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

1. Which method is used to check if a variable is of a certain class in Ruby?

is_a?

typeof

instanceof

classof

2. 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

3. In Ruby, what is a 'Range' object used for?

To define a sequence of numbers

To represent a collection of objects

To define a regular expression pattern

To define a loop

4. In Ruby, what is the 'singleton class' or 'eigenclass'?

A class that can have only one instance

A class used for defining methods for a single object

A class that is inherited by all other classes

A class that is defined in a separate file

5. What is the purpose of the 'initialize' method in a Ruby class?

To create a new object

To define instance variables

To define a class

To print output

6. 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

7. 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

8. What is the symbol used to define a class variable in Ruby?

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

concat

merge

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

A variable

A piece of code that can be passed to methods

A data structure

A class

11. What is the Ruby convention for naming classes?

CamelCase

snake_case

kebab-case

PascalCase

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

(1..10)

[1, 10]

{1-10}

<1, 10>

13. 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

14. 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

15. 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

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

to_upper

uppercase

upcase

convert_upper

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

2 * 3

2 + 3

18. 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

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

20. 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

21. 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.

22. What is the Ruby convention for naming variables?

CamelCase

snake_case

kebab-case

PascalCase

23. 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]

24. What is the output of the code 'puts true && false' in Ruby?

true

false

true && false

error

25. Who created the Ruby programming language?

Guido van Rossum

Larry Wall

Yukihiro Matsumoto

Linus Torvalds

26. What is a 'Proc' in Ruby?

A built-in data type

A reserved keyword

A block of code that can be assigned to a variable

A way to create objects

27. What does the 'unless' keyword do in Ruby?

It defines a class

It defines a method

It creates an object

It represents a negative condition

28. In Ruby, what does 'self.included(base)' method indicate in a module?

It defines a new module

It raises an exception

It is a placeholder method with no specific purpose

It is called when the module is included in another module or class

29. Which method is used to remove the last element from an array in Ruby?

pop

push

shift

unshift

30. 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

Ruby MCQ Test 3