Visvesvaraya Technological University (VTU) 2007 B.E Computer Science infosys - Question Paper

1.There is a escalator and two persons move down it.A takes 50 steps and B takes 75 steps while the escalator is moving down. provided that the time taken by A to take one step is equal to time taken by B to take three steps. obtain the no. of steps in the escalator while it is staionary.

If A takes one step in 1 second, then B takes three steps in 1 second. If A takes t1 seconds to take 50 steps, then B takes 150 steps in t1 seconds.For B, to take 150 steps he requires t1 seconds,
then to take 75 steps he requires t1/2 seconds.
So now, s1=50, t1 = t1 & s2=75, t2=t1/2

Ans= (s1*t2 ~ s2*t1) / (t1 ~ t2) which provide 100.
so 100 steps is the ans

2. If 5/2 artists make 5/2 paintings using 5/2 canvases in 5/2 days then how many artists r needed to make 25 paintings using 25 canvases in 25 days?

3. If the digits of my current age are reversed then i get the age of my son.If one year ago my age was twice as that of my son.Find my current age.
Ans. father-73, son-37

4. There are 6561 balls out of them one is heavy.Find the min. no. of times the balls have to be weighed for finding out the haevy ball.
Ans. 8

5. If i walk with 30 miles/hr i reach one hour before and if i walk with 20 miles/hr i reach one hour late.Find the distance ranging from two points and the exact time of reaching destination is 11 am then obtain the speed with which it walks.
Ans. 120miles and 24 miles/hr

6. There r 4 face cards (J,Q,K,A) all of various types(diamond,club,spade,heart) and a few conditions r provided.find the order of cards
Ans. king -> jack -> queen -> ace heart diamond spade club

7. If A,B,C,D,E r five members of a family.4 of them provide actual statements :
1. E is my mother in legal regulations
2. C is my son in law's brother
3. B is my father's brother
4. A is my brother's spouse

Who made the stmt. and what r the realtions among them
Ans. E

|
AB–C
|
D
denotes husband-wife – denotes brothers


8. The product of five various temperatures is 12.If all of then r integers then obtain all the temperatures
Ans. -2,-1,1,2,3


9.There r nine cities numbered one to 9.From how many cities the flight can begin so as to reach the city eight either directly or indirectly such the path formed is divisible
by 3.
e.g. 1368-Flights goes through 1-3-6-8.

10. If i do this puzzle i obtain it to be hard than the last puzzle that i did before that after that…………..very complex stmt. Is that puzzle difficult, easy, can't say or depends on the no. of puzzles

11. change every letter by a digit. every letter must be represented by the identical 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
———
Ans: 0 =1, N = eight ,E = 2, T = 7.

Earning:   Approval pending.