R Programming Questions and Answers – Console Input and Evaluation – 1

This set of R Programming Language Multiple Choice Questions & Answers (MCQs) focuses on “Console Input and Evaluation – 1”.

1. What will be the output of the following R code?

> x <- 1
> print(x)

a) 1
b) 2
c) 3
d) 5
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2. 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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3. 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"

4. Files containing R scripts ends with extension ____________
a) .S
b) .R
c) .Rp
d) .SP
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5. 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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6. 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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7. _______ will divert all subsequent output from the console to an external file.
a) sink
b) div
c) exp
d) exc
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8. The entities that R creates and manipulates are known as ________
a) objects
b) task
c) container
d) packages
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9. Which of the following can be used to display the names of (most of) the objects which are currently stored within R?
a) object()
b) objects()
c) list()
d) class()
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10. Collection of objects currently stored in R is called as ________________
a) package
b) workspace
c) list
d) task
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