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Home » Placement Papers » Infosys Placement Papers » Infosys Placement Paper 90

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Infosys Placement Paper 90


Infosys Placement Papers

INFOSYS-Placement Paper-30 June 2006-Vizag

1) Consider a pile of Diamonds on a table. A thief enters and steals 1/2 of the total quantity and then again 2 extra from the remaining. After some time a second thief enters and steals 1/2 of the remaining+2. Then 3rd thief enters and steals 1/2 of the remaining+2. Then 4th thief enters and steals 1/2 of the remaining+2. When the 5th one enters he finds 1 diamond on the table. Find out the total no. of diamonds originally on the table before the 1st thief entered.
Let initially X diamonds
After first thief left remaining diamonds r (x-4)/2 ie) x/2 - 2
After second thief left remaining diamonds r (x-12)/4
After third thief left remaining diamonds r (x- 28)/8
After fourth thief left remaining diamonds r (x-60)/16
Given After fourth thief left remaining diamonds r one
(x-60)/16 = 1 ie) x-60 = 16 ie) x = 76

2)There are two taps, which are used to fill the tank and one tap to empty the tank. First tap fill the tank in 10 min., while the second takes quarter of an hour to fill the tank if both are operated independently. Third tap is capable of emptying the tank in seven and a half minutes. If all the taps are opened simultaneously (when the tank is empty) how long (if ever) will it take for the tank to get filled completely?
Let the amt of work be X
A can fill in 10 min, in 1 min 1x/ 10th work of filling
B can fill in quarter of an hour ie) in 1 min 1x/15th work
C can unfill in 7 1/2 min ie) in 1 min 2x/15th work
If all work together 1x/10 + 1x/15 - 2x/15 = x
Solve x = 30 min

3)clark, jones, mason, smith are 4 ppl. there are 4 professions druggists, grocer, butcher, policeman. find out who is who?
1)clark and jones are neighbours and they drive each other to work.
2)jones earns more than mason
3) the police man earns more than the druggists and i "think" the grocer.
4) the policeman does not have a druggists as a neighbour.
5) the butcher walks to work
6)policeman does not meet the grocer until he arrests him for commiting an offence
I was confused I dint get right one .

4)An artist has exactly seven paintings --- ,T,U,V,W,X,Y, and Z -- from which she must choose exactly five to be in an exhibit. Any combination is acceptable provided it meets the following conditions:
* If T is chosen , X cannot be chosen
* If U is chosen , Y must also be chosen
* If V is chosen , X must also be chosen

1) Which one of the following is an acceptable combination of paintings for inclusion in the exhibit?
A. T,U,V,X,Y
B. T,U,V,Y,Z
C. T,W,X,Y,Z
D. U,V,W,Y,Z
E. U,V,W,Z,Y
Ans E
When T is present X shud be excluded so above cases failed. When V is there X must be there so

2) If painting T is chosen to be among the paintings included in the exhibit which one of the following cannot be chosen to be among the paintings included in the exhibit?
A. U
B. V
C. W
D. Y
E. Z
Ans B
when T is there X not there, so if u include V it brings X along with it

3)Which one of the following substitutions can the artist always make without violating restrictions affecting the combination of paintings given that the painting mentioned first was not, and the painting mentioned first was not, and the painting mentioned second was, originally going to be chosen ?
A. T replaces V
B. U replaces Y
C. V replaces X
D. W replaces Y
E. Z replaces W
Ans E
There r no such conditions for Z and W ,they can be selected as u want.

4) If the artist chooses painting V to be included among the paintings in the exhibit, which one of the following must be true of that combination of paintings?
A. T is not chosen
B. Y is not chosen
C. U is chosen
D. W is chosen
E. Z is chosen
Ans A
When V is there, X included, which contradicts T's condtn, so it must be excluded

5). "One-sixth of my life", said my boss, "I spent as a child, next one-twelfth as an old boy, one-seventh & 5 more years in politics & socialization. This brought me upto when Jimmy born. Jimmy was elected for the governer four years ago, when he was half my present age." How old is my boss?
ANS.: 84 yrs.
Let my boss's age be 'x'
1/6x + 1/12x + 1/7x + 5 + 1/2x + 4 = x
solve it

6)My watch is 2 minutes per hour slow and my husband watch is 1 minute per hour fast. We went together to a marriage but late. We had a difference of 1 hour. Find the number of hours elapsed from the time we set the 2 clocks correctly till now.
There r two mthds for it . 1 is by solving a series in arithmetic series, since time is constraint 2mthd is better
My watch is 2 min slow, it loses 2 min in 1 hr, My husband's watch gains 1 min in 1 hr. Together in 1 hr ( 2+1 = 3)
3 min in 1 hr
60 min(1 hr) ??
60 *1 / 3 =20 hours
20 hrs elapsed from the time we set the 2 clocks correctly till now

7)There is a robery and four persons are suspected out of them one is actual thief, these are the sentences said by each one of them.
A says D had done.
B says A had done.
C says I have not done.
D says A lied when he said that I am thief.
Out of these, only one man is true remaining are false. Marks : 3.
Ans: C is theif, D is true.
If D speaks truth, A is false ie) D is innocent.
B is false ie) A is innocent
C is false ie) C done it
D is true ie) stmt implies D is innocent

8)A and B are tossing the coin for a bet of 1$ , A won 3$. Later both A and B each won three games. So how many games did they play altogether.
A won 3 $ means he won 3 games, later each won 3 games ie) A 3 and B 3. Total 3+3+3 = 9

9)Sree went to a shop, where each candy costs 4 cents, 2 biscuits cost 1cent and 4 chocolate drops cost 1cent. How can she buy 20 items for 20 cents?
C+b+cb = 20 (number of)
4c+0.5b+0.25cb = 20 ( cents)
now trail and error 4 candies, 8 biscuits, 8 chocolate drops

10 a) 3125, 256, 27, _ , 1
b) 3,10, 7, 8,_, 12, 9 , 16
a) 5^5 + 4^4 + 3^3 + 2^2 +1^1
ans 4

English Section was tough man, its not as easy as every others said, u need to be really good, avg student can hardly cross the cut-off.
Comprehension was 1 full page don't attempt to read, do others and return to it, read Q and search for answers, time is constraint.
Be good at general grammar like diff b/w lying on bed and lying eggs. U can make mistakes.

This is useful only for those who r hav just entered 4th year and wrote exam.
I hav paper pres, mini proj summer jobs etc. imagine he dint even asked for my resumee
My % was pretty low 67.8%. first he posed me Q on my percentage why it was so low (in +2 I got 95 ) I answered but not that convincing,
He said if u deliver just 68 for 100, then when I give u atask how can u succeed, I said I give 110% of my effort so I achieve atleast 99% results ( he was impressed)
Hobbies I said traveling he asked me to talk for 1 min abt Aruku, hillstation. I managed (this is a must Q JAM get ready for this)

coming to puzzles 1) matchsticks that 4 equilateral triangles, ans is pyramid 4 right angle triangles gav a spring with a ring in it, I know it would come out cant do it in that moment try it it will come out.
I am frm mechanical why did I choose it? Not that convincing
And some more
Do u hav any questions?
This is my time, I referred to NDTV interview of Mr.Narayanamurty
What do u mean by scalability?
He explained for 10 min,
a nice gentleman, he was cool and made me feel the same
when I came out I am sure I will get thru
so Frnds hav a question ready for u ,grab the opportunity, let him knw u r interested. It is a MUST.
So thanks frnds, hope above information is useful for u, 10 days preparation is enough.
Do well and get thru, next year by this time I will be there in infosys, waiting for u all.
1 thing all cant clear in first attempt, don't get demoralized, u hav something better stored in for u . this is my sec test, first I attempted Satyam I couldn't clear interview,now I had infosys in hand. Also those who got selected help others to get.

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