29.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) Meera (c) Hello, name! (d) name
30. 30.⚡ What number does this code print?
    let score = 15;
    score = score + 11;
    score = score - 4;
    console.log(score);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) Error (b) 10 (c) 73
32. 32.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 9;
    apples = apples - 11;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let a = 28;
    let b = 14;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 11;
    coins = coins - 16;
    console.log(coins);
35. 35.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) for (d) let
36. 36.⚡ What number does this code print?
    let score = 30;
    score = score + 2;
    score = score - 25;
    console.log(score);
37. 37.⚡ What number does this code print?
    let books = 14;
    books = books + 11;
    books = books - 19;
    console.log(books);
38. 38.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let a = 50;
    let b = 22;
    console.log(a + b);
40. 40.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Arjun! (d) Arjun

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