JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 492 · 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) in the address bar (b) on the printer (c) in the console (d) on the title bar
2. 2.⚡ What number does this code print?
   let apples = 8;
   apples = apples + 14;
   apples = apples - 2;
   console.log(apples);
3. 3.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
4. 4.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Zoya! (d) Zoya
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
6. 6.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) if (d) console.log()
7. 7.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) if (d) for
8. 8.⚡ What number does this code print?
   let a = 2;
   let b = 11;
   console.log(a * b);
9. 9.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) Aman (d) name
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 14 (b) Error (c) 86
11. 11.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 29 (b) Error (c) 11
13. 13.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Aman (d) Hi, name!
14. 14.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
15. 15.⚡ What number does this code print?
    let a = 3;
    let b = 10;
    console.log(a * b);
16. 16.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) name (d) Well done, Meera!
17. 17.⚡ What number does this code print?
    let books = 5;
    books = books + 8;
    books = books - 13;
    console.log(books);
18. 18.⚡ What number does this code print?
    let score = 22;
    score = score + 13;
    score = score - 12;
    console.log(score);
19. 19.⚡ Which JavaScript word repeats code? (a) let (b) for (c) alert() (d) if
20. 20.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let books = 9;
    books = books + 12;
    books = books - 10;
    console.log(books);
22. 22.⚡ What number does this code print?
    let a = 57;
    let b = 11;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
24. 24.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, name! (d) Hi, Aman!
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2
26. 26.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 13;
    runs = runs - 6;
    console.log(runs);
27. 27.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) for (d) let
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) 66 (c) Error
29. 29.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, name! (d) Hello, Aman!
30. 30.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, name! (d) Well done, Kabir!
31. 31.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) Error (c) 18
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 45 (b) 9 (c) Error
34. 34.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) alert() (d) console.log()
35. 35.⚡ What number does this code print?
    let a = 12;
    let b = 8;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let a = 19;
    let b = 31;
    console.log(a + b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 44 (c) 8
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 59 (b) Error (c) 14
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
40. 40.⚡ What number does this code print?
    let a = 54;
    let b = 20;
    console.log(a + b);

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