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Welcome to the Control Structures and Functions MCQs Page

Dive deep into the fascinating world of Control Structures and Functions with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Control Structures and Functions, a crucial aspect of R Programming. In this section, you will encounter a diverse range of MCQs that cover various aspects of Control Structures and Functions, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within R Programming.

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Check out the MCQs below to embark on an enriching journey through Control Structures and Functions. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of R Programming.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Control Structures and Functions. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Control Structures and Functions MCQs | Page 1 of 13

Explore more Topics under R Programming

Q1.
Which of the following is valid syntax for if else statement in R?

a.

if(<condition>) {
## do something
}
else {
## do something else
}

b.

if(<condition>) {
## do something
}
elseif {
## do something else
}

c.

if(<condition>) {
## do something
}
else if {
## do something else
}

d.

if(<condition>) {
##& do something
}
else {
##@ do something else
}

Discuss
Answer: (a).if(<condition>) {
## do something
}
else {
## do something else
}
Q2.
Point out the correct statement?

a.

Blocks are evaluated until a new line is entered after the closing brace

b.

Single statements are evaluated when a new line is typed at the start of the syntactically complete statement

c.

The if/else statement conditionally evaluates two statements

d.

Break will execute a loop while a condition is true

Discuss
Answer: (c).The if/else statement conditionally evaluates two statements
Q3.
Which of the following R syntax is correct for while loop?

a.

while ( statement1 ) statement2

b.

while ( statement1 ) else statement2

c.

while ( statement1 ) do statement2

d.

while ( statement2 ) doelse statement2

Discuss
Answer: (a).while ( statement1 ) statement2
Q4.
Which of the following R code generate a uniform random number?

a.

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

b.

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

c.

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

d.

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

Discuss
Answer: (a).x <- runif(1, 0, 10)
if(x > 3) {
y <- 10
} else {
y <- 0
}
Q5.
Point out the wrong statement?

a.

for will execute a loop a fixed number of times

b.

break will execute a loop while a condition is true

c.

if and else tests a condition and acting on it

d.

break is used to break the execution of a loop

Discuss
Answer: (b).break will execute a loop while a condition is true
Q6.
_______ is used to break the execution of a loop.

a.

next

b.

skip

c.

break

d.

delete

Discuss
Answer: (c).break
Q7.
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]

Discuss
Answer: (c).> for(i in 1:10) {
+ print(i)
+ }
[1]
Q8.
Which of the following statement can be used to explicitly control looping?

a.

if

b.

while

c.

break

d.

for

Discuss
Answer: (c).break
Q9.
Which of the following should be preferred for evaluation from list of alternatives?

a.

subsett

b.

eval

c.

switch

d.

set

Discuss
Answer: (b).eval
Q10.
What will be the output of the following R code? 
> x <- c("a", "b", "c", "d")
> for(i in 1:4) {
    + ## Print out each element of 'x'
    + print(x[i])
+ }

a.

[1] "a"
[1] "b"
[1] "c"
[1] "d"

b.

[1] "c"
[1] "b"
[1] "a"
[1] "d"

c.

[1] "d"
[1] "c"
[1] "b"
[1] "a"

d.

Error

Discuss
Answer: (a).[1] "a"
[1] "b"
[1] "c"
[1] "d"
Page 1 of 13

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