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What is the purpose of the str() function in R? a) Converts a value to a string b) Extracts a substring c) Displays the internal structure of an object d) Joins two strings together Answer: c) Displays the internal structure of an object Explanation: The str() function in R displays the internal structure of an […]

What does the rep() function do in R? a) Repeats a value or vector b) Returns the average of a vector c) Removes duplicates from a vector d) Returns the reverse of a vector Answer: a) Repeats a value or vector Explanation: The rep() function repeats a value or a vector a specified number of

How can you pass multiple arguments to a function in R? a) Using a list b) Using the c() function c) Passing them as individual parameters d) Using a matrix Answer: c) Passing them as individual parameters Explanation: Multiple arguments are passed to a function by specifying them individually, separated by commas, in the function

What does the sum() function do in R? a) Finds the average of numbers b) Finds the sum of numbers c) Finds the difference between numbers d) None of the above Answer: b) Finds the sum of numbers Explanation: The sum() function in R returns the total sum of all the elements in a vector.

How do you define a function with a default argument in R? a) function_name <- function(x = 5) b) function_name <- function(x <- 5) c) function_name <- def(x = 5) d) func function_name(x = 5) Answer: a) function_name <- function(x = 5) Explanation: In R, a default argument is set using the syntax function_name <-

What is the output of mean(c(2, 4, 6))? a) 4 b) 6 c) 2 d) 5 Answer: a) 4 Explanation: The mean() function calculates the average of a numeric vector. The mean of c(2, 4, 6) is 4. Reference: R Programming – Functions MCQ Questions and Answers

What does the return() function do in R? a) Ends a function and returns a value b) Prints a message c) Stops a script d) None of the above Answer: a) Ends a function and returns a value Explanation: The return() function in R is used to return a value from a function and end

Which function in R returns the number of rows in a data frame? a) ncol() b) length() c) nrow() d) count() Answer: c) nrow() Explanation: The nrow() function returns the number of rows in a data frame or matrix. Reference: R Programming – Functions MCQ Questions and Answers

How do you call a function in R? a) call function_name() b) function_name() c) run function_name() d) execute function_name() Answer: b) function_name() Explanation: To call a function in R, you simply use the syntax function_name(). Reference: R Programming – Functions MCQ Questions and Answers

How do you define a function in R? a) function_name <- function() b) function function_name() c) def function_name() d) func function_name() Answer: a) function_name <- function() Explanation: In R, a function is defined using the syntax function_name <- function(), where function() contains the function logic. Reference: R Programming – Functions MCQ Questions and Answers

Which operator is used to check if a value is less than or equal to another value in R? a) < b) == c) <= d) >= Answer: c) <= Explanation: The <= operator checks if a value is less than or equal to another value in R. Reference: R Programming – Operators MCQ Questions

What does the operator ! do in R? a) Negates a logical value b) Performs logical AND c) Multiplies two numbers d) Divides two numbers Answer: a) Negates a logical value Explanation: The ! operator in R is a logical negation operator, reversing the logical value. Reference: R Programming – Operators MCQ Questions and Answers

What is the result of the expression 6 %/% 4 in R? a) 2 b) 1 c) 3 d) 4 Answer: b) 1 Explanation: The %/% operator performs integer division, so 6 %/% 4 results in 1 (as the remainder is discarded). Reference: R Programming – Operators MCQ Questions and Answers

How do you assign a value to a variable in R? a) == b) = c) ← d) → Answer: c) ← Explanation: The ← operator is the most common way to assign a value to a variable in R. Reference: R Programming – Operators MCQ Questions and Answers

Which of the following is the correct operator for integer division in R? a) %/% b) %% c) // d) ˆ Answer: a) %/% Explanation: The %/% operator in R performs integer division, returning the quotient of the division. Reference: R Programming – Operators MCQ Questions and Answers

What is the difference between && and & in R? a) Both are the same b) && is for element-wise comparison, and & is for logical AND c) & is for element-wise comparison, and && is for logical AND d) && is faster than & Answer: c) & is for element-wise comparison, and && is

What does the operator || do in R? a) Logical OR with element-wise comparison b) Logical AND c) Logical OR with short-circuiting d) Logical XOR Answer: c) Logical OR with short-circuiting Explanation: The || operator is a logical OR operator in R with short-circuiting, meaning it evaluates only the first element of the condition. Reference:

What is the result of 3ˆ2 in R? a) 9 b) 6 c) 8 d) 12 Answer: a) 9 Explanation: The ˆ operator raises 3 to the power of 2, resulting in 9. Reference: R Programming – Operators MCQ Questions and Answers

What does the %% operator do in R? a) Integer division b) Modulus (remainder) c) Exponentiation d) Multiplication Answer: b) Modulus (remainder) Explanation: The %% operator returns the remainder of the division in R. Reference: R Programming – Operators MCQ Questions and Answers

Which of the following is a logical operator in R? a) * b) | c) == d) %/% Answer: b) | Explanation: The | operator is a logical operator used for OR operations in R. Reference: R Programming – Operators MCQ Questions and Answers

How do you check if two variables are not equal in R? a) != b) == c) | d) && Answer: a) != Explanation: The != operator checks if two variables are not equal in R. Reference: R Programming – Operators MCQ Questions and Answers

Which operator is used to raise a number to a power in R? a) ˆ b) %/% c) * d) + Answer: a) ˆ Explanation: The ˆ operator is used in R to raise a number to the power of another number. Reference: R Programming – Operators MCQ Questions and Answers

What is the result of the expression 5 %% 2 in R? a) 1 b) 0 c) 2 d) 5 Answer: a) 1 Explanation: The %% operator returns the remainder of the division, so 5 %% 2 equals 1. Reference: R Programming – Operators MCQ Questions and Answers

Which of the following is a relational operator in R? a) + b) == c) %% d) ˆ Answer: b) == Explanation: The == operator checks if two values are equal, making it a relational operator in R. Reference: R Programming – Operators MCQ Questions and Answers

Which of the following is an arithmetic operator in R? a) == b) * c) && d) | Answer: b) * Explanation: The * operator is used for multiplication, which is an arithmetic operation in R. Reference: R Programming – Operators MCQ Questions and Answers