INFOSYS PLACEMENT PAPERS ----- Placement Paper 5



INFOSYS PLACEMENT PAPERS ----- Placement Paper 5..

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INFOSYS QUESTIONS

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Section A

1) A man collects cigarette stubs and makes one full
cigarette with every 8 stubs.
If he gets 64 stubs how many full cigarettes can he
smoke.

2) A soldier looses his way in a thick jungle. At random he
walks from his camp but mathematically in an interesting
fashion. First he walks one mile East then half mile to
North. Then 1/4 mile to West, then 1/8 mile to South and so
on making a loop.
Finally how far he is from his camp and in which direction.

3) How can 1000000000 be written as a product of two
factors neither of them containing zeros

4) Conversation between two mathematcians:
First : I have three childern. The product of their ages is
36.
If you sum their ages, it is exactly same as my
neighbour's door number on my left.
The second mathematician verfies the door number and says
that it is not sufficient.
Then the first says " Ok one more clue is that my youngest
is really the youngest". Immmediately the second
mathematician answers .
Can you answer the question asked by the first
mathematician?
What are the childeren ages?

5) Light glows for every 13 seconds . How many times did it
glow between 1:57:58 and 3:20:47 am.

6) 500 men are arranged in an array of 10 rows and 50
columns according to their heights.
Tallest among each row of all are asked to fall out.
And the shortest among them is A.
Similarly after resuming that to their original
podsitions that the shortest among each column are asked to
fall out.
And the tallest among them is B .
Now who is taller among A and B ?

7) A person with some money spends1/3 for cloths, 1/5 of
the remaining for food and 1/4 of the remaining for travel.
He is left with Rs 100/- .
How much did he have with him in the begining ?

8) There are six boxes containing 5 , 7 , 14 , 16 , 18 ,
29 balls of either red or blue in colour. Some boxes
contain only red balls and others contain only blue.
One sales man sold one box out of them and then he
says
" I have the same number of red balls left out as that
of blue ".
Which box is the one he solds out ?
9) A chain is broken into three pieces of equal lenths
containing 3 links each.
It is taken to a backsmith to join into a single
continuous one .
How many links are to to be opened to make it ?

10) Grass in lawn grows equally thick and in a uniform
rate.
It takes 24 days for 70 cows and 60 days for 30 cows
to eat the whole of the grass.
How many cows are needed to eat the grass in 96
days.?

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Answers Section A

Q-1
Ans: 8+1=9

Q-2
Ans: Distance travelled in north and south directions
1/2 - 1/8 + 1/32 - 1/128 + 1/512 - and so on
= 1/2/((1-(-1/4))
Similarly in east and west directions
1- 1/4 + 1/16 - 1/64 + 1/256 - and so on
= 1/(( 1- ( - 1/4))
Add both the answers

Q-3
Ans: 2 power 9 x 5 power 9

Q-4
Ans 1,6 and 6

Q-5
Ans : 383 + 1 = 384

Q-6
Ans A

Q-7
Ans: Rs 250/-

Q-8
Ans: Total no of balls = 89 and (89-29 /2) = 60/2 = 30
and also 14 + 16 = 5 + 7 + 18 = 30

Q-9
Ans : 2.

Q-10
Ans : 20
g - grass at the beginning
r - rate at which grass grows, per day
y - rate at which one cow eats grass, per day
n - no of cows to eat the grass in 96 days
g + 24*r = 70 * 24 * y
g + 60*r = 30 * 60 * y
g + 96*r = n * 96 * y
Solving, n = 20.
Section B

1. Replace each letter by a digit.
Each letter must be represented by the same digit and
no beginning letter of a word can be 0.

O N E
O N E
O N E
O N E
-------
T E N

2. 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?

3. Sometime after 10:00 PM a murder took place.
A witness claimed that the clock must have stopped at
the time of the shooting.
It was later found that the postion of both the hands
were the same but their positions had interchanged.
Tell the time of the shooting (both actual and claimed).

4. Next number in the series is
1 , 2 , 4 , 13 , 31 , 112 , ?

5. Shahrukh speaks truth only in the morning and lies in
the afternoon, whereas Salman speaks truth only in the
afternoon. A says that B is Shahrukh. Is it morning or
afternoon and who is A - Shahrukh or Salman.

6. Two trains starting at same time, one from Bangalore to
Mysore and other in opposite direction arrive at their
destination 1 hr and 4 hours respectively after passing
each other. How nuch faster is one train from other?

7. There are 6 volumes of books on a rack kept in order (
ie vol.1, vol. 2 and so on ).
Give the position after the following changes were
noticed.
All books have been changed
Vol.5 was directly to the right of Vol.2
Vol.4 has Vol.6 to its left and both weren't at Vol.3's
place
Vol.1 has Vol.3 on right and Vol.5 on left
An even numbered volume is at Vol.5's place
Find the order in which the books are kept now.
8. I bought a car with a peculiar 5 digit numbered licence
plate which on reversing could still be read.
On reversing value is increased by 78633.Whats the
original number if all digits were different?

9. The shape in the sketch below is that of a square
attached to half of a similar square.Divide it into four
equal pieces

10. Supposing a clock takes 7 seconds to strike 7. How
mlong will it take to strike 10?

Section B Answers

Q-1
Ans: 0 =1, N = 8 ,E = 2, T = 7

Q-2
Ans: 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.

Q-3
Ans: Time of shooting = 11:54 PM
Claimed Time = 10:59 PM

Q-4
Ans: 224.
No number has digits more than 4. All of them are
1 , 2, 4, 8 , 16 , 32 , 64 converted to numbers in base 5

Q-5
Ans: Afternoon ; A is Salman.

Q-6
Ans: Twice

Q-7
Ans: 2 , 5 , 1 , 3 , 6 , 4

Q-8
Ans: Only 0 1 6 8 and 9 can be readupside down.So on
rearranging these digits we get the answer as 10968

Q-9
Ans: Hint : the figure can be divided into 12 equal
triangles

Q-10
Ans: 10 1/2 seconds.


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