JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 539 · 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 show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 8;
   console.log(x + y); (a) Error (b) 88 (c) 16
3. 3.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) let (d) alert()
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
5. 5.⚡ What number does this code print?
   let a = 7;
   let b = 8;
   console.log(a * b);
6. 6.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Zoya (d) Hello, Zoya!
7. 7.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) name (d) Hi, name!
8. 8.⚡ What number does this code print?
   let apples = 5;
   apples = apples + 12;
   apples = apples - 11;
   console.log(apples);
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) for (d) let
10. 10.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
11. 11.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) for (d) let
12. 12.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 6;
    apples = apples - 3;
    console.log(apples);
13. 13.⚡ What number does this code print?
    let a = 11;
    let b = 28;
    console.log(a + b);
14. 14.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) console.log()
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 85 (b) 13 (c) Error
16. 16.⚡ What number does this code print?
    let a = 10;
    let b = 5;
    console.log(a * b);
17. 17.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
18. 18.⚡ What number does this code print?
    let score = 24;
    score = score + 5;
    score = score - 21;
    console.log(score);
19. 19.⚡ What number does this code print?
    let a = 58;
    let b = 10;
    console.log(a + b);
20. 20.⚡ 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!
21. 21.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) Error (b) 18 (c) 99
23. 23.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) Hello, name! (d) name
24. 24.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
25. 25.⚡ 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
26. 26.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) for (d) console.log()
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) 58 (c) Error
28. 28.⚡ What number does this code print?
    let books = 14;
    books = books + 4;
    books = books - 8;
    console.log(books);
29. 29.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 5;
    let b = 9;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let books = 23;
    books = books + 11;
    books = books - 10;
    console.log(books);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 6 (b) 51 (c) Error
33. 33.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) Well done, Riya! (d) name
34. 34.⚡ 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
35. 35.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 20;
    runs = runs - 9;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let a = 37;
    let b = 5;
    console.log(a + b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 17 (b) 8 (c) Error
38. 38.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
39. 39.⚡ What number does this code print?
    let a = 45;
    let b = 37;
    console.log(a + b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) Error (c) 63

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