R Programming MCQ Questions with answers and solutions Page 60

Q. What is the output of the following R code: x <- 5; while (x > 0) { print(x); x <- x - 2 }

(A) 5, 3, 1
(B) 5, 4, 3, 2, 1
(C) 5, 2, 1
(D) 5, 3, 2, 1

💬 Discuss

✅ Correct Answer: (B) 5, 4, 3, 2, 1

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

Q. In R, how do you create a switch statement with a default case?

(A) switch(case_expression, list("case1" = expr1, "case2" = expr2, "default" = default_expr))
(B) switch(case_expression, "case1" = expr1, "case2" = expr2, default = default_expr)
(C) switch(case_expression, case1 = expr1, case2 = expr2, default = default_expr)
(D) switch(case_expression, "case1", "case2", default = default_expr)

💬 Discuss

✅ Correct Answer: (C) switch(case_expression, case1 = expr1, case2 = expr2, default = default_expr)

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

Q. How do you create a loop that prints the squares of numbers from 1 to 10 in R?

(A) for (i in 1:10) { print(i^2) }
(B) for (i = 1; i <= 10; i++) { print(i^2) }
(C) while (i <= 10) { print(i^2); i <- i + 1 }
(D) repeat { print(i^2); i <- i + 1; if (i > 10) break }

💬 Discuss

✅ Correct Answer: (A) for (i in 1:10) { print(i^2) }

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

Q. In R, what is the purpose of the next statement in a loop?

(A) Skips the next condition in an if-else statement
(B) Exits the loop immediately
(C) Moves to the next iteration of the loop
(D) Restarts the loop from the beginning

💬 Discuss

✅ Correct Answer: (C) Moves to the next iteration of the loop

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

Q. What is the output of the following R code: for (i in 1:5) { if (i == 3) next; print(i) }

(A) 1, 2, 4, 5
(B) 1, 2, 3, 4, 5
(C) 2, 4
(D) 1, 2, 3, 4, 5

💬 Discuss

✅ Correct Answer: (A) 1, 2, 4, 5

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

Q. How is a do-while loop implemented in R?

(A) do { code_block } while (condition)
(B) while (condition) { code_block }
(C) do { code_block } until (condition)
(D) while (condition) do { code_block }

💬 Discuss

✅ Correct Answer: (A) do { code_block } while (condition)

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

Q. In R, what does the if (condition) { code_block } else { code_block } statement do?

(A) Executes code_block if the condition is true, otherwise executes the else block
(B) Executes code_block if the condition is false, otherwise executes the else block
(C) Executes code_block if the condition is true, otherwise does nothing
(D) Executes code_block if the condition is false, otherwise does nothing

💬 Discuss

✅ Correct Answer: (A) Executes code_block if the condition is true, otherwise executes the else block

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

Q. How is the repeat loop terminated in R?

(A) Using the break statement
(B) Using the stop statement
(C) Using the terminate statement
(D) Using the end statement

💬 Discuss

✅ Correct Answer: (A) Using the break statement

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

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

(A) To determine the length of an object
(B) To identify the positions of elements satisfying a condition
(C) To create a loop based on certain conditions
(D) To concatenate two vectors

💬 Discuss

✅ Correct Answer: (B) To identify the positions of elements satisfying a condition

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

Q. How do you create a vector containing the first 5 positive even numbers in R using a loop?

(A) even_numbers <- numeric(5); for (i in 1:5) { even_numbers[i] <- 2 * i }
(B) even_numbers <- for (i in 1:5) { 2 * i }
(C) even_numbers <- seq(2, 10, by = 2)
(D) even_numbers <- c(2, 4, 6, 8, 10)

💬 Discuss

✅ Correct Answer: (A) even_numbers <- numeric(5); for (i in 1:5) { even_numbers[i] <- 2 * i }

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

R Programming MCQs with answers Page - 60

Q. What is the output of the following R code: x <- 5; while (x > 0) { print(x); x <- x - 2 }

Q. In R, how do you create a switch statement with a default case?

Q. How do you create a loop that prints the squares of numbers from 1 to 10 in R?

Q. In R, what is the purpose of the next statement in a loop?

Q. What is the output of the following R code: for (i in 1:5) { if (i == 3) next; print(i) }

Q. How is a do-while loop implemented in R?

Q. In R, what does the if (condition) { code_block } else { code_block } statement do?

Q. How is the repeat loop terminated in R?

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

Q. How do you create a vector containing the first 5 positive even numbers in R using a loop?

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