JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 208 · 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 number does this code print?
   let runs = 22;
   runs = runs + 5;
   runs = runs - 6;
   console.log(runs);
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
3. 3.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) if (d) let
4. 4.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
5. 5.⚡ What number does this code print?
   let a = 26;
   let b = 28;
   console.log(a + b);
6. 6.⚡ What does this code show?
   let name = "Riya";
   alert("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) name (d) Well done, Riya!
7. 7.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) Hello, Riya! (d) name
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 7;
   console.log(x + y); (a) Error (b) 13 (c) 67
9. 9.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
10. 10.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) for (d) if
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 32 (c) 5
12. 12.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) console.log() (d) for
13. 13.⚡ What number does this code print?
    let books = 17;
    books = books + 14;
    books = books - 18;
    console.log(books);
14. 14.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
15. 15.⚡ What number does this code print?
    let a = 5;
    let b = 11;
    console.log(a * b);
16. 16.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Kabir! (c) Kabir (d) Well done, name!
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 96 (c) 15
18. 18.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) Error (b) 55 (c) 10
20. 20.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) Well done, name! (c) name (d) Aman
21. 21.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Hi, name! (d) Aman
22. 22.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) Hello, Kabir! (d) name
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) Error (c) 4
24. 24.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) for
25. 25.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) name (d) Hello, Meera!
26. 26.⚡ What number does this code print?
    let a = 18;
    let b = 3;
    console.log(a - b);
27. 27.⚡ What number does this code print?
    let a = 28;
    let b = 22;
    console.log(a + b);
28. 28.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
29. 29.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
30. 30.⚡ What number does this code print?
    let a = 55;
    let b = 2;
    console.log(a + b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) Error (c) 2
32. 32.⚡ 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
33. 33.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) Well done, name! (c) Kabir (d) name
34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Meera! (d) Meera
35. 35.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Hi, name! (d) Arjun
36. 36.⚡ Which JavaScript word repeats code? (a) if (b) let (c) console.log() (d) for
37. 37.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 16;
    coins = coins - 22;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let a = 36;
    let b = 30;
    console.log(a - b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) Error (b) 3 (c) 12
40. 40.⚡ What number does this code print?
    let a = 33;
    let b = 27;
    console.log(a - b);

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