R Programming MCQ Questions with answers and solutions Page 32

Q. .RData extension used when we save data using the functions . . . . . . . .

(A) save()
(B) save.image()
(C) save and save.image functions
(D) serialize()

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✅ Correct Answer: (C) save and save.image functions

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

Q. Which of the following extracts first element from the following R vector?
> x <- c("a", "b", "c", "c", "d", "a")

(A) x[10]
(B) x[1]
(C) x[0]
(D) x[2]

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✅ Correct Answer: (B) x[1]

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

Q. Point out the correct statement?

(A) Times use the POSIXct and POSIXlt class
(B) Dates and times have special classes in R that allow for numerical and statistical calculations
(C) Character strings can be coerced to Date/Time classes using the strptime function
(D) All of the mentioned

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✅ Correct Answer: (D) All of the mentioned

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

Q. Which of the following R statement will save the output to the file for following R code?
> a <- data.frame(x = rnorm(100), y = runif(100))
> b <- c(3, 4.4, 1 / 3)

(A) save(a, b, file = "mydata.rda")
(B) save_image(a, b, file = "mydata.rda")
(C) keep(a, b, file = "mydata.rda")
(D) keep_image(a, b, file = "mydata.rda")

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✅ Correct Answer: (A) save(a, b, file = "mydata.rda")

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

Q. The benefit of the . . . . . . . . function is that it is the only way to perfectly repressed an R object in an exportable format, without losing precision or any metadata.

(A) save()
(B) save.image()
(C) unserialize()
(D) serialize()

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✅ Correct Answer: (D) serialize()

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

Q. What will be the output of the following R code?
> x <- as.Date("2012-01-01")
> y <- strptime("9 Jan 2011 11:34:21", "%d %b %Y %H:%M:%S")
> x-y

(A) Time difference of 356.3095 days
(B) Warning
(C) NULL
(D) Error

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✅ Correct Answer: (B) Warning

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

Q. Which of the following return a subset of the columns of a data frame?

(A) select
(B) retrieve
(C) get
(D) set

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✅ Correct Answer: (A) select

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

Q. What will be the output of the following R code?
> x <- c("a", "b", "c", "c", "d", "a")
> x[c(1, 3, 4)]

(A) "a" "b" "c"
(B) "a" "c" "c"
(C) "a" "c" "b"
(D) "b" "c" "b"

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✅ Correct Answer: (B) "a" "c" "c"

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

Q. Point out the wrong statement?

(A) Renaming a variable in a data frame in R is surprisingly hard to do
(B) The mutate() function exists to compute transformations of variables in a data frame
(C) mute() function, which does the same thing as mutate() but then drops all non-transformed variables
(D) The data frame is a key data structure in statistics and in R

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✅ Correct Answer: (C) mute() function, which does the same thing as mutate() but then drops all non-transformed variables

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

Q. What will be the output of the following R code?
> x <- matrix(1:6, 2, 3)
> x[1, 2]

(A) 3
(B) 2
(C) 1
(D) 0

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✅ Correct Answer: (A) 3

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

R Programming MCQs with answers Page - 32

Q. .RData extension used when we save data using the functions . . . . . . . .

Q. Which of the following extracts first element from the following R vector?
> x <- c("a", "b", "c", "c", "d", "a")

Q. Point out the correct statement?

Q. Which of the following R statement will save the output to the file for following R code?
> a <- data.frame(x = rnorm(100), y = runif(100))
> b <- c(3, 4.4, 1 / 3)

Q. The benefit of the . . . . . . . . function is that it is the only way to perfectly repressed an R object in an exportable format, without losing precision or any metadata.

Q. What will be the output of the following R code?
> x <- as.Date("2012-01-01")
> y <- strptime("9 Jan 2011 11:34:21", "%d %b %Y %H:%M:%S")
> x-y

Q. Which of the following return a subset of the columns of a data frame?

Q. What will be the output of the following R code?
> x <- c("a", "b", "c", "c", "d", "a")
> x[c(1, 3, 4)]

Q. Point out the wrong statement?

Q. What will be the output of the following R code?
> x <- matrix(1:6, 2, 3)
> x[1, 2]

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R Programming MCQs with answers Page - 32

Q. .RData extension used when we save data using the functions . . . . . . . .

Q. Which of the following extracts first element from the following R vector? > x <- c("a", "b", "c", "c", "d", "a")

Q. Point out the correct statement?

Q. Which of the following R statement will save the output to the file for following R code? > a <- data.frame(x = rnorm(100), y = runif(100)) > b <- c(3, 4.4, 1 / 3)

Q. The benefit of the . . . . . . . . function is that it is the only way to perfectly repressed an R object in an exportable format, without losing precision or any metadata.

Q. What will be the output of the following R code? > x <- as.Date("2012-01-01") > y <- strptime("9 Jan 2011 11:34:21", "%d %b %Y %H:%M:%S") > x-y

Q. Which of the following return a subset of the columns of a data frame?

Q. What will be the output of the following R code? > x <- c("a", "b", "c", "c", "d", "a") > x[c(1, 3, 4)]

Q. Point out the wrong statement?

Q. What will be the output of the following R code? > x <- matrix(1:6, 2, 3) > x[1, 2]

Programming Categories

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Q. Which of the following extracts first element from the following R vector?
> x <- c("a", "b", "c", "c", "d", "a")

Q. Which of the following R statement will save the output to the file for following R code?
> a <- data.frame(x = rnorm(100), y = runif(100))
> b <- c(3, 4.4, 1 / 3)

Q. What will be the output of the following R code?
> x <- as.Date("2012-01-01")
> y <- strptime("9 Jan 2011 11:34:21", "%d %b %Y %H:%M:%S")
> x-y

Q. What will be the output of the following R code?
> x <- c("a", "b", "c", "c", "d", "a")
> x[c(1, 3, 4)]

Q. What will be the output of the following R code?
> x <- matrix(1:6, 2, 3)
> x[1, 2]