R Programming FAQs

The post is about the “MCQs R Basics Quiz” which will help you check your ability to execute some basic or R Language, RStudio, Jupyter Notebook, and Google Colab. This quiz will help the learner to understand some basic concepts related to R Programming Language. This quiz may also improve your computational understanding, and it will also help you to learn and practice the MCQs R Basics Quiz now.

Online MCQs R Basics Quiz Questions with Answers

1. How many working directories can you have set simultaneously in an R session?

 Unlimited

 None of these

 Two

 One

2. You want to access the “Date” column of a data frame called sales_data so you can operate on it. What is the correct way to refer to this column?

 sales_data%Date

 sales_data.Date

 sales_data$Date

 sales_data#Date

3. Which of the following most accurately describes R?

 R is a statistical programming language

 R is an operating system

 R has a point and click graphical interface like Tableau of Microsoft Excel

 R is a graphical software

4. Will R return a value of true or false if you evaluate this expression? "apple"=="appla"

 It will result in an error message

 It will return the value “TRUE”

 It will return the value “FALSE”

 It will result in 1

5. Which of these is the easiest way to save R code that you write for future use?

 Write your R code in a word processor like Microsoft Word, then import it into R when you want to run it

 Write R code in MS Paint

 Write your R code into the console in RStudio

 Edit the code in the RStudio script pane

6. Is it easier to import rectangular or non-rectangular data into R?

 Rectangular

 Non-rectangular

7. After you finish the trial period, R will cost hundreds of dollars to use, depending on the license you purchase.

 False

 True

 None of these

8. What value will this return?

subtract_and_divide <- function(x, y){
x - y
x / y
}
subtract_and_divide(4, 8)

 4

 -4

 .5

 -4 and .5

9. What does this line of code do in R? a <- 2+2

 Results in 4

 Assigns the value of 2+2 to the object “a”

 Creates a function (a) that will execute 2+2

 Tells R that “a” will be less than or equal to 2+2

10. What will happen if you try to run this line of code in R? 10variable1 <- c(5,19,10,"apple")

 R will save the vector to the object 10variable1

 R will return an error because 10variable1 is not a valid object name

 R will return an error because you cannot combine numbers and character strings into the same vector in R

 There will be an error message

11. Which of the following correctly describes the relationship between RStudio and R?

 RStudio and R are same software, there is no difference between them

 RStudio is essentially a code editor that adds some user-friendly features for writing code in R

 RStudio is a requirement for using R

 R comes installed on all PCs and Macs

12. What does the class() function do in R?

 It clears the all R objects

 Creates a new object class in R

 Gives a line of output that identifies the class of an object in R

 Assigns a class to an object in R

13. What is the easiest way to export a figure you create in RStudio?

 In the plot pane, click export, then click “Save as Image” or “Save as PDF”

 In the plot function, use the option “output=[your file path]

 Zoom out on the plot pane and take a screen snip

14. What happens if you run this code? data.frame(alpha,beta)

 You are asking R whether the objects alpha and beta are data frames

 A vector will be created

 You are creating a data frame with alpha and beta and saving it to the R environment

 You are asking R to display a data frame with alpha and beta in the R console

15. Are cheat sheets trustworthy guides for how to use R and RStudio?

 No

 None of these

 Yes

16. Why is it helpful to be able to use functions like rnorm, rpois, rbinom, and runif?

 These functions will draw figures of the distributions, and you need to be able to distinguish between these different functions quickly if you are going to visualize data successfully

 These functions tell R to draw the underlying distributions as figures, and this is a good way to see what different figures look like

 These functions will check whether your data conforms with common data distributions, which tells you what kind of plot you should make with those data

 These functions will generate arbitrary numbers quickly that you can use to test visualization functions

17. In R, create the following object: test_vector <- c("dog","fish","pig","parrot").
After you create the object, what do you get if you then run test_vector[4]?

 “dog”,”fish”,”pig”,”parrot”

 “parrot”

 TRUE

 “fish”

18. You need to carefully learn and understand all the details about how R works before you start coding.

 False

 None of these

 True

19. What part of the data frame “states” does this code call? states[15,2]

 The entry of the 15th row down in the second column from the left

 The entry of the second row down in the 15th column from the left

 The entry of the 15th row down in the second column from the right

20. Say you have a data frame named “inventory” with 3 rows and two columns, created like this:
home <- c("computer", "calculator", "scanner")
office <- c("paper", "pens", "pencils")
inventory <- data.frame(home, office)
What would happen if you ran this code?
inventory$annex <- c("printer", "stapler")

 You will get a new column called office populated by “printer” and “stapler.”

 You will get an error message because you are trying to add a column that only has two rows

 A new row with the rowID office will be added to the data

 Loading …

Online MCQs R Basics Quiz with Answers

• Which of the following most accurately describes R?
• Which of the following correctly describes the relationship between RStudio and R?
• Which of these is the easiest way to save R code that you write for future use?
• After you finish the trial period, R will cost hundreds of dollars to use, depending on the license you purchase.
• You need to carefully learn and understand all the details about how R works before you start coding.
• Are cheat sheets trustworthy guides for how to use R and RStudio?
• What does this line of code do in R? a <- 2+2
• Will R return a value of true or false if you evaluate this expression? “apple”==”appla”
• What will happen if you try to run this line of code in R? 10variable1 <- c(5, 19, 10, “apple”)
• In R, create the following object: test_vector <- c(“dog”, “fish”, “pig”, “parrot”). After you create the object, what do you get if you then run test_vector[4]?
• What value will this return?
  subtract_and_divide <- function(x, y){
  x – y
  x / y
  }
  subtract_and_divide(4, 8)
• What happens if you run this code? data.frame(alpha,beta)
• What part of the data frame “states” does this code call? states[15,2]
• Say you have a data frame named “inventory” with 3 rows and two columns, created like this:
  home <- c(“computer”, “calculator”, “scanner”)
  office <- c(“paper”, “pens”, “pencils”)
  inventory <- data.frame(home, office)
  What would happen if you ran this code? inventory$annex <- c(“printer”, “stapler”)
• How many working directories can you have set simultaneously in an R session?
• Is it easier to import rectangular or non-rectangular data into R?
• You want to access the “Date” column of a data frame called sales_data so you can operate on it. What is the correct way to refer to this column?
• What does the class() function do in R?
• Why is it helpful to be able to use functions like rnorm, rpois, rbinom, and runif?
• What is the easiest way to export a figure you create in RStudio?

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