R Programming Mock Test 3

10%

Question 1 of 10

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

> x <- factor(c("yes", "yes", "no", "yes", "no"))
> table(x)

 
yes yes
6 2

 
no yes
2 2

 
yes no
2 3

 
no yes
2 3

Question 1 of 10

Question 2 of 10

2. Density function gives output as ________

Vector

Number

Matrix

Lists

Question 2 of 10

Question 3 of 10

3. Which is the basic data structure of R containing the same type of data?

Vector

Array

Functions

Lists

Question 3 of 10

Question 4 of 10

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

> x <- list(1, "a", TRUE, 1 + 4i)
> x

[[1]]
[1] 77

[[2]]
[1] "a"

[[3]]
[1] False

[[4]]
[1] 1+5i

[[1]]
[1] 1

[[2]]
[1] "a"

[[3]]
[1] TRUE

[[4]]
[1] 1+4i

[[1]]
[1] 3

[[2]]
[1] "a"

[[3]]
[1] TRUE

[[4]]
[1] 1+4i

[[1]]
[1] 2

[[2]]
[1] "b"

[[3]]
[1] TRUE

[[4]]
[1] 1+4i

Question 4 of 10

Question 5 of 10

5. Which of the following is used for reading tabular data?

> y <- data.frame(a = 1, b = "a")
> dput(y, file = "y.R")
> new.y <- dget("y.R")
> new.y

a b
1 2 b

a b
1 1 a

a b
2 1 a

b a
1 a a

Question 5 of 10

Question 6 of 10

6. To extract a sublist, we use _________ brackets.

Square

Single

Flower

Double

Question 6 of 10

Question 7 of 10

7. Which function can be used to determine the names assigned to a list?

Nam

Name

Nem

Names

Question 7 of 10

Question 8 of 10

8. Factors are the r-objects which are created using a _________

Matrix

Lists

Vector

Array

Question 8 of 10

Question 9 of 10

9. First component of the list can be accessed by _____________

List name

Package

Name of the component

Function

Question 9 of 10

Question 10 of 10

10. Using the ________ vector, we create a species factor and bind it to the columns of iris.df.

rnames

snames

fnames

jnames

Question 10 of 10