JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 851 · 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 does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
2. 2.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Kabir! (c) Kabir (d) name
3. 3.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 2;
   console.log(x + y); (a) 22 (b) Error (c) 4
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 8;
   console.log(x + y); (a) 38 (b) Error (c) 11
6. 6.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) for (d) let
7. 7.⚡ What number does this code print?
   let books = 9;
   books = books + 2;
   books = books - 1;
   console.log(books);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 9;
   console.log(x + y); (a) 11 (b) 29 (c) Error
9. 9.⚡ What number does this code print?
   let runs = 20;
   runs = runs + 7;
   runs = runs - 14;
   console.log(runs);
10. 10.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
11. 11.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) let (d) console.log()
12. 12.⚡ What number does this code print?
    let a = 10;
    let b = 8;
    console.log(a * b);
13. 13.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, Kabir! (d) Hello, name!
14. 14.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Arjun (d) Welcome, Arjun!
15. 15.⚡ What number does this code print?
    let a = 39;
    let b = 15;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let a = 16;
    let b = 14;
    console.log(a - b);
17. 17.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
18. 18.⚡ What number does this code print?
    let books = 30;
    books = books + 20;
    books = books - 4;
    console.log(books);
19. 19.⚡ What number does this code print?
    let a = 5;
    let b = 19;
    console.log(a + b);
20. 20.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
21. 21.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 53;
    let b = 11;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let a = 18;
    let b = 3;
    console.log(a - b);
24. 24.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) if
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) Error (b) 69 (c) 15
26. 26.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 19;
    marks = marks - 9;
    console.log(marks);
27. 27.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) let (d) alert()
28. 28.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) Hi, Arjun! (d) name
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) Error (c) 31
30. 30.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) if (d) console.log()
31. 31.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, Kabir! (c) name (d) Well done, name!
32. 32.⚡ What number does this code print?
    let a = 45;
    let b = 9;
    console.log(a + b);
33. 33.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Welcome, name! (c) name (d) Zoya
34. 34.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) Error (c) 24
36. 36.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 3;
    coins = coins - 20;
    console.log(coins);
38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Hello, name! (c) name (d) Aman
39. 39.⚡ What number does this code print?
    let books = 7;
    books = books + 14;
    books = books - 12;
    console.log(books);
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!

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