MCQs on Input and Output | Ruby

Master the key concepts of input and output operations in Ruby, covering reading and writing to the console, and working with files. These 30 multiple-choice questions will help you understand these essential Ruby features.

Reading from and Writing to the Console

1. Which method in Ruby is used to print a message to the console?
   • A) puts
   • B) print
   • C) get
   • D) output
2. How can you read user input from the console in Ruby?
   • A) gets
   • B) input
   • C) read
   • D) input_data
3. Which of the following methods prints data without adding a newline at the end?
   • A) puts
   • B) print
   • C) write
   • D) echo
4. What will the following Ruby code snippet output? name = gets.chomp puts "Hello, #{name}"
   • A) It will print the value of ‘name’
   • B) It will print “Hello, name”
   • C) It will print “Hello,” and wait for input
   • D) It will print “Hello, ” followed by the user’s input
5. Which method is used to remove the trailing newline character from user input in Ruby?
   • A) strip
   • B) chomp
   • C) trim
   • D) clean
6. How do you read a single character of input in Ruby?
   • A) gets_char
   • B) gets.chomp
   • C) getc
   • D) input_char
7. What is the difference between the puts and print methods in Ruby?
   • A) puts adds a newline, print does not
   • B) puts prints without formatting, print formats output
   • C) puts prints on the same line, print moves to a new line
   • D) There is no difference
8. How do you print a formatted string with interpolation in Ruby?
   • A) printf “Hello, #{name}”
   • B) puts “Hello, name”
   • C) print “Hello, #name”
   • D) puts “Hello, #{name}”
9. What will the following code snippet print? age = 30 puts "You are #{age} years old"
   • A) You are 30 years old
   • B) You are age years old
   • C) You are #{age} years old
   • D) It will throw an error
10. Which method is used to clear the console output in Ruby?
    • A) clear
    • B) cls
    • C) system(‘clear’)
    • D) reset

Working with Files

11. How do you open a file for reading in Ruby?
    • A) File.read(“file.txt”)
    • B) File.open(“file.txt”, “r”)
    • C) File.read(“file”)
    • D) File.open(“file”, “r”)
12. What method do you use to write content to a file in Ruby?
    • A) File.write
    • B) File.print
    • C) File.puts
    • D) File.open
13. Which Ruby method is used to close an open file?
    • A) close_file
    • B) close
    • C) file.close
    • D) end
14. What will happen if you try to open a file for writing with File.open("file.txt", "w") when the file does not exist?
    • A) Ruby will raise an error
    • B) The file will be created and opened for writing
    • C) The file will be created but opened for reading
    • D) The file will not be created and nothing will happen
15. How do you append data to a file in Ruby?
    • A) File.open(“file.txt”, “w”)
    • B) File.open(“file.txt”, “a”)
    • C) File.append(“file.txt”)
    • D) File.write(“file.txt”)
16. What will the following code do? File.open("example.txt", "r") do |file| file.each_line { |line| puts line } end
    • A) Read and print each line of the file
    • B) Open the file for writing
    • C) Write each line to a new file
    • D) Read the first line of the file
17. How can you read the entire content of a file as a string in Ruby?
    • A) File.read(“file.txt”)
    • B) File.open(“file.txt”)
    • C) File.read_all(“file.txt”)
    • D) File.readlines(“file.txt”)
18. What is the purpose of the w mode in the File.open method?
    • A) It opens the file for writing, creating a new file if it doesn’t exist
    • B) It opens the file for reading and writing
    • C) It opens the file in binary mode
    • D) It opens the file for reading only
19. Which method allows you to read a file line by line in Ruby?
    • A) File.each_line
    • B) File.read
    • C) File.readlines
    • D) File.lines
20. What will the following code output? File.open("file.txt", "w") do |file| file.puts "Hello, World!" end
    • A) It will print “Hello, World!” to the console
    • B) It will create a file called “file.txt” and write “Hello, World!” to it
    • C) It will read the contents of “file.txt”
    • D) It will throw an error
21. Which Ruby method is used to check if a file exists?
    • A) File.exist?
    • B) File.exists?
    • C) File.check
    • D) File.open?
22. What does the r mode do when opening a file in Ruby?
    • A) Opens the file for reading only
    • B) Opens the file for reading and writing
    • C) Opens the file for writing
    • D) Opens the file for appending
23. Which Ruby class is used to handle file paths?
    • A) File
    • B) Path
    • C) Pathname
    • D) Directory
24. How do you check if a file is empty in Ruby?
    • A) File.empty?
    • B) File.size == 0
    • C) File.read.empty?
    • D) File.exists?
25. Which method would you use to delete a file in Ruby?
    • A) File.delete
    • B) File.remove
    • C) File.delete_file
    • D) File.erase
26. What is the default mode when opening a file in Ruby using File.open("file.txt")?
    • A) “r”
    • B) “w”
    • C) “a”
    • D) “rw”
27. What is the result of the following Ruby code? File.open("file.txt", "r") { |file| puts file.read(5) }
    • A) It prints the first 5 bytes of the file
    • B) It reads the entire file
    • C) It prints the entire content of the file
    • D) It throws an error
28. How do you handle errors when working with files in Ruby?
    • A) Using rescue
    • B) Using try
    • C) Using handle
    • D) Using catch
29. Which method would you use to read a file line by line in Ruby, while also returning an array of lines?
    • A) File.readlines
    • B) File.open
    • C) File.each_line
    • D) File.readlines
30. What will happen if you attempt to open a file in Ruby using an invalid path?
    • A) Ruby will raise an error
    • B) The program will continue without opening the file
    • C) It will return nil
    • D) It will create the file at the invalid path

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