JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 241 · 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 = 12;
   score = score + 9;
   score = score - 2;
   console.log(score);
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 7;
   console.log(x + y); (a) Error (b) 67 (c) 13
3. 3.⚡ What number does this code print?
   let a = 31;
   let b = 13;
   console.log(a + b);
4. 4.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Meera (d) Hi, Meera!
5. 5.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) let (d) alert()
6. 6.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Arjun (d) Hi, Arjun!
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 8;
   console.log(x + y); (a) Error (b) 12 (c) 48
8. 8.⚡ What number does this code print?
   let score = 20;
   score = score + 2;
   score = score - 18;
   console.log(score);
9. 9.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) if (d) alert()
10. 10.⚡ What number does this code print?
    let a = 12;
    let b = 23;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 16;
    apples = apples - 21;
    console.log(apples);
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) let
13. 13.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
14. 14.⚡ What number does this code print?
    let a = 45;
    let b = 40;
    console.log(a + b);
15. 15.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 74 (b) 11 (c) Error
17. 17.⚡ What number does this code print?
    let a = 39;
    let b = 22;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let a = 31;
    let b = 16;
    console.log(a - b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) Error (c) 13
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) Error (b) 3 (c) 12
21. 21.⚡ Which JavaScript word repeats code? (a) let (b) for (c) console.log() (d) alert()
22. 22.⚡ What number does this code print?
    let books = 29;
    books = books + 17;
    books = books - 16;
    console.log(books);
23. 23.⚡ What number does this code print?
    let a = 43;
    let b = 26;
    console.log(a - b);
24. 24.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Arjun (d) Welcome, Arjun!
25. 25.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a * b);
26. 26.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
27. 27.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) for
28. 28.⚡ What number does this code print?
    let a = 40;
    let b = 6;
    console.log(a - b);
29. 29.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
30. 30.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 20;
    apples = apples - 20;
    console.log(apples);
31. 31.⚡ 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
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 29 (b) 11 (c) Error
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 22 (c) 4
34. 34.⚡ What number does this code print?
    let a = 15;
    let b = 9;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 16;
    marks = marks - 27;
    console.log(marks);
36. 36.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 19;
    coins = coins - 29;
    console.log(coins);
37. 37.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) name (c) Aman (d) Hello, name!
38. 38.⚡ What number does this code print?
    let a = 54;
    let b = 29;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) Well done, name! (c) name (d) Zoya
40. 40.⚡ What number does this code print?
    let a = 29;
    let b = 16;
    console.log(a + b);

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