Infosys interview puzzles with Answers

Puzzle 1 :  9 cards are there. u have to arrange them in a 3*3 matrix. cards are of 4 colors.they are red,yellow,blue,green. conditions for arrangement: one red card must be in first row or second row.2 green cards should be in 3rd column. Yellow cards must be in the 3 corners only. Two blue cards must be in the 2nd row. Atleast one green card in each row.

Answer :

                        Yello     Red        Green
                         Blue     Blue        Green
                         Yellow Green     Yellow
 

Puzzle 2 :   In a soap company a soap is manufactured with 11 parts. For making one soap you will get 1 part as scrap. At the end of the day u have 251 such scraps. From that how many soaps can be manufactured?

Answer :  22 + 2+ 1 = 25.

Puzzle 3 : There are five thieves, each loot a bakery one after the other such that the first one takes 1/2 of the total no. of the breads plus 1/2 of a bread. Similarly 2nd, 3rd,4th and 5fth also did the same. After the fifth one no. of breads remained are 3. Initially how many breads were there?

Answer :  31

Puzzle 4 : Two candles of equal lengths and of different thickness are there. The thicker one will last of six hours. The thinner 2 hours less than the thicker one. Ramesh light the two candles at the same time. When he went to bed he saw the thicker one is twice the length of the thinner one. For how long did Ramesh lit two candles .

Answer : 3 hours

Puzzle 5 : There are 5 persons who have won top 5 places in an event Olympics one of them asks all the 5 regarding their positions they reply as a: I am not the last b: c is in third place c: e is behind a d: b is in 1st place e: d is not the first find positions in order.

Answer  :  bdcae

Puzzle 6 :  If one tyre of a car suddenly gets stolen…. and after sometime u find the tyre without the screws how will u make ur journey complete?

Answer : Open 3 screws, 1 from each tyre and fix the tyre.

Puzzle 7 : How will you recognize the magnet & magnetic material & non-magnetic material?

Answer : Drag one piece of material over another. There is no attractive force in the middle portion of the magnet. OR Get a piece of thread and tie up with the one bar and check for poles. If it iron bar then it moves freely and if it is magnetic bar then it fix in one direction according to poles.

Puzzle 8 : You are given a cake; one of its corner is broken. How will u cut the rest into Two equal parts?

Answer :  Slice the cake

Puzzle 9 : What is the height of room if after entering the room with a watch ur head strikes a hanging bulb?
Answer: Oscillate the hanging bulb. Calculate the time period for one complete oscillation by Simple Harmonic Motion (SHM) of the handing bulb. Put it in the
formula T=2 * 3.14 * (L/G)^1/2

L will be the length of the hanging thread.
Add the L with ur height to get the height of the room.

OR
Drop it from the room and find the time at which it strikes the floor. Using physics formula s = (at^2)/2 (IM NOT SURE ABOUT THIS ONE)
Puzzle 10 : Can u make 120 with 5 zeros?
Answer :  Factorial (factorial (0)+factorial (0)+factorial (0)+factorial (0)+factorial (0)) = 120

Puzzle 11 :  There are three people A, B, C. Liars are of same type and Truth speaking people are of same type. Find out who is speaking truth and who is speaking false from the following statements:

a) A says: B is a liar.
b) B says: A and C are of same type.

Answer : lets assume A is speaking truth. It means B is a liar then it means A and C are not of same type.

Puzzle 12 : Ann, Boobie, Cathy and Dave are at their monthly business meeting.  Their occupations are author, biologist, chemist and doctor, but not  necessarily in that order.  Dave just told the biologist that Cathy was on her way with doughnuts.  Ann is sitting across from the doctor and next to the chemist. The  doctor was thinking that Boobie was a goofy name for parent's to choose,but didn't say anything. What is each person's occupation?

Answer:  Since Dave spoke to the biologist and Ann sat next to the chemist and across the doctor, Cathy must be the author and Ann the biologist. The doctor didn't speak, but David did, so Bobbie is the doctor and Dave the chemist.