Data Types and Variables in R

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

2^31-1

2^32-1

2^63-1

There is no maximum length

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

NA

NaN

Inf

#NAME?

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

NA

NaN

Inf

#NAME?

4.		Which of the following functions is used to check the data type of a variable in R?

typeof()

class()

str()

summary()

5.		Which of the following data types is used to represent a collection of objects of different types in R?

Vector

List

Data frame

Array

6.		Which of the following functions is used to remove missing values from a vector in R?

na.omit()

complete.cases()

is.na()

drop_na()

7.		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))

8.		What is the default data type of a variable in R?

Numeric

Integer

Character

Logical

9.		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()

10.		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}