Data Types And Variables In Ruby MCQs with Explanations

Question: What is the output of the expression: "5" + "2" in Ruby? Explanation: In Ruby, when you use the "+" operator with strings (text enclosed in double quotes), it performs string concatenation , not mathematical addition. This means it joins the two strings together. So, "5" + "2" combines "5" and "2" to create the new string "52". Therefore, the correct answer is Option C: 52 Important Note: If you wanted to perform mathematical addition, you would need to use numbers without quotes, like 5 + 2, which would result in 7. But in this case, because the inputs are strings, Ruby treats the "+" as a string concatenation operator.

Float is the correct answer to “What is the data type of the value 3.14 in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

nil is the correct answer to “What is the default value of a variable in Ruby if not initialized”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

@ is the correct answer to “Which symbol is used to declare a variable in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

Null value is the correct answer to “What does the 'nil' value represent in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.to_i is the correct answer to “What is the method used to convert a string to an integer in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.to_f is the correct answer to “What is the method used to convert a string to a float in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

Boolean is the correct answer to “What is the data type of the value true in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.to_s is the correct answer to “What is the method used to convert a value to string in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

2 is the correct answer to “What is the result of the expression: 5 / 2 in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

CONSTANT_NAME = value is the correct answer to “Which of the following is the correct way to declare a constant in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.nil? is the correct answer to “Which method is used to check if a variable is nil in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.class is the correct answer to “What is the method used to check the data type of a variable in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.defined? is the correct answer to “What is the method used to check if a variable is defined in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

variable_name = value is the correct answer to “What is the correct syntax to declare and initialize a variable in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

myVar = 10 is the correct answer to “Which of the following is a valid way to declare a variable in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

String is the correct answer to “What is the data type of the value "Hello, World" in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.empty? is the correct answer to “What is the method used to check if a variable is empty in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

str1 + str2 is the correct answer to “What is the correct way to concatenate two strings in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

7 is the correct answer to “What is the output of the expression: "5".to_i + 2 in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

var_name is the correct answer to “What is the correct way to declare a variable in Ruby without assigning a value”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.downcase is the correct answer to “What is the method used to convert a string to lowercase in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

var_name = value is the correct answer to “Which of the following is the correct way to declare a variable in Ruby with a default value”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.is_numeric? is the correct answer to “What is the method used to check if a variable is numeric in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

"101010" is the correct answer to “What is the output of the expression: "10" * 3 in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.chars is the correct answer to “Which method is used to convert a string to an array of characters in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.is_a? is the correct answer to “What is the method used to check if a variable is of a specific class in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

var_name = value is the correct answer to “Which of the following is the correct way to define a variable in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.include? is the correct answer to “What is the method used to check if a string contains a specific substring in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

1 is the correct answer to “What is the result of the expression: 10 % 3 in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

constantName(value) is the correct answer to “In Ruby, what is the keyword used to define a constant”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

(1..10) is the correct answer to “Which of the following is the correct way to define a range in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

Exits the method with a value is the correct answer to “What does the 'return' keyword do in Ruby methods”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

array_name = [] is the correct answer to “What is the correct way to declare and initialize an array in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.rb is the correct answer to “In Ruby, what is the default file extension for Ruby files”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

Removes trailing whitespace is the correct answer to “What does the 'chomp' method do in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

''' ... ''' is the correct answer to “What is the correct syntax for a multiline comment in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

.length is the correct answer to “Which method is used to find the length of an array in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

3 is the correct answer to “What is the output of the expression: 7 / 2 in Ruby”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.

until is the correct answer to “In Ruby, what is the keyword used to define a loop that repeats until a condition is true”. This question is standard in competitive examination syllabi for Data Types And Variables In Ruby.