IBM Placement Paper 20

1.7^253. last digit?
ans. 7

2.10^10^10 how much time will it take to write thsi number,if it takes 1 sec to write 1 digit.
-1000 secs.
-10 year.
-more than 1 million years.
-a few days.
ans. more than 1 million years.

3. starting from 2 upto how many numbers we need to check whether 907 is prime or not?

4. a persons age is similar to the year he was born(last two digits is counted as age).ans. 80.

5. what is YACC? ans. yet another compiler compiler.

6. flop is a unit of ? ans. processing speed.

7.#define hello(x,y) printf(#expr"%d",expr);
main(){
float x=1,y=2;
expr=x/y;
hello(expr);
}
ans. x/y=1;

8.time and work and days.(easy questions).

9.A&B fill 3 litres and 5 litres of oil in the car. C pays Rs. 8/- to A7B. How much will A get?

10. a question on "set" theory.it was given that less than 30 persons in class.(Ans . cannot be determined.).

11. 4 cows are there at the four corners of a square. if the radius of the rope is 1 and lenth of one side of the square is 14, find the area along the square which the cow cannot gaze.
ans. 14*14-pi*r*r;

12. two glasses were filled with 1/3 and 1/4 milk. they were filled with water &then mixed in tumbler. what is the percentage of milk in the resultant.

13 average speed 2xy/x+y.

14. A belongs to the truther tribe " who says yes". B belongs to the liers tribe " who says no always".when A&B were asked to which group do they belonged to both of them replied "yes".when a third person C was asked whether A&B belong to same group,he notified groups he answered "No".to which group do A,B and C belong? ans.LLL or LTT.

15.There were three clocks they gave alarm after 24secs, 12secs and 36 secs.if they rang simulatneously at 8:20, then at what time they again rang simultaneously?(something like this but numbers may differ). ans. 8:27:12

16.a plane starts from a place A , it goes 1000 kms south then 1000km east then 1000 km north and 1000km west, what is it distance from the starting place? ans.same starting place.

17.question on Bipartite graph(definition).

18.heap-sorting algorithm time complexity.(ans nlogn)

19.white-box testing.

20.postfix evaluation of: (A+B)*C(Ans: AB+C*)

21.question on catch-throw? c++

22.parity bit?(Ans: as error detection).

23.main(){
main();
}
ans.stack overflow.

24.main()
{ char a,b;
printf("%d%d%d%d",sizeof('a');
sizeof(NULL),sizeof(b),sizeof(main));

} Ans(1,1,1,2)

25.five file sizes given . what should be the order of their access so that least time is taken.
ans.least size first.

26. SQL query does what?

27. 5 questions on reasoning.