JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 391 · 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 score = 26;
   score = score + 4;
   score = score - 15;
   console.log(score);
2. 2.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
3. 3.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hi, " + name + "!"); (a) Zoya (b) name (c) Hi, Zoya! (d) Hi, name!
4. 4.⚡ What number does this code print?
   let a = 57;
   let b = 14;
   console.log(a + b);
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Riya! (d) Riya
6. 6.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
7. 7.⚡ What number does this code print?
   let a = 12;
   let b = 27;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let a = 60;
   let b = 14;
   console.log(a + b);
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
10. 10.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) if (d) alert()
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) for (d) if
12. 12.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) for (d) let
13. 13.⚡ What number does this code print?
    let score = 25;
    score = score + 4;
    score = score - 11;
    console.log(score);
14. 14.⚡ What number does this code print?
    let a = 22;
    let b = 3;
    console.log(a + b);
15. 15.⚡ What number does this code print?
    let books = 6;
    books = books + 2;
    books = books - 2;
    console.log(books);
16. 16.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
17. 17.⚡ Which JavaScript word repeats code? (a) for (b) if (c) let (d) alert()
18. 18.⚡ What number does this code print?
    let a = 33;
    let b = 21;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let score = 20;
    score = score + 14;
    score = score - 7;
    console.log(score);
20. 20.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 3;
    apples = apples - 8;
    console.log(apples);
21. 21.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 11;
    apples = apples - 13;
    console.log(apples);
22. 22.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 3;
    marks = marks - 2;
    console.log(marks);
23. 23.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Welcome, name! (c) name (d) Meera
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 5 (b) Error (c) 23
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, Riya! (d) Well done, name!
26. 26.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
27. 27.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) let
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) 12 (c) Error
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) Error (b) 68 (c) 14
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) 13 (c) Error
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 15 (c) 96
32. 32.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
33. 33.⚡ What number does this code print?
    let a = 10;
    let b = 10;
    console.log(a * b);
34. 34.⚡ What number does this code print?
    let a = 50;
    let b = 30;
    console.log(a - b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) Error (b) 15 (c) 69
36. 36.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 7;
    coins = coins - 1;
    console.log(coins);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) Error (c) 28
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) Error (b) 42 (c) 6
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 16 (c) 79
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) Error (b) 52 (c) 7

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