INFOSYS QUESTIONS AND ANSWERS

Totally 9 Questions. - 50 marks. > > 1) There is a five digit number. > The fifth digit is one fourth of the third digit and > one half of the fourth digit. Third digit is one half of the first digit. > second digit is 5 more than the fifth digit. > What is that 5 digit no.? > Ans. 86421 > 2) There are three associates and they have some money in a room. > But no one is believing others alone. so, > a) No one should be able to open the room alone. > b) When any 2 persons are combined they should be able to open the room. > What is the minimun no. of locks & keys required.? (5M) > Ans. 3 Locks and 2 keys of Each Lock ( 6Keys) Explanation: Let Three person is x,y,z And Lock are A B C then x have key of A and B y have B and C z have C and A > 3) A simple racing prob. like Samantha beat Jim. Jack lost to Jim. John was not last. > And the prob goes like this... (simple) > Ans. samantha > 4) A boy goes to school from his house.on one fourth oh his way to school, he crosses a > machinery station. And on one third of his way to school, he crosses a Railway station. > He crossed the machinery station at 7:30 and he crosses the Railway station at 7:35. > when does he leave the house & when does he reach the school ? (5M) > Ans. Starting Time 7:15 and arrival at School 8:15 > 5) An Eraser,Pencil,Notebook together costs $1.00. Notebook costs more than the cost of > 2 Pencils. 3 Pencil costs more than 4 Erasers. 3 Erasers costs more than a Notebook. > How much does a pencil costs? (5M) > Ans. Pencil $0.26, Eraser 0.19, Notebook 0.55 > 6) I can't remember the prob. fully. (* Check this in previous questions. Its there!) > Old Problem with three inhabitants of three castes. Abhor,Magar & Dravid. (8M) > 1) Abhor women cannot marry Dravid man. > 2) Dravid women cannot marry Magar man. > 3) Male child gets the father's caste and female child gets the mother's caste. > 4) all other marriages are allowed. > 5) ... > > 4 questions related with this...each of 2 marks... like... > > 1) A magar man can have ... > a) a dravid grandmother. > b) a abhor mother. > c).... > > 7) Series... > > a) 3,6,13,26,33,66, ? Ans. 73, 146 ..... Explanation 3*2 = 6 6+7 = 13 13*2 = 26 26+7 = 33 33*2 = 66 > b) 364, 361, 19, 16, 4, 1, ? > Ans 1, -2 Exp: 364 - 3 = 361 sqrt(361) = 19 19 -3 = 16 sqrt(16) = 4 4 - 3 = 1 > 8) A large cube is painted on all sides with Red color. It is then cut into 27 small cubes. > How many sides of the cube will have... > a) 3 red faces. Ans. 8 > b) 2 red faces. Ans 12 > c) 1 red face. Ans 6 > d) No red faces. (8M) Ans 1 > > 9) Four persons A,B,C,D were there. All were of different weights. All Four gave a > statement.Among the four statements only the person who is lightest in weight of all > others gave a true statement. > > A Says : B is heavier than D. > B Says : A is heavier than C. > C Says : I am heavier than D. > D Says : C is heavier than B. > > Find the lightest & List the persons in ascending order according to their weights. (5M) > > Ans: A speaks true and others speek false so order is A,C,D,B( heaviest)