Aptitude Questions and Answers for PLACEMENTS

Ques. There are 10 yes or no questions. How many ways can these be answered?
Op 1: 1084
Op 2: 2048
Op 3: 1024
Op 4: 100
Op 5:
Correct Op : 3

Ques. If the letters of the word CHASM are rearranged to form 5 letter words such that none of the word repeat and the results arranged in ascending order as in a dictionary what is the rank of the word CHASM?
Op 1: 24
Op 2: 31
Op 3: 32
Op 4: 30
Op 5:
Correct Op : 3

Ques. A bag contains 4 white, 5 red and 6 blue balls. Three balls are drawn at random from the bag. The probability that all of them are red, is:
Op 1: 1/22
Op 2: 3/22
Op 3: 2/91
Op 4: 2/77
Op 5:
Correct Op : 3


Ques. A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random from this box. The probability that at least one of these is defective, is:
Op 1: 4/19
Op 2: 7/19
Op 3: 12/19
Op 4: 21/95
Op 5:
Correct Op : 2