R Programming Mock Test 6

10%

Question 1 of 10

1. The cumulative frequency distribution of a categorical variable can be checked using the ________ function in R language.

Lumpsum

Cumsum

Resum

Sum

Question 1 of 10

Question 2 of 10

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

> g <- function(x) {
+             a <- 3
+             x+a+y
+          ## 'y' is a free variable
+ }
> g(2)

Error

Question 2 of 10

Question 3 of 10

3. Which of the following language supports lexical scoping?

Python

Common Lisp

Perl

All of the mentioned

Question 3 of 10

Question 4 of 10

4. The _________ function is a kind of “constructor function” that can be used to construct other functions.

make.power()

keep.pow()

make.pow()

keep.power()

Question 4 of 10

Question 5 of 10

5. Which of the following R code will print the following result?

[[1]]
[1] 2.263808
[[2]]
[1] 1.314165 9.815635
[[3]]
[1] 3.270137 5.069395 6.814425
[[4]]
[1] 0.9916910 1.1890256 0.5043966 9.2925392

> x <- 1:4
> lapply(x, runif, min = 0, max = 10)

> x <- 1:3
> lapply(x, runif, min = 0, max = 10)

> x <- 1:4
> lapply(x, runif, min = 0, max = 9)

> x <- 1:4
> lapply(x, runif, min = 0, max = 6)

Question 5 of 10

Question 6 of 10

6. Which of the variable in the following R code is variable?

> f <- function(x, y) {
+            x^2 + y / z
+ }

Question 6 of 10

Question 7 of 10

7. Point out the correct statement?

Functions that you pass to lapply() may have other arguments

lapply() takes elements of the list and passes them as the first argument of the function you are applying

None of the mentioned

You can use lapply() to evaluate a function multiple times each with a different argument

Question 7 of 10

Question 8 of 10

8. How will you check if an element is present in a vector?

Dismatch()

Search()

Mismatch()

Match()

Question 8 of 10

Question 9 of 10

9. The line of code in R language should begin with a ________________

Number

Alphabet

Character

Hash symbol

Question 9 of 10

Question 10 of 10

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

> lm <- function(x) { x * x }
> lm

func(x) { x * x }

function(x) { x / x }

function(x) { x * x }

function { x $ x }

Question 10 of 10