JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 149 · 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 JavaScript word repeats code? (a) let (b) console.log() (c) alert() (d) for
2. 2.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
3. 3.⚡ 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
4. 4.⚡ What number does this code print?
   let a = 9;
   let b = 7;
   console.log(a - b);
5. 5.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
6. 6.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) let
7. 7.⚡ What number does this code print?
   let a = 6;
   let b = 4;
   console.log(a * b);
8. 8.⚡ What number does this code print?
   let a = 35;
   let b = 22;
   console.log(a - b);
9. 9.⚡ What number does this code print?
   let a = 3;
   let b = 6;
   console.log(a * b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) Error (c) 72
11. 11.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 8;
    marks = marks - 21;
    console.log(marks);
12. 12.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 8 (c) 53
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) console.log() (d) alert()
15. 15.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) console.log() (d) if
16. 16.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Aman! (d) Aman
17. 17.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
18. 18.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 3;
    coins = coins - 7;
    console.log(coins);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) Error (b) 4 (c) 31
20. 20.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 34;
    let b = 21;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 14;
    runs = runs - 15;
    console.log(runs);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) Error (c) 41
24. 24.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) console.log()
25. 25.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);
26. 26.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Aman (c) Welcome, name! (d) name
27. 27.⚡ What number does this code print?
    let a = 45;
    let b = 18;
    console.log(a - b);
28. 28.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, Arjun! (c) Welcome, name! (d) name
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) Error (c) 32
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 39 (b) Error (c) 12
31. 31.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let books = 15;
    books = books + 17;
    books = books - 24;
    console.log(books);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) 44 (c) Error
34. 34.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, Kabir! (c) name (d) Hello, name!
35. 35.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) name (d) Hi, Aman!
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) 81 (c) Error
37. 37.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) name (d) Hi, name!
38. 38.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, Arjun! (d) Well done, name!
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) Error (b) 12 (c) 75
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 4 (c) 13

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