JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 504 · 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.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
2. 2.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) alert() (d) console.log()
4. 4.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
5. 5.⚡ What number does this code print?
   let a = 12;
   let b = 5;
   console.log(a * b);
6. 6.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) console.log()
7. 7.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) console.log()
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 1;
   console.log(x + y); (a) 4 (b) 31 (c) Error
9. 9.⚡ What does this code show?
   let name = "Aman";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Hi, name! (d) Aman
10. 10.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) Riya (d) name
11. 11.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) 3 (c) Error
13. 13.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
14. 14.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 18;
    apples = apples - 8;
    console.log(apples);
15. 15.⚡ What number does this code print?
    let a = 10;
    let b = 10;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let a = 11;
    let b = 3;
    console.log(a * b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 85 (b) Error (c) 13
18. 18.⚡ What number does this code print?
    let a = 9;
    let b = 11;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 22;
    let b = 22;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 19;
    let b = 40;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let coins = 15;
    coins = coins + 16;
    coins = coins - 7;
    console.log(coins);
22. 22.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) alert() (d) console.log()
23. 23.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) for (d) let
24. 24.⚡ What number does this code print?
    let books = 5;
    books = books + 12;
    books = books - 16;
    console.log(books);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 38 (b) Error (c) 11
26. 26.⚡ What number does this code print?
    let a = 32;
    let b = 23;
    console.log(a - b);
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
28. 28.⚡ What number does this code print?
    let a = 5;
    let b = 7;
    console.log(a * b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) Error (b) 26 (c) 8
30. 30.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) name (c) Zoya (d) Welcome, name!
31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) Zoya (c) name (d) Well done, name!
32. 32.⚡ What number does this code print?
    let score = 18;
    score = score + 12;
    score = score - 2;
    console.log(score);
33. 33.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) Error (b) 8 (c) 17
35. 35.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Arjun! (d) Arjun
36. 36.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 4;
    coins = coins - 15;
    console.log(coins);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 11 (b) Error (c) 74
38. 38.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) name (d) Hi, name!
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 16 (b) 88 (c) Error
40. 40.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) Hello, name! (c) Hello, Arjun! (d) name

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