JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 799 · 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 = 21;
   apples = apples + 9;
   apples = apples - 7;
   console.log(apples);
2. 2.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
3. 3.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Hello, name! (c) name (d) Zoya
4. 4.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) for (d) alert()
5. 5.⚡ What number does this code print?
   let a = 7;
   let b = 29;
   console.log(a + b);
6. 6.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
7. 7.⚡ What number does this code print?
   let runs = 22;
   runs = runs + 3;
   runs = runs - 12;
   console.log(runs);
8. 8.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
9. 9.⚡ What number does this code print?
   let apples = 7;
   apples = apples + 2;
   apples = apples - 2;
   console.log(apples);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) if (d) alert()
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) Error (b) 89 (c) 17
12. 12.⚡ What number does this code print?
    let a = 8;
    let b = 4;
    console.log(a * b);
13. 13.⚡ What number does this code print?
    let a = 40;
    let b = 33;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let a = 8;
    let b = 6;
    console.log(a - b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 65 (b) Error (c) 11
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) 9 (c) Error
17. 17.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 10;
    coins = coins - 11;
    console.log(coins);
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
19. 19.⚡ What number does this code print?
    let a = 15;
    let b = 38;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 2;
    let b = 11;
    console.log(a * b);
21. 21.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) if
22. 22.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) let (d) if
23. 23.⚡ What number does this code print?
    let books = 29;
    books = books + 10;
    books = books - 11;
    console.log(books);
24. 24.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Zoya! (d) Zoya
25. 25.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Zoya! (d) Zoya
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 10 (b) 91 (c) Error
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) Well done, Riya! (c) Well done, name! (d) name
28. 28.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) Hi, name! (d) name
29. 29.⚡ What number does this code print?
    let a = 48;
    let b = 3;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let marks = 20;
    marks = marks + 20;
    marks = marks - 34;
    console.log(marks);
31. 31.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) Error (c) 5
33. 33.⚡ What number does this code print?
    let a = 32;
    let b = 4;
    console.log(a + b);
34. 34.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) name (d) Aman
35. 35.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, name! (c) name (d) Hello, Meera!
36. 36.⚡ What number does this code print?
    let a = 38;
    let b = 9;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 6;
    runs = runs - 16;
    console.log(runs);
38. 38.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Meera! (c) name (d) Meera
40. 40.⚡ What number does this code print?
    let a = 23;
    let b = 7;
    console.log(a - b);

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