Page 244 - Data Science class 11
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10.  Which function can be used to return the square root of a number?
              a.  sqrt()                                         b.  square_root()

              c.  sqroot()                                       d.  sr()
           11.  What is the correct way to create a vector of strings?
              a.  fruits <- c(“banana”, “apple”, “orange”)

              b.  fruits <- v(“banana”, “apple”, “orange”)
              c.  fruits <- list(“banana”, “apple”, “orange”)

              d.  fruits <- listOf(“banana”, “apple”, “orange”)
           12.  What is the correct way to create a list of strings?
              a.  fruits <- c(“banana”, “apple”, “orange”)

              b.  fruits <- vectorOf(“banana”, “apple”, “orange”)
              c.  fruits <- list(“banana”, “apple”, “orange”)

              d.  fruits <- v(“banana”, “apple”, “orange”)
           13.  Which function can be used to create a data frame?
              a.  dataframe()                                    b.  df()

              c.  dframe()                                       d.  data.frame()
           14.  Which function is used to add additional columns to a matrix?
              a.  append_item()                                  b.  cbind()

              c.  add()                                          d.  join()

           15.  How do you start writing an if statement in R?
              a.  if (x > y)                                     b.  if x > y:
              c.  if x > y then:                                 d.  None of these

           16.  Which function is used to find the number of rows and columns in an array?
              a.  dim_len()                                      b.  dim()
              c.  length()                                       d.  nchar()

        B.  Fill in the blanks.

            1.  The structure of the data frame can be seen using the ______________________ function.
            2.  The ______________________ function is used to calculate the sum of the elements in the rows of an array across all the
              matrices.
            3.  ______________________ are the R data objects in which we can store data in more than two dimensions.

            4.  The ______________________ parameter when set to TRUE in a matrix, the elements in the input vector are organised by
              row.
            5.  When ______________________ indexing is used, the elements of the vector are ignored.
        C.  State whether these statements are true or false.

            1.  List is a type of R object that contains different types of elements like-numbers, vectors, strings,
              and another list within it.                                                              ____________




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