R Programming Basics — Part 2 MCQs with Explanations

Lists is the correct answer to “An ordered collection of objects or components are called . . . . . . . .”. This question is standard in competitive examination syllabi for R Programming Basics.

Spline is the correct answer to “The . . . . . . . . function returns a list of densities (y) corresponding to bin values (x).”. This question is standard in competitive examination syllabi for R Programming Basics.

Rownames() is the correct answer to “Data frames can have additional attributes such as . . . . . . . .”. This question is standard in competitive examination syllabi for R Programming Basics.

copy() is the correct answer to “The . . . . . . . . function takes an arbitrary number of arguments and concatenates them one by one into character strings.”. This question is standard in competitive examination syllabi for R Programming Basics.

Same is the correct answer to “All columns in a matrix must have the same mode and the . . . . . . . . length.”. This question is standard in competitive examination syllabi for R Programming Basics.

Lists is the correct answer to “The four most frequently used types of data objects in R are vectors, matrices, data frames and . . . . . . . .”. This question is standard in competitive examination syllabi for R Programming Basics.

Matrix is the correct answer to “. . . . . . . .are Data frames which contain lists of homogeneous data in a tabular format.”. This question is standard in competitive examination syllabi for R Programming Basics.

[,1] [,2] [,3] x 1 2 3 y 10 11 12 is the correct answer to “What will be the output of the following R code? > x <- 1:3 > y <- 10:12 > rbind(x, y)”. This question is standard in competitive examination syllabi for R Programming Basics.

Rbind is the correct answer to “To bind a row onto an already existing matrix, the . . . . . . . . function can be used.”. This question is standard in competitive examination syllabi for R Programming Basics.

Lists is the correct answer to “vectors can be one of two types namely atomic vectors and . . . . . . . .”. This question is standard in competitive examination syllabi for R Programming Basics.

Matrix is the correct answer to “A . . . . . . . . is a set of elements appearing in rows and columns where the elements are of the same mode whether they are logical, numeric (integer or double), complex or character.”. This question is standard in competitive examination syllabi for R Programming Basics.

Rep is the correct answer to “Which function replicates elements of vectors”. This question is standard in competitive examination syllabi for R Programming Basics.

colnames(m) <- c("h", "f") is the correct answer to “Which of the following statement changes column name to h and f”. This question is standard in competitive examination syllabi for R Programming Basics.

Iris is the correct answer to “Which of the following is a 3-dimensional dataset”. This question is standard in competitive examination syllabi for R Programming Basics.

NaN is the correct answer to “What will be the output of the following R code? > sqrt(-17)”. This question is standard in competitive examination syllabi for R Programming Basics.

x y [1,] 1 10 [2,] 2 11 [3,] 3 12 is the correct answer to “What will be the output of the following R code? > x <- 1:3 > y <- 10:12 > cbind(x, y)”. This question is standard in competitive examination syllabi for R Programming Basics.

None of the mentioned is the correct answer to “Which of the following statement is invalid”. This question is standard in competitive examination syllabi for R Programming Basics.

Lists is the correct answer to “Locator function gives output as . . . . . . . .”. This question is standard in competitive examination syllabi for R Programming Basics.

double is the correct answer to “Numbers in R are generally treated as . . . . . . . . precision real numbers.”. This question is standard in competitive examination syllabi for R Programming Basics.

Single is the correct answer to “To extract a sublist, we use . . . . . . . . brackets.”. This question is standard in competitive examination syllabi for R Programming Basics.

snames is the correct answer to “Using the . . . . . . . . vector, we create a species factor and bind it to the columns of iris.df.”. This question is standard in competitive examination syllabi for R Programming Basics.

Vector is the correct answer to “Which is the basic data structure of R containing the same type of data”. This question is standard in competitive examination syllabi for R Programming Basics.

[,1] [,2] [,3] [1,] 1 3 5 [2,] 2 4 6 is the correct answer to “What will be the output of the following R code? > m <- matrix(1:6, nrow = 2, ncol = 3) > m”. This question is standard in competitive examination syllabi for R Programming Basics.

2 is the correct answer to “What will be the output of the following R code? > x <- data.frame(foo = 1:4, bar = c(T, T, F, F)) > ncol(x)”. This question is standard in competitive examination syllabi for R Programming Basics.

> name(x) <- c("New York", "Seattle", "Los Angeles") is the correct answer to “Which of the following is invalid assignment”. This question is standard in competitive examination syllabi for R Programming Basics.

Array is the correct answer to “Which function takes a dim attribute which creates the required number of dimensions”. This question is standard in competitive examination syllabi for R Programming Basics.

NULL is the correct answer to “What will be the output of the following R code? > x <- vector("list", length = 5) > x”. This question is standard in competitive examination syllabi for R Programming Basics.

Matrix is the correct answer to “A . . . . . . . . is a two-dimensional rectangular data set.”. This question is standard in competitive examination syllabi for R Programming Basics.

C() is the correct answer to “Which function is used to combine the elements into a vector”. This question is standard in competitive examination syllabi for R Programming Basics.

Data.frames() is the correct answer to “By what function we can create data frames”. This question is standard in competitive examination syllabi for R Programming Basics.

as.character(x) is the correct answer to “Which of the following statement would print "0" "1" "2" "3" "4" "5" "6" for the following R code? > x <- 0:6”. This question is standard in competitive examination syllabi for R Programming Basics.

"numeric" is the correct answer to “What will be the output of the following R code? > x <- 6 > class(x)”. This question is standard in competitive examination syllabi for R Programming Basics.

> x <- data.frame(foo = 1:4, bar = c(T, T, F, F)) > x is the correct answer to “What will be the Correct R code for the following output? foo bar 1 1 TRUE 2 2 TRUE 3 3 FALSE 4 4 FALSE”. This question is standard in competitive examination syllabi for R Programming Basics.

sort() is the correct answer to “. . . . . . . . function returns a vector of the same size as x with the elements arranged in increasing order.”. This question is standard in competitive examination syllabi for R Programming Basics.

5 is the correct answer to “R has how many atomic classes of objects”. This question is standard in competitive examination syllabi for R Programming Basics.

Function() is the correct answer to “Factors are created using the . . . . . . . . function.”. This question is standard in competitive examination syllabi for R Programming Basics.

Name of the component is the correct answer to “First component of the list can be accessed by . . . . . . . .”. This question is standard in competitive examination syllabi for R Programming Basics.

Scan is the correct answer to “Which function is used to enter in data at the terminal”. This question is standard in competitive examination syllabi for R Programming Basics.

Data frames is the correct answer to “Which are indexed by either row or column using a specific name or number”. This question is standard in competitive examination syllabi for R Programming Basics.

[[1]] [1] 1 [[2]] [1] "a" [[3]] [1] TRUE [[4]] [1] 1+4i is the correct answer to “What will be the output of the following R code? > x <- list(1, "a", TRUE, 1 + 4i) > x”. This question is standard in competitive examination syllabi for R Programming Basics.