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Elixir MCQs and Answers with Explanation: Elixir is a dynamic, functional programming language that was first released in 2011. It is built on top of the Erlang Virtual Machine, which is known for its ability to handle large-scale, distributed systems with high concurrency. Elixir is gaining popularity among developers due to its scalability, fault tolerance, and ease of use. It is particularly well-suited for building web applications, real-time systems, and IoT applications. Now, as you are a little familiar with the Elixir concept, you can test your knowledge of this concept through Elixir MCQs with Answers that we have provided in the following section. The Elixir Quiz will help the aspirants know a lot of unknown things about Elixir.
Elixir MCQs with Answers
In this article, we have presented a set of Elixir MCQ Questions and answers related to Elixir, designed to help you test your knowledge of the language and its key features. So, if you are an aspiring Elixir developer or simply curious about this exciting programming language, test your knowledge through Top 62 Elixir Multiple Choice Questions and learn something new about Elixir!
Elixir Multiple Choice Questions
| Name | Elixir |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Top 62 Elixir MCQ Questions and Answers | Practice Elixir Quiz
1. What is the syntax for defining a function in Elixir?
A) function name(argument1, argument2) do
B) def function_name(argument1, argument2) do
C) function_name def(argument1, argument2) do
D) function_name(argument1, argument2) -> do
Answer: B) def function_name(argument1, argument2) do
Explanation: Elixir uses the “def” keyword to define a function followed by the function name and its arguments.
2. What is the purpose of the pipe operator in Elixir?
A) To assign a value to a variable
B) To concatenate strings
C) To chain functions together
D) To declare a module
Answer: C) To chain functions together
Explanation: The pipe operator (|>) allows you to chain functions together and pass the result of one function as an argument to the next.
3. Which data type is used to represent a sequence of characters in Elixir?
A) Integer
B) Float
C) String
D) Boolean
Answer: C) String
Explanation: A string is a sequence of characters enclosed in double quotes in Elixir.
4. What is the syntax for creating a list in Elixir?
A) {1, 2, 3}
B) [1, 2, 3]
C) {1; 2; 3}
D) [1; 2; 3]
Answer: B) [1, 2, 3]
Explanation: A list is created using square brackets [] and elements separated by commas.
5. Which keyword is used to define a module in Elixir?
A) def
B) do
C) module
D) defmodule
Answer: D) defmodule
Explanation: The “defmodule” keyword is used to define a module in Elixir.
6. Which of the following is a valid Elixir atom?
A) ‘hello world’
B) hello world
C) :hello_world
D) “hello_world”
Answer: C) :hello_world
Explanation: An atom is a constant with a name in Elixir and is denoted by a leading colon.
7. What is the purpose of the keyword “do” in Elixir?
A) To define a function
B) To create a block of code
C) To assign a value to a variable
D) To concatenate strings
Answer: B) To create a block of code
Explanation: The “do” keyword is used to create a block of code in Elixir that can be passed as an argument to a function or used in a loop.
8. What is the difference between a tuple and a list in Elixir?
A) Tuples are immutable, while lists are mutable
B) Tuples can only contain atoms, while lists can contain any data type
C) Tuples are enclosed in square brackets, while lists are enclosed in curly braces
D) Tuples are ordered, while lists are unordered
Answer: A) Tuples are immutable, while lists are mutable
Explanation: Tuples cannot be changed once they are created, while lists can be modified using various functions in Elixir.
9. Which function is used to convert a string to an atom in Elixir?
A) to_string
B) to_atom
C) String.to_atom
D) String.to_string
Answer: C) String.to_atom
Explanation: The String.to_atom function is used to convert a string to an atom in Elixir.
10. Which function is used to concatenate two lists in Elixir?
A) concat
B) join
C) merge
D) ++
Answer: D) ++
Explanation: The ++ operator is used to concatenate two lists in Elixir.
11. Which of the following is a valid way to define a module attribute in Elixir?
A) @attribute_name value
B) attribute_name: value
C) attribute_name = value
D) attribute_name value
Answer: A) @attribute_name value
Explanation: A module attribute is defined using the @ symbol followed by the attribute name and its value.
12. Which of the following is an Elixir macro?
A) A function that generates code at compile time
B) A function that generates code at runtime
C) A function that generates documentation
D) A function that generates random numbers
Answer: A) A function that generates code at compile time
Explanation: A macro in Elixir is a function that generates code at compile time and is used to automate repetitive tasks.
13. What is the purpose of the “when” keyword in an Elixir case statement?
A) To define a conditional expression
B) To assign a value to a variable
C) To create a block of code
D) To define a function
Answer: A) To define a conditional expression
Explanation: The “when” keyword is used to define a conditional expression in a case statement in Elixir.
14. Which of the following is an Elixir process identifier?
A) PID
B) ID
C) PROCESS
D) IDENTITY
Answer: A) PID
Explanation: In Elixir, a process identifier is denoted by the abbreviation PID)
15. Which function is used to spawn a new process in Elixir?
A) spawn
B) spawn_link
C) spawn_monitor
D) all of the above
Answer: D) all of the above
Explanation: The spawn, spawn_link, and spawn_monitor functions are all used to spawn a new process in Elixir.
16. Which of the following is a valid Elixir function call?
A) function_name(argument1, argument2)
B) function_name[argument1, argument2]
C) function_name{argument1, argument2}
D) function_name(argument1; argument2)
Answer: A) function_name(argument1, argument2)
Explanation: In Elixir, functions are called using parentheses () and arguments separated by commas.
17. What is the syntax for defining a private function in an Elixir module?
A) defp function_name(argument1, argument2) do
B) def function_name(argument1, argument2) private do
C) def function_name(private) do
D) private def function_name(argument1, argument2) do
Answer: A) defp function_name(argument1, argument2) do
Explanation: A private function in an Elixir module is defined using the “defp” keyword followed by the function name and its arguments.
18. Which of the following is a valid way to access a module attribute in Elixir?
A) @attribute_name
B) attribute_name
C) Module.@attribute_name
D) Module.attribute_name
Answer: A) @attribute_name
Explanation: A module attribute is accessed using the @ symbol followed by the attribute name.
19. Which of the following is a valid Elixir module name?
A) MyModule
B) my_module
C) my-module
D) My-Module
Answer: A) MyModule
Explanation: Elixir module names are typically written in CamelCase.
20. What is the purpose of the “cond” macro in Elixir?
A) To evaluate a series of conditions until one is true
B) To evaluate a single condition
C) To define a block of code
D) To define a function
Answer: A) To evaluate a series of conditions until one is true
Explanation: The “cond” macro in Elixir is used to evaluate a series of conditions until one is true, similar to a switch statement in other programming languages.
21. What is the purpose of the “do/end” block in Elixir?
A) To define a function
B) To define a module
C) To define a block of code
D) To define a process
Answer: C) To define a block of code
Explanation: The “do/end” block in Elixir is used to define a block of code, which can be passed as an argument to a function or macro.
22. Which of the following is a valid way to define a private macro in an Elixir module?
A) defmacro function_name(argument1, argument2) do
B) defp macro function_name(argument1, argument2) do
C) macro function_name(argument1, argument2) private do
D) private defmacro function_name(argument1, argument2) do
Answer: B) defp macro function_name(argument1, argument2) do
Explanation: A private macro in an Elixir module is defined using the “defp” keyword followed by the “macro” keyword, the function name, and its arguments.
23. What is the syntax for defining an Elixir function with default arguments?
A) def function_name(argument1 \ value1, argument2 \ value2) do
B) def function_name(argument1 = value1, argument2 = value2) do
C) def function_name(argument1, value1, argument2, value2) do
D) def function_name(argument1 = value1; argument2 = value2) do
Answer: A) def function_name(argument1 \ value1, argument2 \ value2) do
Explanation: An Elixir function with default arguments is defined using the \ operator to specify the default value for each argument.
24. What is the purpose of the “with” macro in Elixir?
A) To evaluate a series of conditions until one is true
B) To evaluate a single condition
C) To define a block of code
D) To handle a series of nested function calls
Answer: D) To handle a series of nested function calls
Explanation: The “with” macro in Elixir is used to handle a series of nested function calls, where each call depends on the result of the previous call.
25. Which of the following is a valid Elixir type specifier?
A) :atom
B) :list
C) :tuple
D) all of the above
Answer: D) all of the above
Explanation: Elixir type specifiers include :atom, :list, :tuple, and many others.
26. What is the purpose of the “Enum” module in Elixir?
A) To provide functions for working with enumerables
B) To provide functions for working with atoms
C) To provide functions for working with lists
D) To provide functions for working with processes
Answer: A) To provide functions for working with enumerables
Explanation: The “Enum” module in Elixir provides a set of functions for working with enumerables, such as lists, maps, and ranges.
27. Which of the following is a valid Elixir list comprehension?
A) [x | x in [1, 2, 3] if x > 0]
B) [x in [1, 2, 3] if x > 0 | x]
C) [x | x > 0 in [1, 2, 3]]
D) [x in [1, 2, 3] | x if x > 0]
Answer: A) [x | x in [1, 2, 3] if x > 0]
Explanation: An Elixir list comprehension is defined using the syntax [expression | generator, condition], where the generator produces a list of values and the condition filters those values.
28. What is the purpose of the “Kernel” module in Elixir?
A) To provide functions for working with the Elixir language
B) To provide functions for working with the Erlang runtime
C) To provide functions for working with the file system
D) To provide functions for working with the network
Answer: A) To provide functions for working with the Elixir language
Explanation: The “Kernel” module in Elixir provides a set of functions for working with the Elixir language itself, such as defining functions and modules, accessing module attributes, and raising exceptions.
29. What is the syntax for defining an anonymous function in Elixir?
A) fn (argument1, argument2) -> expression end
B) fun (argument1, argument2) -> expression end
C) anon (argument1, argument2) -> expression end
D) anonymous (argument1, argument2) -> expression end
Answer: A) fn (argument1, argument2) -> expression end
Explanation: An anonymous function in Elixir is defined using the fn keyword, followed by its arguments and the expression to be evaluateD)
30. What is the purpose of the “Kernel.SpecialForms” module in Elixir?
A) To provide special forms that cannot be defined as macros
B) To provide special forms that are only used in specific contexts
C) To provide special forms that are used to define macros
D) To provide special forms that are used to define functions
Answer: A) To provide special forms that cannot be defined as macros
Explanation: The “Kernel.SpecialForms” module in Elixir provides a set of special forms that cannot be defined as macros, such as “def”, “defmodule”, and “if”.
31. What is the purpose of the “Enum.reduce” function in Elixir?
A) To apply a function to each element of an enumerable and return the accumulated result
B) To remove elements from an enumerable that do not match a given condition
C) To sort the elements of an enumerable according to a given criterion
D) To group the elements of an enumerable into sublists
Answer: A) To apply a function to each element of an enumerable and return the accumulated result
Explanation: The “Enum.reduce” function in Elixir is used to apply a function to each element of an enumerable, accumulating the result and returning the final value.
32. Which of the following is a valid way to define a private function in an Elixir module?
A) def function_name(argument1, argument2) do
B) defp function_name(argument1, argument2) do
C) function_name(argument1, argument2) private do
D) private def function_name(argument1, argument2) do
Answer: B) defp function_name(argument1, argument2) do
Explanation: A private function in an Elixir module is defined using the “defp” keyword followed by the function name and its arguments.
33. Which of the following is a valid way to pattern match on a tuple in Elixir?
A) {a, b} = {1, 2, 3}
B) [a, b] = {1, 2}
C) {a, b} = [1, 2]
D) [a, b] = [1, 2, 3]
Answer: A) {a, b} = {1, 2, 3}
Explanation: Pattern matching on a tuple in Elixir is done by specifying the tuple structure and variable names to bind the tuple elements to.
34. Which of the following is true about the “IO.puts” function in Elixir?
A) It writes a binary to a file.
B) It writes a string to standard output.
C) It reads a line from standard input.
D) It reads a binary from a file.
Answer: B) It writes a string to standard output.
Explanation: The “IO.puts” function in Elixir is used to write a string to standard output.
35. What is the purpose of the “Enum.map” function in Elixir?
A) To transform each element of an enumerable using a function and return the resulting enumerable
B) To remove elements from an enumerable that do not match a given condition
C) To sort the elements of an enumerable according to a given criterion
D) To group the elements of an enumerable into sublists
Answer: A) To transform each element of an enumerable using a function and return the resulting enumerable
Explanation: The “Enum.map” function in Elixir is used to apply a function to each element of an enumerable, returning a new enumerable with the transformed elements.
36. Which of the following is true about the “Enum.each” function in Elixir?
A) It applies a function to each element of an enumerable and returns the resulting enumerable.
B) It removes elements from an enumerable that do not match a given condition.
C) It sorts the elements of an enumerable according to a given criterion.
D) It iterates over the elements of an enumerable, applying a function to each element.
Answer: D) It iterates over the elements of an enumerable, applying a function to each element.
Explanation: The “Enum.each” function in Elixir is used to iterate over the elements of an enumerable and apply a function to each element, but it does not return the resulting enumerable.
37. What is the purpose of the “String.split” function in Elixir?
A) To split a string into substrings based on a separator.
B) To concatenate multiple strings into a single string.
C) To trim whitespace from the beginning and end of a string.
D) To replace substrings in a string with other substrings.
Answer: A) To split a string into substrings based on a separator.
Explanation: The “String.split” function in Elixir is used to split a string into substrings based on a specified separator.
38. Which of the following is a valid way to access the second element of a list in Elixir?
A) list[1]
B) list[2]
C) Enum.at(list, 1)
D) Enum.at(list, 2)
Answer: C) Enum.at(list, 1)
Explanation: In Elixir, list indexing starts from 0, so the second element of a list can be accessed using “Enum.at(list, 1)”.
39. Which of the following is true about the “Kernel.spawn” function in Elixir?
A) It starts a new process that runs a given function.
B) It terminates the current process.
C) It sends a message to another process.
D) It receives a message from another process.
Answer: A) It starts a new process that runs a given function.
Explanation: The “Kernel.spawn” function in Elixir is used to start a new process that runs the specified function.
40. What is the purpose of the “Kernel.send” function in Elixir?
A) To start a new process that runs a given function.
B) To terminate the current process.
C) To send a message to another process.
D) To receive a message from another process.
Answer: C) To send a message to another process.
Explanation: The “Kernel.send” function in Elixir is used to send a message to another process.
41. Which of the following is true about the “Kernel.receive” function in Elixir?
A) It starts a new process that runs a given function.
B) It terminates the current process.
C) It sends a message to another process.
D) It receives a message from another process.
Answer: D) It receives a message from another process.
Explanation: The “Kernel.receive” function in Elixir is used to receive a message from another process.
42. Which of the following is true about the “Enum.filter” function in Elixir?
A) It transforms each element of an enumerable using a function and returns the resulting enumerable.
B) It removes elements from an enumerable that do not match a given condition.
C) It sorts the elements of an enumerable according to a given criterion.
D) It groups the elements of an enumerable into sublists.
Answer: B) It removes elements from an enumerable that do not match a given condition.
Explanation: The “Enum.filter” function in Elixir is used to filter out elements from an enumerable that do not match a given condition.
43. What is the purpose of the “Kernel.defp” function in Elixir?
A) To define a public function.
B) To define a private function.
C) To define a macro.
D) To define a struct.
Answer: B) To define a private function.
Explanation: The “Kernel.defp” function in Elixir is used to define a private function that can only be called from within the module in which it is defineD)
44. What is the purpose of the “Enum.reverse” function in Elixir?
A) To reverse the order of the elements in an enumerable.
B) To transform each element of an enumerable using a function and return the resulting enumerable.
C) To remove elements from an enumerable that do not match a given condition.
D) To sort the elements of an enumerable according to a given criterion.
Answer: A) To reverse the order of the elements in an enumerable.
Explanation: The “Enum.reverse” function in Elixir is used to reverse the order of the elements in an enumerable.
45. What is the purpose of the “Kernel.SpecialForms.import” function in Elixir?
A) To include another module in the current module.
B) To define a struct.
C) To define a private function.
D) To define a public function.
Answer: A) To include another module in the current module.
Explanation: The “Kernel.SpecialForms.import” function in Elixir is used to include another module in the current module, making its functions and macros available to the current module.
46. Which of the following is a valid way to define a macro in Elixir?
A) @macro defmacro, do: …
B) defmacro @macro, do: …
C) defmacro macro_name, do: …
D) macro macro_name, do: …
Answer: C) defmacro macro_name, do: …
Explanation: In Elixir, a macro can be defined using the “defmacro” keyword followed by the macro name and its implementation.
47. Which of the following is true about the “Kernel.spawn_link” function in Elixir?
A) It starts a new process that runs a given function.
B) It terminates the current process.
C) It sends a message to another process.
D) It links the current process to a new process that runs a given function.
Answer: D) It links the current process to a new process that runs a given function.
Explanation: The “Kernel.spawn_link” function in Elixir is used to start a new process that runs the specified function and link the current process to it.
48. What is the purpose of the “Kernel.self” function in Elixir?
A) To send a message to the current process.
B) To receive a message from the current process.
C) To get the process identifier of the current process.
D) To terminate the current process.
Answer: C) To get the process identifier of the current process.
Explanation: The “Kernel.self” function in Elixir is used to get the process identifier of the current process.
49. Which of the following is true about the “Kernel.put_elem” function in Elixir?
A) It returns a new enumerable with a modified element at a given index.
B) It removes the element at a given index from an enumerable.
C) It inserts a new element at a given index in an enumerable.
D) It updates the value of an element at a given index in a data structure.
Answer: D) It updates the value of an element at a given index in a data structure.
Explanation: The “Kernel.put_elem” function in Elixir is used to update the value of an element at a given index in a data structure.
50. What is the purpose of the “Kernel.exit” function in Elixir?
A) To start a new process that runs a given function.
B) To terminate the current process.
C) To send a message to another process.
D) To terminate another process.
Answer: B) To terminate the current process.
Explanation: The “Kernel.exit” function in Elixir is used to terminate the current process.
51. Which of the following is true about the “Kernel.spawn_monitor” function in Elixir?
A) It starts a new process that runs a given function.
B) It terminates the current process.
C) It sends a message to another process.
D) It monitors a new process that runs a given function.
Answer: D) It monitors a new process that runs a given function.
Explanation: The “Kernel.spawn_monitor” function in Elixir is used to start a new process that runs the specified function and monitor it, which means that the current process will receive a message if the monitored process terminates.
52. Which of the following is true about the “Enum.take” function in Elixir?
A) It returns the first element of an enumerable.
B) It returns the last element of an enumerable.
C) It returns the first n elements of an enumerable.
D) It returns the last n elements of an enumerable.
Answer: C) It returns the first n elements of an enumerable.
Explanation: The “Enum.take” function in Elixir is used to return the first n elements of an enumerable.
53. Which of the following is true about Elixir’s string data type?
A) Strings in Elixir are mutable.
B) Strings in Elixir are represented using double quotes.
C) Strings in Elixir can contain Unicode characters.
D) Strings in Elixir can only contain ASCII characters.
Answer: C) Strings in Elixir can contain Unicode characters.
Explanation: Elixir’s string data type can contain Unicode characters, not just ASCII characters.
54. Which of the following is true about Elixir’s keyword lists?
A) They are similar to Elixir’s maps.
B) They are ordered lists of key-value pairs.
C) They can contain duplicate keys.
D) They are represented using square brackets.
Answer: B) They are ordered lists of key-value pairs.
Explanation: Elixir’s keyword lists are ordered lists of key-value pairs, and are commonly used to represent options for functions.
55. Which of the following is true about the “Enum.group_by” function in Elixir?
A) It groups the elements of an enumerable into sub-enumerables according to a given criterion.
B) It returns the elements of an enumerable in reverse order.
C) It removes elements from an enumerable that do not match a given condition.
D) It sorts the elements of an enumerable according to a given criterion.
Answer: A) It groups the elements of an enumerable into sub-enumerables according to a given criterion.
Explanation: The “Enum.group_by” function in Elixir is used to group the elements of an enumerable into sub-enumerables according to a given criterion.
56. Which of the following is true about Elixir’s anonymous functions?
A) They are defined using the “def” keyworD)
B) They can be passed as arguments to other functions.
C) They can only be called from the same module in which they are defineD)
D) They cannot have more than one parameter.
Answer: B) They can be passed as arguments to other functions.
Explanation: Elixir’s anonymous functions can be passed as arguments to other functions, allowing for higher-order programming.
57. Which of the following is true about Elixir’s “Enum.reduce_while” function?
A) It applies a function to each element of an enumerable and returns the first element that matches a condition.
B) It applies a function to each element of an enumerable and returns the result of the last application.
C) It applies a function to each element of an enumerable and stops iterating when a condition is met.
D) It applies a function to each element of an enumerable and returns a new enumerable with the results.
Answer: C) It applies a function to each element of an enumerable and stops iterating when a condition is met.
Explanation: The “Enum.reduce_while” function in Elixir applies a function to each element of an enumerable and stops iterating when a condition is met, returning a tuple with the accumulated value and the reason for stopping.
58. Which of the following is true about Elixir’s “defmodule” macro?
A) It is used to define a new module.
B) It is used to define a new function.
C) It is used to define a new macro.
D) It is used to define a new data type.
Answer: A) It is used to define a new module.
Explanation: The “defmodule” macro in Elixir is used to define a new module.
59. Which of the following is true about Elixir’s “Kernel.SpecialForms.import” function?
A) It is used to import functions from other modules.
B) It is used to define new macros.
C) It is used to define new data types.
D) It is used to define new modules.
Answer: A) It is used to import functions from other modules.
Explanation: The “Kernel.SpecialForms.import” function in Elixir is used to import functions from other modules, allowing them to be called without fully qualifying the module name.
60. Which of the following is true about Elixir’s “Kernel.SpecialForms.alias” macro?
A) It is used to define new modules.
B) It is used to define new macros.
C) It is used to create an alias for a module.
D) It is used to import functions from other modules.
Answer: C) It is used to create an alias for a module.
Explanation: The “Kernel.SpecialForms.alias” macro in Elixir is used to create an alias for a module, allowing it to be referred to by a shorter name.
61. Which of the following is true about Elixir’s “Kernel.SpecialForms.require” function?
A) It is used to define new modules.
B) It is used to import functions from other modules.
C) It is used to load code from a file.
D) It is used to create an alias for a module.
Answer: C) It is used to load code from a file.
Explanation: The “Kernel.SpecialForms.require” function in Elixir is used to load code from a file, making it available for use in the current module.
62. Which of the following is true about Elixir’s “Enum.map_reduce” function?
A) It applies a function to each element of an enumerable and returns the result of the last application.
B) It applies a function to each element of an enumerable and returns a new enumerable with the results.
C) It applies a function to each element of an enumerable and returns a tuple with the accumulated value and the results.
D) It applies a function to each element of an enumerable and stops iterating when a condition is met.
Answer: C) It applies a function to each element of an enumerable and returns a tuple with the accumulated value and the results.
Explanation: The “Enum.map_reduce” function in Elixir applies a function to each element of an enumerable and returns a tuple with the accumulated value and the results
Elixir is a powerful and versatile programming language that offers developers the ability to build robust, distributed systems with ease. By testing your knowledge with the Elixir MCQ questions presented here, you can gain a better understanding of the language’s key features and capabilities, taking the first step towards becoming an accomplished Elixir developer. For more software-related quiz articles, keep checking our Freshersnow website frequently.