JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 788 · 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 score = 5;
   score = score + 15;
   score = score - 20;
   console.log(score);
2. 2.⚡ 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
3. 3.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!
4. 4.⚡ What does this code show?
   let name = "Arjun";
   console.log("Welcome, " + name + "!"); (a) name (b) Arjun (c) Welcome, name! (d) Welcome, Arjun!
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 2;
   console.log(x + y); (a) Error (b) 4 (c) 22
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 3;
   console.log(x + y); (a) 23 (b) Error (c) 5
7. 7.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
8. 8.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) Hi, Riya! (d) name
9. 9.⚡ What number does this code print?
   let a = 56;
   let b = 26;
   console.log(a + b);
10. 10.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
11. 11.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) name (d) Hi, name!
12. 12.⚡ What number does this code print?
    let a = 6;
    let b = 6;
    console.log(a * b);
13. 13.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) if (d) alert()
14. 14.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) name (c) Hello, name! (d) Arjun
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 76 (b) 13 (c) Error
16. 16.⚡ What number does this code print?
    let books = 9;
    books = books + 8;
    books = books - 5;
    console.log(books);
17. 17.⚡ What number does this code print?
    let a = 37;
    let b = 5;
    console.log(a + b);
18. 18.⚡ 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
19. 19.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) Error (b) 11 (c) 83
21. 21.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 17;
    apples = apples - 19;
    console.log(apples);
22. 22.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 2;
    coins = coins - 7;
    console.log(coins);
23. 23.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 2;
    coins = coins - 9;
    console.log(coins);
24. 24.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
25. 25.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) console.log() (d) alert()
26. 26.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, Meera! (d) Hello, name!
27. 27.⚡ Which JavaScript word repeats code? (a) if (b) for (c) console.log() (d) let
28. 28.⚡ What number does this code print?
    let score = 5;
    score = score + 15;
    score = score - 8;
    console.log(score);
29. 29.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) alert() (d) if
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Meera! (c) name (d) Meera
31. 31.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 6;
    coins = coins - 7;
    console.log(coins);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 7 (b) Error (c) 61
33. 33.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Kabir! (d) Kabir
34. 34.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 11;
    coins = coins - 5;
    console.log(coins);
35. 35.⚡ What number does this code print?
    let a = 3;
    let b = 8;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let a = 11;
    let b = 38;
    console.log(a + b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 11 (b) Error (c) 38
38. 38.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Arjun (c) Hello, Arjun! (d) name
39. 39.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
40. 40.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Arjun! (c) Arjun (d) name

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