152) You want to check whether a given set of items is sorted. Which of the following sorting methods will be most efficient if it is already in sorted order

153) The average number of comparisons performed by the merge sort algorithm, in merging two sorted liss of length 2 is

154) Which of the following sorting methods will be the best if number of swappings done, is the only measure of efficiency

155) You are asked to sort 15 randomly generated numbers. You should prefer

156) As part of the maintenance work, you are entrusted with the work of rearranging the library books in a shelf in proper order, at the end of each day. The ideal choice will be