JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 472 · 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 = "Arjun";
   console.log("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
2. 2.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) alert() (d) console.log()
3. 3.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) name (d) Welcome, name!
4. 4.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) for (d) let
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
6. 6.⚡ What number does this code print?
   let a = 20;
   let b = 16;
   console.log(a - b);
7. 7.⚡ 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
8. 8.⚡ What number does this code print?
   let runs = 6;
   runs = runs + 2;
   runs = runs - 3;
   console.log(runs);
9. 9.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
10. 10.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
11. 11.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 18;
    coins = coins - 6;
    console.log(coins);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 76 (b) Error (c) 13
13. 13.⚡ What number does this code print?
    let a = 23;
    let b = 11;
    console.log(a - b);
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) let (d) console.log()
15. 15.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) let (d) console.log()
16. 16.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let a = 29;
    let b = 22;
    console.log(a - b);
18. 18.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
19. 19.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Aman! (d) Aman
20. 20.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) console.log() (d) let
21. 21.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
22. 22.⚡ What number does this code print?
    let a = 12;
    let b = 23;
    console.log(a + b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 56 (b) Error (c) 11
24. 24.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) name (d) Hi, Riya!
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 22 (c) 4
26. 26.⚡ What number does this code print?
    let a = 5;
    let b = 22;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 13;
    apples = apples - 19;
    console.log(apples);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) Error (c) 34
29. 29.⚡ What number does this code print?
    let a = 4;
    let b = 8;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 11;
    runs = runs - 28;
    console.log(runs);
31. 31.⚡ 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
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) Error (b) 11 (c) 74
33. 33.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, Zoya! (d) Hello, name!
34. 34.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a * b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) 8 (c) Error
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 14 (b) 68 (c) Error
37. 37.⚡ What number does this code print?
    let a = 40;
    let b = 37;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 44;
    let b = 34;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let books = 7;
    books = books + 17;
    books = books - 4;
    console.log(books);
40. 40.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, name! (d) Hi, Meera!

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