1. Which of the following is NOT a control structure in R?

A . if-else

B . for

C . while

D . switch-case

Answer

2. How do you define a function in R?

A . function myFunc() { }

B . def myFunc() { }

C . myFunc <- function() { }

D . create function myFunc() { }

Answer

3. What will be the output of c(1,2,3) + c(4,5,6)?

A . c(5,7,9)

B . c(4,5,6,1,2,3)

C . c(1,2,3,4,5,6)

D . Error

Answer

4. How do you check the length of a vector?

A . size()

B . length()

C . dim()

D . count()

Answer

5. What will seq(1, 10, by=3) generate?

A . c(1,2,3,4,5,6,7,8,9,10)

B . c(1,4,7,10)

C . c(1,5,10)

D . c(1,2,5,7,10)

Answer

6. What is the default mode of a vector created using c(1,2,3,4)?

A . Character

B . Integer

C . Numeric

D . Logical

Answer

7. How do you remove an element from a vector?

A . remove(vector, index)

B . vector <- vector[-index]

C . del(vector, index)

D . vector.delete(index)

Answer

8. What will rep(1, times=5) produce?

A . c(1,1,1,1,1)

B . c(1,5)

C . c(5,5,5,5,5)

D . Error

Answer

9. How do you extract the 3rd element from a vector v?

A . v{3}

B . v(3)

C . v[3]

D . v[[3]]

Answer

10. What will 1:5 * 2 return?

A . c(1,2,3,4,5,2,4,6,8,10)

B . c(2,4,6,8,10)

C . c(1,2,3,4,5,2)

D . Error

Answer

11. What will length(c(TRUE, FALSE, TRUE)) return?

A . 3

B . 2

C . 1

D . TRUE

Answer

12. How do you check if an object is a matrix?

A . is.matrix()

B . isMatrix()

C . matrix.check()

D . is.mat()

Answer

13. How do you create a 3x3 matrix with values 1 to 9?

A . matrix(1:9, nrow=3, ncol=3)

B . matrix(1,9,3,3)

C . mat(1:9, 3, 3)

D . array(1:9, c(3,3))

Answer

14. How do you create a list in R?

A . list(a=1, b=2, c=3)

B . c(a=1, b=2, c=3)

C . array(a=1, b=2, c=3)

D . vector(a=1, b=2, c=3)

Answer

15. How do you extract an element from a list in R?

A . listname[element]

B . listname[[element]]

C . listname{element}

D . listname.element

Answer

16. What function is used to get the current date?

A . Sys.time()

B . Sys.Date()

C . date()

D . currentDate()

Answer

17. What will as.logical(0) return?

A . TRUE

B . FALSE

C . 0

D . Error

Answer

18. Which loop is used to iterate over a sequence in R?

A . for loop

B . while loop

C . repeat loop

D . if loop

Answer

19. Which function is used to return a value from a function in R?

A . return()

B . output()

C . result()

D . value()

Answer

20. Which function is used to assign a value to a global variable inside a function in R?

A . global()

B . assign()

C . set()

D . <<-

Answer

21. Which function is used to create a sequence of numbers in R?

A . seq()

B . sequence()

C . range()

D . generate()

Answer

Fill in the Blanks

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22. What does nrow() return? __________________________

Answer

23. What does ncol() return? ____________________________ 

Answer

24. What is the output of Sys.time()?_______________________________ 

Answer

25. ________________ function is used to check the type of an object? 

Answer

26. ____________________ function is used to check if a variable is a function? 

Answer

27. How do you extract an element from a matrix? ______________________  

Answer

28. ____________________ function is used to convert a matrix to a vector? 

Answer

29.What does is.numeric("5") return? ________________________

Answer

30.____________________ is used to create an empty vector? 

Answer

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Relevant Materials :

☞ R - Programming MCQs - Unit-1 - [ R-Programming ]

☞ R - Programming MCQs - Unit-2 - [ R-Programming ]

☞ R - Programming MCQs - Unit-3 - [ R-Programming ]

☞ R - Programming MCQs - Unit-4 - [ R-Programming ]

☞ R - Programming MCQs - Unit-5 - [ R-Programming ]

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