Control Structures in R Programming MCQ question and answer with solution

1

Which of the following should be preferred for evaluation from list of alternatives?

A) subsett B) eval C) switch D) set

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Answer & Solution

Answer: Option B

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2

What will be the class of the vector if you concatenate a number and a character?

A) Number B) Character C) Integer D) No class

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Answer & Solution

Answer: Option B

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3

Which of the following R code snippet stops loop after 20 iterations?

A)

for(i in 1:100) {
      print(i)
              if(i > 20) {
               break 
       } 
}

B)

for(i in 1:100) {
      print(i)
              if(i > 19) {
               break 
       } 
}

C)

for(i in 1:100) {
      print(i)
              if(i < 20) {
               break 
       } 
}

D)

for(i in 2:100) {
      print("i")
              if(i > 150) {
               break 
       } 
}

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Answer & Solution

Answer: Option A

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4

. . . . . . . . package is used to speed up data frame management code.

A) Data.table B) Dplyr C) Table D) Data.dplyr

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Answer & Solution

Answer: Option B

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5

Which of the following is multivariate version of lapply?

A) apply() B) lapply() C) sapply() D) mapply()

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Answer & Solution

Answer: Option D

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6

Functions are defined using the . . . . . . . . directive and are stored as R objects.

A) function() B) funct() C) functions() D) fun()

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Answer & Solution

Answer: Option A

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7

MapReduce jobs submitted from either Oozie, Pig or Hive can be used to encode, improve and sample the data sets from . . . . . . . . into R.

A) HDLS B) HDFS C) HDLSV D) HSSLV

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Answer & Solution

Answer: Option B

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8

What will be the output of the following R code?

> y <- "fruit"
> switch(y, fruit = "banana", vegetable = "broccoli", "Neither")

A) "banana" B) "Neither" C) "broccoli" D) Error

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Answer & Solution

Answer: Option A

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9

Which of the following R code generate a sequence of integers from 1 to 10?

A)

> for(i in 1:9) {
    + print(i)
+ }
[1]

B)

> for(i in 0:9) {
    + print(i)
+ }
[1]

C)

> for(i in 1:10) {
    + print(i)
+ }
[1]

D)

> for(i in 2:50) {
    + print("i")
+ }
[1]

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Answer & Solution

Answer: Option C

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10

. . . . . . . . function is usually used inside another function and throws a warning whenever a particular package is not found.

A) Dplyr B) Require C) Coin D) Sample

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Answer & Solution

Answer: Option B

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