JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 447 · 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 apples = 24;
   apples = apples + 13;
   apples = apples - 33;
   console.log(apples);
2. 2.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
3. 3.⚡ What number does this code print?
   let score = 13;
   score = score + 12;
   score = score - 25;
   console.log(score);
4. 4.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) for (d) alert()
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) alert() (d) console.log()
7. 7.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Zoya! (d) Zoya
8. 8.⚡ What number does this code print?
   let a = 11;
   let b = 12;
   console.log(a * b);
9. 9.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) Error (c) 44
11. 11.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) alert()
12. 12.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) only colours (d) the domain name
13. 13.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 4;
    marks = marks - 19;
    console.log(marks);
14. 14.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 2;
    runs = runs - 7;
    console.log(runs);
15. 15.⚡ 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
16. 16.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 28 (b) Error (c) 10
18. 18.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) alert() (d) if
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 88 (b) Error (c) 16
20. 20.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 35;
    let b = 3;
    console.log(a + b);
22. 22.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) Hello, name! (d) name
23. 23.⚡ What number does this code print?
    let books = 30;
    books = books + 4;
    books = books - 31;
    console.log(books);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 6 (b) Error (c) 42
25. 25.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) on the printer (d) in the address bar
26. 26.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 13;
    apples = apples - 24;
    console.log(apples);
27. 27.⚡ What number does this code print?
    let a = 22;
    let b = 26;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let a = 10;
    let b = 4;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 5;
    marks = marks - 15;
    console.log(marks);
30. 30.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <code> (d) <style>
31. 31.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 14;
    runs = runs - 34;
    console.log(runs);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 14 (b) Error (c) 95
33. 33.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
34. 34.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 6;
    runs = runs - 25;
    console.log(runs);
35. 35.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 15;
    coins = coins - 16;
    console.log(coins);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 3 (c) 21
38. 38.⚡ What number does this code print?
    let books = 12;
    books = books + 14;
    books = books - 19;
    console.log(books);
39. 39.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Arjun (d) Well done, name!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 15 (b) 96 (c) Error

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