R Programming Mock Test 2

10%

Question 1 of 10

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

ab <- list(1, 2, 3, "X", "Y", "Z")
dim(ab) <- c(3,2)
print(ab)

1   “W”
2   “Y”
3   “ Z”

Error

1   “X”
2   “Y”
3   “ Y”

1   “X”
2   “Y”
3   “ Z”

Question 1 of 10

Question 2 of 10

2. What is the meaning of the following R function?

x <- c(4, 5, 1, 2, 3, 3, 4, 4, 5, 6)
x <- as.factor(x)

x becomes a factor

x does not exist

x is not a vector

x is a factor

Question 2 of 10

Question 3 of 10

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

 > m <- matrix(nrow = 2, ncol = 3)
 > dim(m)

3 2

2 3

4 5

2 2

Question 3 of 10

Question 4 of 10

4. In the expression x <- 4 in R, what is the class of 'x' as determined by the `class()' function?

Character

Word

Numeric

Integer

Question 4 of 10

Question 5 of 10

5. What will be the output of the following R function?

d <- diag(5, nrow=2, ncol=2)
d

       5    1
       0    5

       5    0
       0    5

       5    0
       5    5

       5    0
       15    5

Question 5 of 10

Question 6 of 10

6. The ________ function can be used to create vectors of objects by concatenating things together.

con()

concat()

c()

cp()

Question 6 of 10

Question 7 of 10

7. Point out the wrong statement?

R does not support multi-line comments or comment blocks

The grammar of the language determines whether an expression is complete or not

The ## character indicates a comment

The <- symbol is the assignment operator in R

Question 7 of 10

Question 8 of 10

8. _______ will divert all subsequent output from the console to an external file.

sink

div

exp

exc

Question 8 of 10

Question 9 of 10

9. Collection of objects currently stored in R is called as ________________

package

list

workspace

task

Question 9 of 10

Question 10 of 10

10. Scripts will run on ___________________

Script Editors

Console

Terminal

GCC Compiler

Question 10 of 10