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R for Data Analytics MCQ - Data Structures in R

11 Which function displays the internal structure, data types, and a compact preview of an R object?

str() provides a compact display of the internal structure of an R object.

12 What is the purpose of drop = FALSE when subsetting a matrix or data frame?

drop = FALSE preserves the dimensional structure of the result.

13 What happens when factor levels are converted directly with as.numeric(factor_object)?

Direct numeric conversion of a factor returns its internal integer level codes.

14 Which function removes unused factor levels after subsetting?

droplevels() removes factor levels that are no longer represented in the data.

15 What does unlist() do to a list when possible?

unlist() recursively simplifies list contents into an atomic vector when possible.

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Question:

Which function is commonly used to create a data frame in R?

A. frame()
B. data.frame()
C. dataframe()
D. table.frame()

Correct answer: B

Explanation:

The data.frame() function creates a data frame, one of the main tabular data structures used in R.

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