Control Structures in R Programming MCQ question and answer with solution

Section 1 Section 2 Section 3

61.
. . . . . . . . returns TRUE then X can be termed as a matrix data object.

A. is."matrix(X")

B. is.matrix(X)

C. is.notamatrix(X )

D. is.matrix("X")

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62.
. . . . . . . . package provides basic functionalities in R environment like arithmetic calculations, input/output.

A. R base

B. R boost

C. R serve

D. R comm

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63.

What will be the output of the following R code?

> x <- 3
> switch(x, 2+2, mean(1:10), rnorm(5))

A. 2.2903605 2.3271663 -0.7060073 1.3622045 -0.2892720

B. 5.5

C. NULL

D. Error

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64.

What will be the output of the following R code?

> x <- 1:4
> lapply(x, runif)

[[1]]
[1] 0.02778712
[[2]]
[1] 0.5273108 0.8803191
[[3]]
[1] 0.37306337 0.04795913 0.13862825
[[4]]
[1] 0.3214921 0.1548316 0.1322282 0.2213059

[[1]]
[1] 1.02778712
[[2]]
[1] 2.5273108 0.8803191
[[3]]
[1] 3.37306337 0.04795913 0.13862825
[[4]]
[1] 0.3214921 0.1548316 0.1322282 0.2213059

[[1]]
[1] 1.02778712
[[2]]
[1] 0.5273108 0.8803191
[[3]]
[1] 0.37306337 0.04795913 0.13862825
[[4]]
[1] 3.3214921 2.1548316 1.1322282 0.2213059

D. Error

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65.

What will be the output of the following R code?

> x <- c("a", "b", "c", "d")
> for(i in 1:4) {
    + ## Print out each element of 'x'
    + print(x[i])
+ }

A. [1] "a"
[1] "b"
[1] "c"
[1] "d"

B. [1] "c"
[1] "b"
[1] "a"
[1] "d"

C. [1] "d"
[1] "c"
[1] "b"
[1] "a"

D. Error

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66.
. . . . . . . . function gives an error message if the desired package cannot be loaded.

A. Dplyr

B. Require

C. Library

D. Sample

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67.

What will be the output of the following R code?

> x <- list(a = 1:5, b = rnorm(10))
> lapply(x, mean)

A. $a
[1] 3
$b
[1] 0.1322028

B. $a
[1] 4
$b
[1] 0.1322028

C. $a
[1] 5
$b
[1] 0.1322028

D. $a
[2] 5
$b
[1] 3

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68.
Which of the following R code syntax is syntactically valid?

if ( statement1 ) {
    statement2
} else if ( statement3 ) {
    statement4
} else if ( statement5 ) {
    statement6
} else
    statement8

if ( statement1 ) {
    statement2
} elseif ( statement3 ) {
    statement4
} elseif ( statement5 ) {
    statement6
} else
    statement8

if ( statement1 ) {
    statement2
} elseif ( statement3 ) {
    statement4
} else if ( statement5 ) {
    statement6
} else
    statement8

if ( statement1 ) {
    statement2
} else if ( statement5 ) {
    statement6
} else
    statement8

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69.
. . . . . . . . function takes various parameters like formula, data, subset, labels, etc.

A. Pears

B. Pairs

C. Tears

D. Cars

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70.
. . . . . . . . functions can be "built which contain all of the necessary data for evaluating the function.

A. Objective

B. reflective

C. Nested

D. Symmetry

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1 2 3 4 5 6 7 8 9 10

61.
. . . . . . . . returns TRUE then X can be termed as a matrix data object.

Answer & Solution

62.
. . . . . . . . package provides basic functionalities in R environment like arithmetic calculations, input/output.

Answer & Solution

63.
What will be the output of the following R code?

`> x <- 3 > switch(x, 2+2, mean(1:10), rnorm(5))`

Answer & Solution

64.
What will be the output of the following R code?

`> x <- 1:4 > lapply(x, runif)`

Answer & Solution

65.
What will be the output of the following R code?

`> x <- c("a", "b", "c", "d") > for(i in 1:4) { + ## Print out each element of 'x' + print(x[i]) + }`

Answer & Solution

66.
. . . . . . . . function gives an error message if the desired package cannot be loaded.

Answer & Solution

67.
What will be the output of the following R code?

`> x <- list(a = 1:5, b = rnorm(10)) > lapply(x, mean)`

Answer & Solution

68.
Which of the following R code syntax is syntactically valid?

Answer & Solution

69.
. . . . . . . . function takes various parameters like formula, data, subset, labels, etc.

Answer & Solution

70.
. . . . . . . . functions can be "built which contain all of the necessary data for evaluating the function.

Answer & Solution

Read More Section(Control Structures in R Programming)

Control Structures in R Programming MCQ question and answer with solution | R Programming MCQs

61. . . . . . . . . returns TRUE then X can be termed as a matrix data object.

Answer & Solution

62. . . . . . . . . package provides basic functionalities in R environment like arithmetic calculations, input/output.

Answer & Solution

63. What will be the output of the following R code? > x <- 3 > switch(x, 2+2, mean(1:10), rnorm(5))

Answer & Solution

64. What will be the output of the following R code? > x <- 1:4 > lapply(x, runif)

Answer & Solution

65. What will be the output of the following R code? > x <- c("a", "b", "c", "d") > for(i in 1:4) { + ## Print out each element of 'x' + print(x[i]) + }

Answer & Solution

66. . . . . . . . . function gives an error message if the desired package cannot be loaded.

Answer & Solution

67. What will be the output of the following R code? > x <- list(a = 1:5, b = rnorm(10)) > lapply(x, mean)

Answer & Solution

68. Which of the following R code syntax is syntactically valid?

Answer & Solution

69. . . . . . . . . function takes various parameters like formula, data, subset, labels, etc.

Answer & Solution

70. . . . . . . . . functions can be "built which contain all of the necessary data for evaluating the function.

Answer & Solution

Read More Section(Control Structures in R Programming)

61.
. . . . . . . . returns TRUE then X can be termed as a matrix data object.

62.
. . . . . . . . package provides basic functionalities in R environment like arithmetic calculations, input/output.

63.
What will be the output of the following R code?

`> x <- 3 > switch(x, 2+2, mean(1:10), rnorm(5))`

64.
What will be the output of the following R code?

`> x <- 1:4 > lapply(x, runif)`

65.
What will be the output of the following R code?

`> x <- c("a", "b", "c", "d") > for(i in 1:4) { + ## Print out each element of 'x' + print(x[i]) + }`

66.
. . . . . . . . function gives an error message if the desired package cannot be loaded.

67.
What will be the output of the following R code?

`> x <- list(a = 1:5, b = rnorm(10)) > lapply(x, mean)`

68.
Which of the following R code syntax is syntactically valid?

69.
. . . . . . . . function takes various parameters like formula, data, subset, labels, etc.

70.
. . . . . . . . functions can be "built which contain all of the necessary data for evaluating the function.