R Programming MCQ Questions with answers and solutions Page 41

Q. In R, how do you create a list named my_list with three elements: 1, "hello", and TRUE?

(A) my_list <- c(1, "hello", TRUE)
(B) my_list = list(1, "hello", TRUE)
(C) my_list(1, "hello", TRUE)
(D) list(my_list = c(1, "hello", TRUE))

💬 Discuss

✅ Correct Answer: (B) my_list = list(1, "hello", TRUE)

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:11 am in R Programming

Q. What is the primary data structure used for storing tabular data in R?

(A) List
(B) Matrix
(C) Data Frame
(D) Array

💬 Discuss

✅ Correct Answer: (C) Data Frame

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:11 am in R Programming

Q. How is a vector different from a list in R?

(A) Vectors can only store numeric values
(B) Lists can store elements of different types
(C) Lists can only store characters
(D) Vectors can store elements of different types

💬 Discuss

✅ Correct Answer: (D) Vectors can store elements of different types

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:11 am in R Programming

Q. In R, how is a matrix initialized with values 1 to 9 arranged in three rows?

(A) matrix(1:9, nrow = 3, ncol = 3)
(B) matrix(c(1, 2, 3, 4, 5, 6, 7, 8, 9), 3, 3)
(C) matrix(1:9, rows = 3, cols = 3)
(D) mat(1:9, 3, 3)

💬 Discuss

✅ Correct Answer: (A) matrix(1:9, nrow = 3, ncol = 3)

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:11 am in R Programming

Q. How do you create a factor in R named color with levels "red", "green", and "blue"?

(A) factor(color, levels = c("red", "green", "blue"))
(B) factor(color, levels = "red", "green", "blue")
(C) factor(color = c("red", "green", "blue"))
(D) factor(color = c("red", "green", "blue"), levels = c("red", "green", "blue"))

💬 Discuss

✅ Correct Answer: (D) factor(color = c("red", "green", "blue"), levels = c("red", "green", "blue"))

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:11 am in R Programming

Q. What is the purpose of the data.frame() function in R?

(A) Create a vector
(B) Create a data frame
(C) Create a matrix
(D) Create a list

💬 Discuss

✅ Correct Answer: (B) Create a data frame

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:11 am in R Programming

Q. In R, how do you create a named list with elements "apple", "orange", and "banana"?

(A) list("apple", "orange", "banana")
(B) named_list(c("apple", "orange", "banana"))
(C) list(c("apple", "orange", "banana"))
(D) list(elements = c("apple", "orange", "banana"))

💬 Discuss

✅ Correct Answer: (D) list(elements = c("apple", "orange", "banana"))

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:11 am in R Programming

Q. What is the correct way to access the second element of a vector named my_vector in R?

(A) my_vector(2)
(B) my_vector[2]
(C) my_vector.2
(D) my_vector[[2]]

💬 Discuss

✅ Correct Answer: (B) my_vector[2]

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:11 am in R Programming

Q. The only environment without a parent is the . . . . . . . . environment.

(A) full
(B) half
(C) null
(D) empty

💬 Discuss

✅ Correct Answer: (D) empty

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. The . . . . . . . . function is a kind of "constructor function" that can be used to construct other functions.

(A) make.pow()
(B) make.power()
(C) keep.power()
(D) keep.pow()

💬 Discuss

✅ Correct Answer: (B) make.power()

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

R Programming MCQs with answers Page - 41

Q. In R, how do you create a list named my_list with three elements: 1, "hello", and TRUE?

Q. What is the primary data structure used for storing tabular data in R?

Q. How is a vector different from a list in R?

Q. In R, how is a matrix initialized with values 1 to 9 arranged in three rows?

Q. How do you create a factor in R named color with levels "red", "green", and "blue"?

Q. What is the purpose of the data.frame() function in R?

Q. In R, how do you create a named list with elements "apple", "orange", and "banana"?

Q. What is the correct way to access the second element of a vector named my_vector in R?

Q. The only environment without a parent is the . . . . . . . . environment.

Q. The . . . . . . . . function is a kind of "constructor function" that can be used to construct other functions.

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