1. Solve a puzzle.

You can add but can not delete.

8_8_8_8_8_8_8_8_=1000

Ans:

we know 2^10 = 1024.

8*8*8*8^ (1/3) = 1024.

8+8+8*8^0 = 24.

So,

8*8*8*8^(1/3)-8-8-8*8^0 = 1000.

2. Write a c program to store pure water into a tank .water source is not fully pure.

You can use only one water purifier but it can purify 90%of input water.

Ans:

water store (water src)

{

container l1,l2;

while(src)

{

l1=src;

empty(src);

l2=purifier(l1);

empty(l1);

if(l2 is 99% pure)

return l2;

else

{

src=l2;

empty(l2);

}

}

}

3. Belady's Anomalies in Operating systems page fault concept.

4. Java - Polymorphism.

5. Sql - Normalization, Joins.