JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 925 · 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 a = 2;
   let b = 11;
   console.log(a * b);
2. 2.⚡ 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
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 4;
   console.log(x + y); (a) 24 (b) Error (c) 6
4. 4.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
5. 5.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
6. 6.⚡ What does this code show?
   let name = "Riya";
   alert("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, name! (d) Welcome, Riya!
7. 7.⚡ What does this code show?
   let name = "Meera";
   alert("Well done, " + name + "!"); (a) Well done, Meera! (b) Meera (c) Well done, name! (d) name
8. 8.⚡ What number does this code print?
   let books = 9;
   books = books + 11;
   books = books - 16;
   console.log(books);
9. 9.⚡ What number does this code print?
   let a = 48;
   let b = 14;
   console.log(a - b);
10. 10.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) for (d) console.log()
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 19 (b) 10 (c) Error
12. 12.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 3;
    coins = coins - 7;
    console.log(coins);
13. 13.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 10;
    apples = apples - 2;
    console.log(apples);
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) for (d) let
15. 15.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
16. 16.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 13;
    coins = coins - 9;
    console.log(coins);
17. 17.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
18. 18.⚡ What number does this code print?
    let a = 24;
    let b = 8;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 5;
    apples = apples - 29;
    console.log(apples);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) Error (b) 77 (c) 14
21. 21.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) let (d) for
22. 22.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
23. 23.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
24. 24.⚡ What number does this code print?
    let a = 54;
    let b = 20;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 41;
    let b = 37;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let score = 23;
    score = score + 9;
    score = score - 26;
    console.log(score);
27. 27.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) name (c) Hi, name! (d) Hi, Zoya!
28. 28.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Arjun! (c) Arjun (d) name
29. 29.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 18 (b) Error (c) 99
31. 31.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 7;
    marks = marks - 21;
    console.log(marks);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 9 (b) 45 (c) Error
33. 33.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
34. 34.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, Aman! (d) Well done, name!
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 8 (b) 26 (c) Error
36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) name (d) Hello, name!
37. 37.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) if (d) let
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 17 (b) Error (c) 8
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) Hi, name! (c) name (d) Hi, Meera!
40. 40.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) Aman (d) name

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