Control Structures in R Programming MCQ question and answer with solution

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Each section contains 100 MCQs on Control Structures in R Programming .

Which of the following R code will print "Hello, world!"?

> f <- function() {
+              cat("Hello, world!\n")
+ }
> f()

>  f <- function() {
+              cat("Hello, World!\n")
+ }
< f()

> f <- function() {
+             cat("Hello world!\n")
+ }
>>= f()

> f <- function() {
-             cat("Hello world!\n")
+ }
<= f()

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

What will be the output of the following R code snippet?

> f <- function(a, b) {
+              print(a)
+              print(b)
+ }
> f(45)

A) 32 B) 42 C) 52 D) 45

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

The syntax of the repeat loop is . . . . . . . .

A) rep statement B) repeat statement C) repeat else D) repeat while

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

In the base graphics system, which function is used to add elements to a plot?

A) Boxplot() B) Text() C) Boxplot() or Text() D) Treat()

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Which of the following R code generate a uniform random number?

x <- runif(1, 0, 10)
if(x > 3) {
    y <- 10
} else {
    y <- 0
}

x <- run(1, 0, 10)
if(x > 3) {
    y <- 10
} else {
    y <- 0
}

x <- random(1, 0, 10)
if(x > 3) {
    y <- 10
} else {
    y <- 0
}

x <- random(1, 0, 10)
if(x > 1) {
    y <- 0
} else {
    x <- 0
}

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Which function is used to select variables and observations from a given dataset?

A) Subset() B) Sample() C) While() D) Signal()

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Point out the correct statement?

A) The search list can be found by using the searchlist() function B) The search list can be found by using the search() function C) The global environment or the user's workspace is always the second element of the search list D) R has separate namespaces for functions and non-functions

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Point out the wrong statement?

A) Statements cannot be grouped together using braces '{' and '}' B) Computation in R consists of sequentially evaluating statements C) Single statements are evaluated when a new line is typed at the end of the syntactically complete statement D) next is used to skip an iteration of a loop

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

What will be the output of the following R code?

> printmessage <- function(x) {
+ if(x > 0)
+         print("x is greater than zero")
+ else
+         print("x is less than or equal to zero")
+ invisible(x)
+ }
> printmessage(1)

A) Error B) Warning C) Messages D) 0

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

. . . . . . . . is an indication that a fatal problem has occurred and execution of the function stops.

A) message B) error C) warning D) message & warning

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

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