R Programming MCQ Questions with answers and solutions Page 59

Q. What will be the output of the following R code?
> f <- function(num) {
+ hello <- "Hello, world!\n"
+ for(i in seq_len(num)) {
+ cat(hello)
+ }
+ chars <- nchar(hello) * num
+ chars
+ }
> meaningoflife <- f(3)
> print(meaningoflife)

(A) 32
(B) 42
(C) 52
(D) 46

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✅ Correct Answer: (A) 32

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

Q. . . . . . . . . function is same as lapply in R.

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

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✅ Correct Answer: (C) sapply()

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

Q. What would be the value of following R expression?
log(-1)

(A) Warning in log(-1): NaNs produced
(B) 1
(C) Null
(D) 0

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✅ Correct Answer: (A) Warning in log(-1): NaNs produced

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

Q. The . . . . . . . . for R are the main feature that make it different from the original S language.

(A) scoping rules
(B) closure rules
(C) environment rules
(D) closure & environment rules

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✅ Correct Answer: (A) scoping rules

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?
> f <- function(elt) {
+ elt[, 1]
+ }
> lapply(x, f)

(A) $a [1] 1 2 $b [1] 1 2 3
(B) $a [1] 1 2 3 $b [1] 1 2 3
(C) $a [1] 1 2 3 $b [1] 1 2
(D) Error

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✅ Correct Answer: (A) $a [1] 1 2 $b [1] 1 2 3

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 prime numbers in R using a while loop?

(A) primes <- numeric(5); num <- 2; while (length(primes) < 5) { if (all(num %% 2:(num-1) != 0)) { primes <- c(primes, num) } num <- num + 1 }
(B) primes <- while (length(primes) < 5) { if (all(num %% 2:(num-1) != 0)) { c(primes, num) } num <- num + 1 }
(C) primes <- c(2, 3, 5, 7, 11); while (length(primes) < 5) { primes <- c(primes, primes[length(primes)] + 2) }
(D) primes <- numeric(5); for (i in seq(2, 11, by = 2)) { primes <- c(primes, i) }

💬 Discuss

✅ Correct Answer: (A) primes <- numeric(5); num <- 2; while (length(primes) < 5) { if (all(num %% 2:(num-1) != 0)) { primes <- c(primes, num) } num <- num + 1 }

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 ifelse() function?

(A) To create a loop that iterates a specified number of times
(B) To check a single condition and execute different code based on the result
(C) To switch between different conditions and values
(D) To generate random numbers based on a condition

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✅ Correct Answer: (B) To check a single condition and execute different code based on the result

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

Q. How is the for loop different from the while loop in R?

(A) for loop is used for fixed iterations, while loop for variable iterations
(B) while loop is used for fixed iterations, for loop for variable iterations
(C) Both for and while loops are used for fixed iterations
(D) Both for and while loops are used for variable iterations

💬 Discuss

✅ Correct Answer: (A) for loop is used for fixed iterations, while loop for variable iterations

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

Q. What does the Sys.sleep(2) function do in R?

(A) Pauses the execution of R for 2 seconds
(B) Sets the system clock to 2 seconds
(C) Sleeps the R process for 2 milliseconds
(D) Delays the execution of a loop by 2 seconds

💬 Discuss

✅ Correct Answer: (A) Pauses the execution of R for 2 seconds

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

Q. In R, how do you create an infinite loop?

(A) repeat { code_block }
(B) while (TRUE) { code_block }
(C) for (i in 1:Inf) { code_block }
(D) forever { code_block }

💬 Discuss

✅ Correct Answer: (B) while (TRUE) { code_block }

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

R Programming MCQs with answers Page - 59

Q. What will be the output of the following R code?
> f <- function(num) {
+ hello <- "Hello, world!\n"
+ for(i in seq_len(num)) {
+ cat(hello)
+ }
+ chars <- nchar(hello) * num
+ chars
+ }
> meaningoflife <- f(3)
> print(meaningoflife)

Q. . . . . . . . . function is same as lapply in R.

Q. What would be the value of following R expression?
log(-1)

Q. The . . . . . . . . for R are the main feature that make it different from the original S language.

Q. What will be the output of the following R code?
> f <- function(elt) {
+ elt[, 1]
+ }
> lapply(x, f)

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

Q. In R, what is the purpose of the ifelse() function?

Q. How is the for loop different from the while loop in R?

Q. What does the Sys.sleep(2) function do in R?

Q. In R, how do you create an infinite loop?

Programming Categories

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R Programming MCQs with answers Page - 59

Q. What will be the output of the following R code? > f <- function(num) { + hello <- "Hello, world!\n" + for(i in seq_len(num)) { + cat(hello) + } + chars <- nchar(hello) * num + chars + } > meaningoflife <- f(3) > print(meaningoflife)

Q. . . . . . . . . function is same as lapply in R.

Q. What would be the value of following R expression? log(-1)

Q. The . . . . . . . . for R are the main feature that make it different from the original S language.

Q. What will be the output of the following R code? > f <- function(elt) { + elt[, 1] + } > lapply(x, f)

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

Q. In R, what is the purpose of the ifelse() function?

Q. How is the for loop different from the while loop in R?

Q. What does the Sys.sleep(2) function do in R?

Q. In R, how do you create an infinite loop?

Programming Categories

📱 Download Our App

Q. What will be the output of the following R code?
> f <- function(num) {
+ hello <- "Hello, world!\n"
+ for(i in seq_len(num)) {
+ cat(hello)
+ }
+ chars <- nchar(hello) * num
+ chars
+ }
> meaningoflife <- f(3)
> print(meaningoflife)

Q. What would be the value of following R expression?
log(-1)

Q. What will be the output of the following R code?
> f <- function(elt) {
+ elt[, 1]
+ }
> lapply(x, f)