Exterro Interview Question

1.Implement stack using queue and queue ising stack 2.what is normalization and why they are? 3.why import in java? 4.what is the use of collections in java? 5.program to find two largest numbers in an array without sorting..in a single scan 5.program to separate 0's and 1's in an array ina single scan. 6.cube puzzle:4 inch cube painted on all the 6 sides..if cut into equal 1 inch cubes..how many total cubes? How many 1 sided,two sided ,3 sided and no sided painted cube. 7.tell me about yourself 8.why exterro and how long will you b wid exterro?