R Programming MCQ Questions And Answers - Functions

This section focuses on "Functions" in R Programming. These Multiple Choice Questions (MCQ) should be practiced to improve the R Programming skills required for various interviews (campus interviews, walk-in interviews, company interviews), placements, entrance exams and other competitive examinations.

1. An R function is created by using the keyword?

A. fun
B. function
C. declare
D. extends

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2. What will be output for the following code?

print(mean(25:82))

A. 1526
B. 53.5
C. 50.5
D. 55

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3. Point out the wrong statement?

A. Functions in R are “second class objects”
B. The writing of a function allows a developer to create an interface to the code, that is explicitly specified with a set of parameters
C. Functions provides an abstraction of the code to potential users
D. Writing functions is a core activity of an R programmer

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4. What will be output for the following code?

> paste("a", "b", se = ":")

A. a+b
B. a:b
C. a-b
D. None of the above

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5. Which function in R language is used to find out whether the means of 2 groups are equal to each other or not?

A. f.tests ()
B. l.tests ()
C. t.tests ()
D. p.tests ()

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6. What will be the output of log (-5.8) when executed on R console?

A. NA
B. NAN
C. 0.213
D. Error

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7. Which function is preferred over sapply as vapply allows the programmer to specific the output type?

A. Lapply
B. Japply
C. Vapply
D. Zapply

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8. How will you check if an element is present in a vector?

A. Match()
B. Dismatch()
C. Mismatch()
D. Search()

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9. You can check to see whether an R object is NULL with the _________ function.

A. is.null()
B. is.nullobj()
C. null()
D. as.nullobj()

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10. In the base graphics system, which function is used to add elements to a plot?

A. Boxplot()
B. Text()
C. Treat()
D. Both A and B

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