R Programming MCQs with answers Page - 2

Here, you will find a collection of MCQ questions on R Programming. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. A . . . . . . . . is a variable that holds one value at a time.

  • (A) Scalar variable
  • (B) Duplex
  • (C) High
  • (D) Vector

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Q. Which of the following is not an object of R?

  • (A) calls
  • (B) expressions
  • (C) strings
  • (D) names

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Q. Scripts will run on . . . . . . . .

  • (A) Script Editors
  • (B) Console
  • (C) Terminal
  • (D) GCC Compiler

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Q. Why is it needed for R studio to update regularly?

  • (A) Bugs
  • (B) More Functions
  • (C) Methods
  • (D) For more packages

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Q. If commands are stored in an external file, say commands.R in the working directory work, they may be executed at any time in an R session with the command . . . . . . . .

  • (A) source("commands.R")
  • (B) exec("commands.R")
  • (C) execute("commands.R")
  • (D) exect("command.R")

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Q. Point out the wrong statement?

  • (A) The grammar of the language determines whether an expression is complete or not
  • (B) The <- symbol is the assignment operator in R
  • (C) The ## character indicates a comment
  • (D) R does not support multi-line comments or comment blocks

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Q. Which of the following will start the R program?

  • (A) $ R
  • (B) > R
  • (C) * R
  • (D) @ R

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Q. What will be the output of the following R function?
nchar()

  • (A) no. of characters
  • (B) first 5 characters
  • (C) last 5 characters
  • (D) Does not exist

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Q. What is the meaning of the following R function?
print( sqrt(2) )

  • (A) 1.414314
  • (B) 1.414214
  • (C) Error
  • (D) 14.1414

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Q. What is the function to set row names for a data frame?

  • (A) row.names()
  • (B) colnames()
  • (C) col.names()
  • (D) column name cannot be set for a data frame

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