R Programming MCQs (Chapterwise Multiple Choice Questions)

Which of the following commands is used to check and verify whether or not the ”xlsx" package is installed?

install.packages('xlsx‘)

any(grepl(‘x|sx',instalIed.packages()))

library('xlsx')

read.xlsx()

Answer & Explanation

Correct Answer: any(grepl(‘x|sx',instalIed.packages()))

Note: This Question is unanswered, help us to find answer for this one

Which of the following functions is used for variable conversions?

as.array

ls.data.frame

class(x)

whichmax(x)

Answer & Explanation

Correct Answer: as.array

Note: This Question is unanswered, help us to find answer for this one

Which of the following functions is used to join multiple vectors to create a data frame?

cbind()

rbind()

merge()

meit()

Answer & Explanation

Correct Answer: cbind()

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Point out the correct statement.

Empty vectors can be created with the vector() function

A sequence is represented as a vector but can contain objects of different classes

“raw” objects are commonly used directly in data analysis

None of the mentioned

Answer & Explanation

Correct Answer: Empty vectors can be created with the vector() function

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In R programming language, the library(x) function:

will load specif‌ied data sets.

will load add-on packages

will load the datasets written with save.

will start the HTML version of help.

Answer & Explanation

Correct Answer: will load add-on packages

Note: This Question is unanswered, help us to find answer for this one

There is a csv f‌ile named "data.csv". Which of the following options will read that csv f‌ile in R programming?

output <- read.csv('data.csv')

output <- readcsv(‘'data.csv')

output <- read('data.csv')

output <- readf‌ile.csv('data.csv‘)

Answer & Explanation

Correct Answer: output <- read.csv('data.csv')

Note: This Question is unanswered, help us to find answer for this one

Which of the following are the valid vector Inputs to the pie() function?

foo <- c[O. 0.0.0)

foo <. c[10. 10. 10. 70)

foo <- c(-10. 10. 0. 90)

foo <- c[0. 10. 10. 90)

Answer & Explanation

Correct Answer: foo <- c[0. 10. 10. 90)

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In R programming. which of the following are the valid values for the data type, Numeric?

123L

1 1 123

999L

2 999

Answer & Explanation

Correct Answer: 2 999

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Which of the following are related to slicing and extracting data by indexing lists?

Xl-(iznll

Xllnil

['1'] xf‌l'name

F1 x[i,j]

Answer & Explanation

Correct Answer: ['1'] xf‌l'name

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Which of the following options represents an atomic vector of the integer type?

print(24L)

print(24)

print(12.5)

print(2+3i)

Answer & Explanation

Correct Answer: print(2+3i)

Note: This Question is unanswered, help us to find answer for this one

R Programming Quick Quiz

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