JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 339 · 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 print? (Look at the quotes!)
   let x = "9";
   let y = 6;
   console.log(x + y); (a) 15 (b) Error (c) 96
2. 2.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
3. 3.⚡ What number does this code print?
   let score = 9;
   score = score + 11;
   score = score - 13;
   console.log(score);
4. 4.⚡ What number does this code print?
   let a = 31;
   let b = 28;
   console.log(a + b);
5. 5.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) alert() (d) if
6. 6.⚡ What number does this code print?
   let coins = 18;
   coins = coins + 18;
   coins = coins - 27;
   console.log(coins);
7. 7.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
8. 8.⚡ What number does this code print?
   let a = 7;
   let b = 7;
   console.log(a * b);
9. 9.⚡ What number does this code print?
   let books = 28;
   books = books + 14;
   books = books - 5;
   console.log(books);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 12 (b) 75 (c) Error
11. 11.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a * b);
12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, name! (d) Hi, Kabir!
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) Error (c) 25
14. 14.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) let (d) console.log()
15. 15.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) if (d) let
16. 16.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Welcome, name! (d) Meera
17. 17.⚡ What number does this code print?
    let a = 23;
    let b = 10;
    console.log(a + b);
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 69 (b) 15 (c) Error
20. 20.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) for
22. 22.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 7;
    runs = runs - 17;
    console.log(runs);
23. 23.⚡ What number does this code print?
    let a = 9;
    let b = 4;
    console.log(a * b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) Error (b) 48 (c) 12
25. 25.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 20;
    coins = coins - 5;
    console.log(coins);
26. 26.⚡ What number does this code print?
    let books = 29;
    books = books + 9;
    books = books - 33;
    console.log(books);
27. 27.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 19;
    apples = apples - 7;
    console.log(apples);
28. 28.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 10 (b) 55 (c) Error
30. 30.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 2;
    coins = coins - 15;
    console.log(coins);
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 a = 22;
    let b = 35;
    console.log(a + b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) Error (c) 77
34. 34.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) name (b) Kabir (c) Well done, Kabir! (d) Well done, name!
35. 35.⚡ What number does this code print?
    let a = 29;
    let b = 38;
    console.log(a + b);
36. 36.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
37. 37.⚡ What number does this code print?
    let a = 31;
    let b = 8;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
39. 39.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) 35 (c) Error

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