Vertitime Quiz

1. What type of language is R?

Compiled
Interpreted
Markup
Assembly

2. Which symbol is used for assignment in R?

=
<-
:=
==

3. Which function reads a CSV file?

read.csv()
load.csv()
import()
open()

4. Default string data type in R?

numeric
logical
character
factor

5. Function to see object structure?

view()
summary()
str()
class()

6. Which can store different data types?

Vector
Matrix
Data frame
Array

7. Install packages using?

library()
install.packages()
require()
load()

8. NA means?

Zero
Infinite
Missing value
Error

9. Logical AND operator?

&
&&
|
!

10. Length of vector?

size()
length()
count()
dim()

31. Which function finds mean?

avg()
mean()
median()
sum()

32. Which function finds median?

mean()
avg()
median()
mid()

33. Which function finds standard deviation?

var()
sd()
mean()
sqrt()

34. Which operator is NOT logical?

&
|
!
+

35. Which function creates a vector?

vector()
c()
list()
seq()

36. Which function combines data frames?

merge()
bind()
join()
attach()

37. Which function shows last rows?

tail()
end()
bottom()
last()

38. What does rm() do?

Rename object
Remove object
Read object
Restore object

39. Which package is used for data manipulation?

ggplot2
dplyr
lattice
shiny

40. Which function converts data to factor?

as.numeric()
as.factor()
factorize()
convert()

41. Which function repeats values?

rep()
repeat()
loop()
for()

42. Which data type stores TRUE/FALSE?

numeric
character
logical
factor

43. Which function creates matrix?

mat()
matrix()
array()
table()

44. Which function checks missing values?

is.na()
check.na()
na.test()
missing()

45. What does dim() return?

Length
Dimensions
Data type
Summary

46. Which function writes CSV file?

save.csv()
write.csv()
export.csv()
print.csv()

47. What does class() return?

Size
Data type
Object class
Value

48. Which symbol is used for indexing?

{}
()
[]
<>

49. Which function stops execution?

stop()
end()
break()
exit()

50. Which IDE is commonly used for R?

Eclipse
RStudio
NetBeans
PyCharm