JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 962 · 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.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) alert() (d) console.log()
3. 3.⚡ What number does this code print?
   let a = 58;
   let b = 7;
   console.log(a + b);
4. 4.⚡ What number does this code print?
   let a = 6;
   let b = 4;
   console.log(a * b);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 8;
   console.log(x + y); (a) 58 (b) 13 (c) Error
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 8;
   console.log(x + y); (a) 15 (b) Error (c) 78
7. 7.⚡ What number does this code print?
   let score = 12;
   score = score + 12;
   score = score - 3;
   console.log(score);
8. 8.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
9. 9.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) 73 (c) Error
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 21 (c) 3
12. 12.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) if
13. 13.⚡ What number does this code print?
    let a = 43;
    let b = 31;
    console.log(a + b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) 33 (c) Error
15. 15.⚡ What number does this code print?
    let a = 13;
    let b = 9;
    console.log(a + b);
16. 16.⚡ What number does this code print?
    let a = 59;
    let b = 8;
    console.log(a + b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) Error (b) 16 (c) 88
18. 18.⚡ What number does this code print?
    let a = 11;
    let b = 38;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 6;
    let b = 11;
    console.log(a * b);
20. 20.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, Aman! (c) name (d) Well done, name!
21. 21.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
22. 22.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 3;
    coins = coins - 18;
    console.log(coins);
23. 23.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
24. 24.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) let (d) for
25. 25.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 14;
    marks = marks - 23;
    console.log(marks);
26. 26.⚡ What number does this code print?
    let score = 8;
    score = score + 18;
    score = score - 25;
    console.log(score);
27. 27.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);
28. 28.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) alert() (d) if
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 11 (c) 29
30. 30.⚡ What number does this code print?
    let books = 27;
    books = books + 16;
    books = books - 14;
    console.log(books);
31. 31.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a - b);
32. 32.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) console.log() (d) for
33. 33.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
34. 34.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) Welcome, Zoya! (d) name
35. 35.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let books = 24;
    books = books + 15;
    books = books - 13;
    console.log(books);
37. 37.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) name (c) Hi, name! (d) Hi, Arjun!
38. 38.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) Hello, name! (d) name
39. 39.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 10;
    apples = apples - 12;
    console.log(apples);
40. 40.⚡ What number does this code print?
    let a = 8;
    let b = 6;
    console.log(a * b);

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