R Programming Basics MCQ

Test your knowledge with important R Programming Basics MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more R Programming Basics MCQs at Bissoy

• The . . . . . . . . function creates a regular sequence of values to form a vector.
  ক

  sequel

  খ

  Rep

  গ

  seq

  ঘ

  Grep
• The . . . . . . . . stores the nominal values as a vector of integers in the range of 1 to unique values in the nominal variable.
  ক

  Factor

  খ

  Matrix

  গ

  Lists

  ঘ

  Functions
• The first component can be accessed using . . . . . . . . operator.
  ক

  Intraction

  খ

  Extraction

  গ

  AND

  ঘ

  OR
• If you explicitly want an integer, you need to specify the . . . . . . . . suffix.
  ক

  D

  খ

  R

  গ

  L

  ঘ

  K
• Factors are the r-objects which are created using a . . . . . . . .
  ক

  Vector

  খ

  Matrix

  গ

  Lists

  ঘ

  Array
• Which of the following is a valid assignment?
  ক

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

  খ

  > m <- matrix(nrow = 2, ncol = 3.5)

  গ

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

  ঘ

  > m <- mat(nrow = 2, ncol = 5)
• Which of the following is valid assignment?
  ক

  > x <- fact(c("yes", "yes", "no", "yes", "no"))

  খ

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

  গ

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

  ঘ

  > x <- factor(factor("yes", "no", "no", "yes", "no"))
• The data type of the R-object becomes the data type of the . . . . . . . .
  ক

  Functions

  খ

  Packages

  গ

  Variables

  ঘ

  Lists
• . . . . . . . . are similar to matrices but can have more than two dimensions.
  ক

  Functions

  খ

  Packages

  গ

  Arrays

  ঘ

  Columns
• Attributes of an object (if any) can be accessed using the . . . . . . . . function.
  ক

  objects()

  খ

  attrib()

  গ

  attributes()

  ঘ

  obj()
• In R using the function, . . . . . . . . one can check the data type of vector.
  ক

  Typeof()

  খ

  Castof()

  গ

  Function()

  ঘ

  C()
• R objects can have attributes, which are like . . . . . . . . for the object.
  ক

  metadata

  খ

  features

  গ

  expression

  ঘ

  dimensions
• Joining two lists can be achieved either using the . . . . . . . . function.
  ক

  Concat

  খ

  Join

  গ

  Reduce

  ঘ

  Delete
• Lists can be created using the . . . . . . . . function.
  ক

  Matrix.li

  খ

  Matrix.lists

  গ

  Lists.matric

  ঘ

  List
• Data frames can be converted to a matrix by calling data . . . . . . . .
  ক

  as.matr()

  খ

  as.mat()

  গ

  as.matrix()

  ঘ

  as.max()
• A . . . . . . . . is an R-object which can contain many different types of elements inside it.
  ক

  Vector

  খ

  Lists

  গ

  Matrix

  ঘ

  Functions
• Accessing elements is achieved through a process called . . . . . . . .
  ক

  Indexing

  খ

  Outdexing

  গ

  Highlighting

  ঘ

  Scrapping
• A data frame is a special type of list where every element of the list has . . . . . . . . length.
  ক

  Same

  খ

  Different

  গ

  May be different

  ঘ

  May be same
• Computation with vectors is achieved using an element-by-element operation for avoiding . . . . . . . .
  ক

  Loops

  খ

  Functions

  গ

  Packages

  ঘ

  Interfaces
• First component of the list can be accessed by . . . . . . . .
  ক

  Name of the component

  খ

  List name

  গ

  Function

  ঘ

  Package
• Factors are created using the . . . . . . . . function.
  ক

  C()

  খ

  Function()

  গ

  Array()

  ঘ

  Lists()
• . . . . . . . . function returns a vector of the same size as x with the elements arranged in increasing order.
  ক

  sort()

  খ

  orderasc()

  গ

  orderby()

  ঘ

  sequence()
• What will be the Correct R code for the following output?<br><pre><code class="r">foo bar1 1 TRUE2 2 TRUE3 3 FALSE4 4 FALSE</code></pre>
  ক

  &gt; x &lt;- data.frame(foo = 1:4, bar = c(F, T, F, F))<br>&gt; x

  খ

  &gt; x &lt;- data.frame(foo = 1:6, bar = c(F, T, F, F))<br>&gt; x

  গ

  &gt; x &lt;- data.frame(foo = 1:4, bar = c(T, T, F, F))<br>&gt; x

  ঘ

  &gt; x &lt;- data.frame(foo = 14:1, bar = c(F, T, F, F))<br>&gt; x
• Which of the following statement would print "0" "1" "2" "3" "4" "5" "6" for the following R code?<br><pre><code class="r">&gt; x &lt;- 0:6</code></pre>
  ক

  as.character(x)

  খ

  as.logical(x)

  গ

  as.numeric(x)

  ঘ

  as.num(y)
• A . . . . . . . . is a two-dimensional rectangular data set.
  ক

  Vector

  খ

  Lists

  গ

  Matrix

  ঘ

  Functions
• Which of the following is invalid assignment?
  ক

  &gt; x &lt;- list("Los Angeles" = 1, Boston = 2, London = 3)

  খ

  &gt; names(x) &lt;- c("New York", "Seattle", "Los Angeles")

  গ

  &gt; name(x) &lt;- c("New York", "Seattle", "Los Angeles")

  ঘ

  &gt; names(x) &lt;- c("New York", "Los Angeles", "Los Angeles")
• Using the . . . . . . . . vector, we create a species factor and bind it to the columns of iris.df.
  ক

  snames

  খ

  rnames

  গ

  jnames

  ঘ

  fnames
• To extract a sublist, we use . . . . . . . . brackets.
  ক

  Flower

  খ

  Square

  গ

  Double

  ঘ

  Single
• Numbers in R are generally treated as . . . . . . . . precision real numbers.
  ক

  single

  খ

  double

  গ

  real

  ঘ

  imaginary
• Locator function gives output as . . . . . . . .
  ক

  Matrix

  খ

  Lists

  গ

  Vector

  ঘ

  Number