R Programming MCQs with answers Page - 1

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Q. Which function is used to automatically vectorize?

  • (A) lapply()
  • (B) kapply()
  • (C) mapply()
  • (D) happly()

A

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Q. What is the function used to test objects (returns a logical operator) if they are NA?

  • (A) is.na()
  • (B) is.nan()
  • (C) as.na()
  • (D) as.nan()

A

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Q. The longer programs are called . . . . . . . .

  • (A) Files
  • (B) Structures
  • (C) Scripts
  • (D) Data

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Q. Which of the R following code is example of explicit printing?

  • (A) > x <- 5 > x
  • (B) > x <- 5 > print(x)
  • (C) > x <- "auto" > x
  • (D) > x <- "auto" > x <- "auto"

A

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Q. What is the meaning of the following R function?
x <- c(4, 5, 1, 2, 3, 3, 4, 4, 5, 6)
x <- as.factor(x)

  • (A) x becomes a factor
  • (B) x is a factor
  • (C) x does not exist
  • (D) x is not a vector

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Q. R runs on the . . . . . . . . operating system.

  • (A) Linux
  • (B) Windows
  • (C) Ubuntu
  • (D) Any operating system

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Q. There are more than . . . . . . . . packages on CRAN that have been developed by users and programmers around the world.

  • (A) 40
  • (B) 400
  • (C) 4000
  • (D) 40000

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Q. Point out the wrong statement?

  • (A) : operator is used to create integer sequences
  • (B) The numbers in the square brackets are part of the vector itself
  • (C) There is a difference between the actual R object and the manner in which that R object is printed to the console
  • (D) Files containing R scripts ends with extension .R

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Q. Finally, in . . . . . . . . R version 1.0.0 was released to the public.

  • (A) 2000
  • (B) 2005
  • (C) 2010
  • (D) 2012

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