Best Ruby Test - 83+ MCQs: Ruby test: Evaluate Your Programming Skills with Ruby Questions and Answers

1. In Ruby, what is the purpose of the 'super' keyword in a subclass?

To call the parent class's constructor

To create a new object

To define a method

To access a global variable

2. What is the purpose of Ruby's 'yield' keyword?

To define a block of code to be executed later

To create a new object

To define a class method

To declare a variable

3. In Ruby, what is a lambda?

A built-in data type

A block of code that can be assigned to a variable

A special method for defining classes

A way to create strings

4. What is the purpose of the 'tap' method in Ruby?

To define a new class

To create a new object

To modify an object and return it

To raise an exception

5. Which Ruby operator is used to check if an object belongs to a specific class or module?

is_a?

instance_of?

typeof

class_of

6. In Ruby, what is the 'self' keyword used for?

To reference the current object

To define a class

To create a new object

To access class attributes

7. In Ruby, how do you define a constant?

Using the 'const' keyword

Using the '@' symbol

Using uppercase letters

Using the 'let' keyword

8. What is the difference between '==', '===' and 'eql?' in Ruby?

'==' compares values, '===' compares values and types, 'eql?' is a synonym for '==='.

'==' compares values and types, '===' compares values, 'eql?' is not a valid method.

'==' compares values, '===' is not a valid method, 'eql?' compares values and types.

'==' is not a valid method, '===' compares values, 'eql?' compares values and types.

9. What is the purpose of the 'map' method in Ruby?

To define a class

To create a loop

To transform each element of an array and return a new array

To print output

10. In Ruby, how do you define a range from 1 to 10?

(1..10)

[1, 10]

{1-10}

<1, 10>

11. What is the 'splat' operator (*) used for in Ruby?

To multiply two numbers

To concatenate strings

To create an array from a range

To capture an arbitrary number of arguments into an array

12. In Ruby, what does 'nil' represent?

An empty string

An undefined variable

A boolean 'true' value

A lack of a value or absence of an object

13. What does the 'attr_reader' method do in Ruby?

It defines a class

It creates a new object

It generates a getter method for an instance variable

It defines a loop

14. What is the result of '5.times.map { |i| i * 2 }' in Ruby?

[0, 2, 4, 6, 8]

[2, 4, 6, 8, 10]

[10, 8, 6, 4, 2]

[1, 3, 5, 7, 9]

15. In Ruby, what is the purpose of the 'module_function' keyword?

To define a new module

To create a new object

To make module methods accessible as both instance and class methods

To raise an exception

16. What does the 'nil' value represent in Ruby?

A positive integer

A negative integer

A floating-point number

A lack of value or absence of data

17. What is the output of the code 'puts 2 * 3' in Ruby?

2 * 3

2 + 3

18. What is the purpose of the 'each' method in Ruby?

To define a class

To iterate over elements in a collection

To perform string concatenation

To define a method

19. In Ruby, what symbol is used to define a comment that spans multiple lines?

/* */

20. What does the 'private' access modifier do in a Ruby class?

It makes a method accessible from anywhere

It restricts access to the method within the class

It allows access to the method only from subclasses

It defines a public method

21. Which method is used to convert a string to uppercase in Ruby?

to_upper

uppercase

upcase

convert_upper

22. Which operator is used for the logical 'OR' operation in Ruby?

23. What is the symbol used to represent the current object in Ruby?

24. What is the Ruby convention for naming variables?

CamelCase

snake_case

kebab-case

PascalCase

25. What is the purpose of the 'require' keyword in Ruby?

To load a file or library

To define a class

To create an object

To access class attributes

26. In Ruby, what is the purpose of the 'puts' method?

To define a class

To print output to the console with a newline character

To perform mathematical calculations

To read user input

27. What is the purpose of the 'unless' keyword in Ruby?

To define a new class

To create a new object

To execute code when a condition is false

To raise an exception

28. What is the purpose of the 'include' module in Ruby?

To include a file

To include a class

To include a module's methods in a class

To define a method

29. What is the result of 5 + 3 in Ruby?

5 + 3

30. In Ruby, what is a 'block'?

A variable

A piece of code that can be passed to methods

A data structure

A class

31. In Ruby, what is the 'case' statement used for?

To create a class

To define a loop

To perform a conditional switch between multiple values

To print output

32. What is Ruby known for in the world of programming?

Being a compiled language

Being exclusively used for web development

Being an object-oriented scripting language

Being primarily used for game development

33. What is Ruby?

A precious gemstone

A programming language

A popular movie

A type of currency

34. Which operator is used to concatenate two strings in Ruby?

concat

merge

35. What is the Ruby equivalent of 'null' in some other programming languages?

undefined

nil

void

empty

36. What is a Ruby symbol?

A string with special formatting

A unique identifier represented by a name preceded by a colon

A reserved keyword in Ruby

A variable that cannot be reassigned

37. In Ruby, what is the purpose of the 'require' keyword?

To define a method

To include external libraries or modules

To create a class

To loop through an array

38. Which keyword is used to define a conditional statement in Ruby?

then

else

elseif

39. How do you define a method in Ruby?

def my_method

function my_method

method my_method

define my_method

40. In Ruby, what is the 'yield' keyword used for in a method definition?

To define a class

To create a loop

To call a block passed to the method

To print output

41. What is the Ruby convention for naming classes?

CamelCase

snake_case

kebab-case

PascalCase

42. In Ruby, what is the 'elsif' keyword used for in control structures?

To define a method

To create a loop

To specify an alternative condition

To print output

43. Which operator is used for concatenating strings in Ruby?

44. Which of the following is NOT a valid way to define a variable in Ruby?

variable_name = value

@variable_name = value

$variable_name = value

variable name = value

45. Which Ruby operator is used to check if two values are equal in both value and data type?

===

46. What is the purpose of the '__FILE__' constant in Ruby?

To define a new file

To get the current file's name

To access a global variable

To create a new object

47. What does the 'include' module function do in Ruby?

It includes a file in the current directory

It imports methods and constants from a module into a class

It defines a new module

It raises an exception

48. In Ruby, what is the difference between 'puts' and 'print'?

'puts' adds a newline character after the output, 'print' does not.

'puts' is used for printing strings, 'print' is used for printing numbers.

'puts' is used for printing numbers, 'print' is used for printing strings.

There is no difference, 'puts' and 'print' are interchangeable.

49. In Ruby, what is the 'send' method used for?

To send email messages

To invoke a method on an object

To define a class

To create a new object

50. What is the purpose of the 'module' keyword in Ruby?

To define a class

To create a loop

To encapsulate methods and constants

To print output

Ruby MCQ Test 1