R Programming MCQ Questions with answers and solutions Page 56

Q. . . . . . . . . function gives an error message if the desired package cannot be loaded.

(A) Dplyr
(B) Require
(C) Library
(D) Sample

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✅ Correct Answer: (C) Library

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

Q. What will be the output of the following R code?
> x <- list(a = 1:5, b = rnorm(10))
> lapply(x, mean)

(A) $a [1] 3 $b [1] 0.1322028
(B) $a [1] 4 $b [1] 0.1322028
(C) $a [1] 5 $b [1] 0.1322028
(D) $a [2] 5 $b [1] 3

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✅ Correct Answer: (A) $a [1] 3 $b [1] 0.1322028

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

Q. Which of the following R code syntax is syntactically valid?

(A) if ( statement1 ) { statement2 } else if ( statement3 ) { statement4 } else if ( statement5 ) { statement6 } else statement8
(B) if ( statement1 ) { statement2 } elseif ( statement3 ) { statement4 } elseif ( statement5 ) { statement6 } else statement8
(C) if ( statement1 ) { statement2 } elseif ( statement3 ) { statement4 } else if ( statement5 ) { statement6 } else statement8
(D) if ( statement1 ) { statement2 } else if ( statement5 ) { statement6 } else statement8

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✅ Correct Answer: (A) if ( statement1 ) { statement2 } else if ( statement3 ) { statement4 } else if ( statement5 ) { statement6 } else statement8

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

Q. . . . . . . . . function takes various parameters like formula, data, subset, labels, etc.

(A) Pears
(B) Pairs
(C) Tears
(D) Cars

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✅ Correct Answer: (B) Pairs

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

Q. . . . . . . . . functions can be "built which contain all of the necessary data for evaluating the function.

(A) Objective
(B) reflective
(C) Nested
(D) Symmetry

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✅ Correct Answer: (A) Objective

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

Q. . . . . . . . . loop over a list and evaluate a function on each element.

(A) apply()
(B) lapply()
(C) sapply()
(D) mapply()

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✅ Correct Answer: (A) apply()

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

Q. Point out the correct statement?

(A) The next statement causes an exit from the innermost loop that is currently being executed
(B) There are two statements that can be used to explicitly control looping
(C) The break statement immediately causes control to return to the start of the loop
(D) Computation in R consists of sequentially evaluating statements

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✅ Correct Answer: (B) There are two statements that can be used to explicitly control looping

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

Q. Point out the correct statement?

(A) Statements, such as x<-1:10 or mean(y), can be separated by either a semicolon or a new line
(B) Whenever the evaluator is presented with a syntactically complete statement that statement is evaluated and the value returned
(C) Computation in R consists of sequentially evaluating statements
(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 10:12 am in R Programming

Q. What will be the output of the following R code?
> printmessage <- function(x) {
+ if(x > 0)
+ print("x is greater than zero")
+ else
+ print("x is less than or equal to zero")
+ invisible(x)
+ }
> printmessage(NA)

(A) Error
(B) Warning
(C) Messages
(D) Null

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✅ Correct Answer: (A) Error

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

Q. Point out the wrong statement?

(A) The sapply() function behaves similarly to lapply()
(B) With multiple factors and many levels, creating an interaction can result in many levels that are empty
(C) apply() can be thought of as a combination of split() and sapply() for vectors only
(D) You can use tsplit() to evaluate a function single time each with a same argument

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✅ Correct Answer: (C) apply() can be thought of as a combination of split() and sapply() for vectors only

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

R Programming MCQs with answers Page - 56

Q. . . . . . . . . function gives an error message if the desired package cannot be loaded.

Q. What will be the output of the following R code?
> x <- list(a = 1:5, b = rnorm(10))
> lapply(x, mean)

Q. Which of the following R code syntax is syntactically valid?

Q. . . . . . . . . function takes various parameters like formula, data, subset, labels, etc.

Q. . . . . . . . . functions can be "built which contain all of the necessary data for evaluating the function.

Q. . . . . . . . . loop over a list and evaluate a function on each element.

Q. Point out the correct statement?

Q. Point out the correct statement?

Q. What will be the output of the following R code?
> printmessage <- function(x) {
+ if(x > 0)
+ print("x is greater than zero")
+ else
+ print("x is less than or equal to zero")
+ invisible(x)
+ }
> printmessage(NA)

Q. Point out the wrong statement?

Programming Categories

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R Programming MCQs with answers Page - 56

Q. . . . . . . . . function gives an error message if the desired package cannot be loaded.

Q. What will be the output of the following R code? > x <- list(a = 1:5, b = rnorm(10)) > lapply(x, mean)

Q. Which of the following R code syntax is syntactically valid?

Q. . . . . . . . . function takes various parameters like formula, data, subset, labels, etc.

Q. . . . . . . . . functions can be "built which contain all of the necessary data for evaluating the function.

Q. . . . . . . . . loop over a list and evaluate a function on each element.

Q. Point out the correct statement?

Q. Point out the correct statement?

Q. What will be the output of the following R code? > printmessage <- function(x) { + if(x > 0) + print("x is greater than zero") + else + print("x is less than or equal to zero") + invisible(x) + } > printmessage(NA)

Q. Point out the wrong statement?

Programming Categories

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Q. What will be the output of the following R code?
> x <- list(a = 1:5, b = rnorm(10))
> lapply(x, mean)

Q. What will be the output of the following R code?
> printmessage <- function(x) {
+ if(x > 0)
+ print("x is greater than zero")
+ else
+ print("x is less than or equal to zero")
+ invisible(x)
+ }
> printmessage(NA)