Best Ruby Test - 93+ MCQs: Ruby test: Evaluate Your Programming Skills with Ruby Questions and Answers

1. 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

2. What is the purpose of the 'begin' and 'rescue' keywords in Ruby?

To define a new class

To handle exceptions and errors

To create an array

To define a loop

3. Which method is used to iterate over each element of an array in Ruby?

for loop

each

iterate

loop

4. What is Ruby primarily known for?

Web development

Data analysis

Artificial intelligence

Game development

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

undefined

nil

void

empty

6. 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

7. 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

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

is_a?

instance_of?

typeof

class_of

11.

12. 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

13. What is the Ruby operator for exponentiation?

14. 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

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

16. 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

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

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 is the 'self' keyword used for?

To reference the current object

To define a class

To create a new object

To access class attributes

20. 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

21. 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

22. 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

23. In Ruby, what does 'attr_accessor' do?

It defines a class method

It creates getter and setter methods for class variables

It defines a class constant

It defines an instance method

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

to_upper

uppercase

upcase

convert_upper

25. 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

26. 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.

27. 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

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

29. What is the Ruby operator for equality?

===

30. What does the 'super' keyword do in Ruby?

It defines a superclass for a class

It calls the superclass's implementation of the current method

It creates an instance of a class

It raises an exception

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

5 + 3

32. What is the purpose of the 'attr_accessor' keyword in Ruby?

To define a class

To access class attributes

To create a new object

To define a method

33. Which Ruby data structure is similar to an array but allows you to associate values with keys?

Array

Hash

String

Symbol

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

2 * 3

2 + 3

35. 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

36. 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

37. In Ruby, what is the purpose of the 'next' keyword within a loop?

To exit the loop

To skip the current iteration and continue to the next

To restart the loop

To print output

38. What is the purpose of the 'throw' and 'catch' keywords in Ruby?

To create a new class

To handle exceptions and errors

To define a loop

To define a module

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

(1..10)

[1, 10]

{1-10}

<1, 10>

40. In Ruby, what is an 'if' statement used for?

Defining a method

Looping through an array

Conditional execution of code

Creating a class

Ruby MCQ Test 2