JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 121 · 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 word makes a new variable? (a) give (b) let (c) put (d) make
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 4;
   console.log(x + y); (a) 13 (b) Error (c) 94
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 2;
   console.log(x + y); (a) 10 (b) Error (c) 82
4. 4.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
5. 5.⚡ What number does this code print?
   let a = 25;
   let b = 6;
   console.log(a - b);
6. 6.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, Kabir! (d) Hello, name!
7. 7.⚡ What does this code show?
   let name = "Arjun";
   console.log("Welcome, " + name + "!"); (a) name (b) Arjun (c) Welcome, name! (d) Welcome, Arjun!
8. 8.⚡ What number does this code print?
   let books = 6;
   books = books + 5;
   books = books - 6;
   console.log(books);
9. 9.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) if
10. 10.⚡ What number does this code print?
    let a = 12;
    let b = 10;
    console.log(a * b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) Error (c) 35
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) for (d) alert()
13. 13.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
14. 14.⚡ What number does this code print?
    let a = 26;
    let b = 7;
    console.log(a - b);
15. 15.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) if
16. 16.⚡ What number does this code print?
    let a = 13;
    let b = 34;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 5;
    marks = marks - 27;
    console.log(marks);
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
19. 19.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
20. 20.⚡ What number does this code print?
    let books = 21;
    books = books + 6;
    books = books - 15;
    console.log(books);
21. 21.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 5;
    coins = coins - 7;
    console.log(coins);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 11 (c) 29
23. 23.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) console.log()
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) Error (b) 63 (c) 9
25. 25.⚡ What number does this code print?
    let a = 23;
    let b = 33;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 45;
    let b = 14;
    console.log(a - b);
27. 27.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Zoya! (c) name (d) Zoya
28. 28.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 17;
    apples = apples - 3;
    console.log(apples);
29. 29.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 10;
    apples = apples - 21;
    console.log(apples);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) 3 (c) Error
31. 31.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) name (c) Arjun (d) Hi, name!
32. 32.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
33. 33.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) name (b) Meera (c) Hello, Meera! (d) Hello, name!
34. 34.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 7;
    runs = runs - 4;
    console.log(runs);
35. 35.⚡ What number does this code print?
    let a = 49;
    let b = 19;
    console.log(a - b);
36. 36.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) if (d) let
37. 37.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, name! (d) Well done, Aman!
38. 38.⚡ What number does this code print?
    let a = 27;
    let b = 23;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Aman! (d) Aman
40. 40.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Zoya (c) name (d) Welcome, name!

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