JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 73 · 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.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) for
2. 2.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) alert() (d) for
3. 3.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) if (d) alert()
4. 4.⚡ What number does this code print?
   let a = 46;
   let b = 2;
   console.log(a - b);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 3;
   console.log(x + y); (a) 7 (b) Error (c) 43
6. 6.⚡ What number does this code print?
   let apples = 12;
   apples = apples + 18;
   apples = apples - 21;
   console.log(apples);
7. 7.⚡ What number does this code print?
   let a = 52;
   let b = 2;
   console.log(a + b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 9;
   console.log(x + y); (a) Error (b) 79 (c) 16
9. 9.⚡ What number does this code print?
   let a = 25;
   let b = 24;
   console.log(a + b);
10. 10.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
11. 11.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
12. 12.⚡ What number does this code print?
    let a = 21;
    let b = 2;
    console.log(a - b);
13. 13.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Zoya! (d) Zoya
14. 14.⚡ What number does this code print?
    let a = 41;
    let b = 27;
    console.log(a + b);
15. 15.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 4;
    marks = marks - 26;
    console.log(marks);
16. 16.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) name (c) Riya (d) Hi, name!
17. 17.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
18. 18.⚡ What number does this code print?
    let a = 24;
    let b = 15;
    console.log(a - b);
19. 19.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) name (d) Well done, Aman!
20. 20.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 19;
    coins = coins - 21;
    console.log(coins);
21. 21.⚡ 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
22. 22.⚡ What number does this code print?
    let a = 45;
    let b = 18;
    console.log(a - b);
23. 23.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
24. 24.⚡ What number does this code print?
    let a = 46;
    let b = 3;
    console.log(a + b);
25. 25.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) alert() (d) console.log()
26. 26.⚡ What number does this code print?
    let a = 40;
    let b = 4;
    console.log(a + b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) Error (c) 8
28. 28.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 4;
    marks = marks - 9;
    console.log(marks);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 8 (c) 53
30. 30.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) Welcome, name! (d) name
31. 31.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) 63 (c) Error
33. 33.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) name (d) Hi, Riya!
34. 34.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, Kabir! (c) name (d) Hi, name!
35. 35.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Meera (d) Hi, name!
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 7 (b) Error (c) 16
37. 37.⚡ What number does this code print?
    let a = 7;
    let b = 6;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let books = 19;
    books = books + 11;
    books = books - 5;
    console.log(books);
39. 39.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, name! (c) name (d) Hello, Zoya!
40. 40.⚡ What number does this code print?
    let a = 58;
    let b = 10;
    console.log(a + b);

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