Control Structures In R Programming — Part 1 MCQs with Explanations

while loop is the correct answer to “Which control structure in R is used to execute a block of code repeatedly until a condition is met”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

To execute a block of code if a condition is true, otherwise execute another block of code is the correct answer to “In R, what is the purpose of the if-else statement”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

To select one of several alternatives is the correct answer to “How is the switch() function used in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

for (i in 1:10) { code_block } is the correct answer to “In R, what is the syntax for the for loop”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

To exit the loop immediately is the correct answer to “What is the purpose of the break statement in a loop in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

for loop is used for fixed iterations, while loop for variable iterations is the correct answer to “How is a while loop different from a for loop in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

Jumps to the next iteration of the loop is the correct answer to “What does the next statement do in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

To repeat a block of code indefinitely is the correct answer to “In R, what is the purpose of the repeat loop”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

1 is the correct answer to “What is the result of the expression 5 %% 2 in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

To check a single condition and execute different code based on the result is the correct answer to “In R, what is the role of the ifelse() function”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

do { code_block } while (condition) is the correct answer to “How is a do-while loop implemented in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

Executes code_block if the condition is true, otherwise executes the else block is the correct answer to “In R, what does the if (condition) { code_block } else { code_block } statement do”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

Using the break statement is the correct answer to “How is the repeat loop terminated in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

To identify the positions of elements satisfying a condition is the correct answer to “What is the purpose of the which() function in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

even_numbers <- numeric(5); for (i in 1:5) { even_numbers[i] <- 2 * i } is the correct answer to “How do you create a vector containing the first 5 positive even numbers in R using a loop”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

2, 4 is the correct answer to “What is the output of the following R code: for (i in 1:5) { if (i %% 2 == 0) { print(i) } }”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

To exit the loop immediately is the correct answer to “In R, what is the purpose of the repeat loop combined with break”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

switch() is used for multiple conditions, if-else for two conditions is the correct answer to “How is the switch() function different from if-else in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

To move to the next iteration of the loop is the correct answer to “What is the role of the next statement in a loop in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

Repeats a block of code a specified number of times and skips to the next iteration is the correct answer to “In R, what does the repeat loop combined with next do”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

primes <- numeric(5); num <- 2; while (length(primes) < 5) { if (all(num %% 2:(num-1) != 0)) { primes <- c(primes, num) } num <- num + 1 } is the correct answer to “How do you create a vector containing the first 5 prime numbers in R using a while loop”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

To check a single condition and execute different code based on the result is the correct answer to “In R, what is the purpose of the ifelse() function”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

for loop is used for fixed iterations, while loop for variable iterations is the correct answer to “How is the for loop different from the while loop in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

Pauses the execution of R for 2 seconds is the correct answer to “What does the Sys.sleep(2) function do in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

while (TRUE) { code_block } is the correct answer to “In R, how do you create an infinite loop”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

5, 4, 3, 2, 1 is the correct answer to “What is the output of the following R code: x <- 5; while (x > 0) { print(x); x <- x - 2 }”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

switch(case_expression, case1 = expr1, case2 = expr2, default = default_expr) is the correct answer to “In R, how do you create a switch statement with a default case”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

for (i in 1:10) { print(i^2) } is the correct answer to “How do you create a loop that prints the squares of numbers from 1 to 10 in R”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

Moves to the next iteration of the loop is the correct answer to “In R, what is the purpose of the next statement in a loop”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

1, 2, 4, 5 is the correct answer to “What is the output of the following R code: for (i in 1:5) { if (i == 3) next; print(i) }”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

function is the correct answer to “A function, together with an environment, makes up what is called a . . . . . . . . closure.”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

function (X, FUN, ...) { FUN <- match.fun(FUN) if (!is.vector(X) || is.object(X)) X <- as.list(X) .Internal(lapply(X, FUN)) } is the correct answer to “Body of lapply function is”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

break is the correct answer to “. . . . . . . . is used to break the execution of a loop.”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

Substr is the correct answer to “Write a function to extract the first name in the string "Mrs. Jake Luther"”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

> x <- 1:4 > lapply(x, runif, min = 0, max = 10) is the correct answer to “Which of the following R code will print the following result? [[1]] [1] 2.263808 [[2]] [1] 1.314165 9.815635 [[3]] [1] 3.270137 5.069395 6.814425 [[4]] [1] 0.9916910 1.1890256 0.5043966 9.2925392”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

32 is the correct answer to “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)”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

sapply() is the correct answer to “. . . . . . . . function is same as lapply in R.”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

Warning in log(-1): NaNs produced is the correct answer to “What would be the value of following R expression? log(-1)”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

scoping rules is the correct answer to “The . . . . . . . . for R are the main feature that make it different from the original S language.”. This question is standard in competitive examination syllabi for Control Structures In R Programming.

$a [1] 1 2 $b [1] 1 2 3 is the correct answer to “What will be the output of the following R code? > f <- function(elt) { + elt[, 1] + } > lapply(x, f)”. This question is standard in competitive examination syllabi for Control Structures In R Programming.