Control Structures in R Programming MCQ question and answer with solution

Section 1 Section 2 Section 3

21.
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) }

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22.
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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23.
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

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24.
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

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25.
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 }

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26.
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

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27.
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)

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28.
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 }

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29.
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

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30.
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

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Control Structures in R Programming MCQ question and answer with solution | R Programming MCQs

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

Read More Section(Control Structures in R Programming)

21.
How do you create a vector containing the first 5 prime numbers in R using a while loop?

22.
In R, what is the purpose of the ifelse() function?

23.
How is the for loop different from the while loop in R?

24.
What does the Sys.sleep(2) function do in R?

25.
In R, how do you create an infinite loop?

26.
What is the output of the following R code: x <- 5; while (x > 0) { print(x); x <- x - 2 }

27.
In R, how do you create a switch statement with a default case?

28.
How do you create a loop that prints the squares of numbers from 1 to 10 in R?

29.
In R, what is the purpose of the next statement in a loop?

30.
What is the output of the following R code: for (i in 1:5) { if (i == 3) next; print(i) }