Data Types and Variables in R

1.		Which of the following is a valid way to create a data frame in R?

df <- data.frame(1, 2, 3)

df <- data.frame(c(1, 2, 3))

df <- data.frame(x = c(1, 2, 3), y = c("a", "b", "c"))

df <- data.frame(list(1, "a", TRUE))

2.		Which of the following is a valid way to create a list in R?

list <- c(1, "a", TRUE)

list <- list(1, "a", TRUE)

list <- [1, "a", TRUE]

list <- {1, "a", TRUE}

3.		Which of the following is not a basic data type in R?

Integer

Character

Logical

Matrix

4.		What is the maximum length of a vector in R?

2^31-1

2^32-1

2^63-1

There is no maximum length

5.		Which of the following data types is used to represent missing or undefined values in R?

NA

NaN

Inf

#NAME?

6.		Which of the following data types is used to represent positive infinity in R?

NA

NaN

Inf

#NAME?

7.		Which of the following data types is used to represent negative infinity in R?

NA

NaN

Inf

#NAME?

8.		Which of the following functions is used to sort a vector in ascending order in R?

sort()

order()

rank()

aggregate()

9.		Which of the following functions is used to merge two data frames in R based on a common column?

merge()

cbind()

rbind()

bind_rows()

10.		Which of the following functions is used to convert a character variable to a numeric variable in R?

as.numeric()

as.character()

as.logical()

as.factor()