JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 374 · 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.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) let (d) console.log()
3. 3.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Riya! (d) Riya
4. 4.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 2;
   console.log(x + y); (a) 11 (b) Error (c) 92
6. 6.⚡ What number does this code print?
   let coins = 23;
   coins = coins + 15;
   coins = coins - 5;
   console.log(coins);
7. 7.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) if (d) for
8. 8.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
9. 9.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
10. 10.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
11. 11.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
12. 12.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) let (d) for
13. 13.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) if (d) console.log()
14. 14.⚡ What number does this code print?
    let a = 16;
    let b = 37;
    console.log(a + b);
15. 15.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 15;
    marks = marks - 13;
    console.log(marks);
16. 16.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, Kabir! (d) Hi, name!
17. 17.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) Error (c) 49
19. 19.⚡ What number does this code print?
    let a = 8;
    let b = 40;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 43;
    let b = 8;
    console.log(a + b);
21. 21.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Hi, name! (d) Aman
22. 22.⚡ What number does this code print?
    let a = 3;
    let b = 9;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let a = 27;
    let b = 32;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 16;
    apples = apples - 11;
    console.log(apples);
25. 25.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
26. 26.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 5;
    runs = runs - 18;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 18;
    runs = runs - 9;
    console.log(runs);
28. 28.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Hello, name! (c) name (d) Aman
29. 29.⚡ What number does this code print?
    let books = 21;
    books = books + 13;
    books = books - 5;
    console.log(books);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) Error (c) 67
31. 31.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 16;
    coins = coins - 22;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let a = 5;
    let b = 34;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let a = 11;
    let b = 9;
    console.log(a * b);
34. 34.⚡ What number does this code print?
    let a = 37;
    let b = 39;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 12;
    let b = 4;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let a = 54;
    let b = 37;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let a = 25;
    let b = 20;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 12;
    apples = apples - 4;
    console.log(apples);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) 5 (c) Error
40. 40.⚡ What number does this code print?
    let books = 18;
    books = books + 2;
    books = books - 20;
    console.log(books);

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