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

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

concat

merge

2. 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

3. What is the purpose of the 'retry' keyword in Ruby?

To define a loop

To create a new object

To raise an exception

To restart a block of code from the beginning

4. How do you define a method in Ruby?

def my_method

function my_method

method my_method

define my_method

5. Which Ruby data structure is similar to an array but can contain only unique values?

List

Hash

Set

Tuple

6. What is Ruby?

A precious gemstone

A programming language

A popular movie

A type of currency

7. 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

8. 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

9. 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

10. 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

11. 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

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

then

else

elseif

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

is_a?

typeof

instanceof

classof

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

(1..10)

[1, 10]

{1-10}

<1, 10>

15. 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.

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

Defining a method

Looping through an array

Conditional execution of code

Creating a class

17. Who created the Ruby programming language?

Guido van Rossum

Larry Wall

Yukihiro Matsumoto

Linus Torvalds

18. 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

19. What is the Ruby operator for equality?

===

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

21.

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

to_upper

uppercase

upcase

convert_upper

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

true

false

true && false

error

24. 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]

25. What is the Ruby convention for naming classes?

CamelCase

snake_case

kebab-case

PascalCase

26.

27. 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

28. 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

29. What is Ruby primarily known for?

Web development

Data analysis

Artificial intelligence

Game development

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

Ruby MCQ Test 3