For which material poisson's ratio is greater than 1.
A. Steel
B. Copper.
C. Aluminum.
D. None of the Above.

Hint: The Poisson’s ratio is the ratio of the lateral strain to the linear or longitudinal strain. It is used to find the expansion rate of the material. The strain is defined as the ratio of the change of length to the actual length. The expansion in the material results when any force is applied.


Complete step by step answer
The Poisson’s ratio is always used to find the expansion rate when a force is applied on a material. The lateral strain is the ratio of the change of diameter to the actual diameter of the material and the linear strain is the ratio of the change in the length to the actual length.
The Poisson’s ratio is a fixed term, it means the Poisson’s ratio for any material lies between 0 to 1. There is no material that has more than 1 and less than 0. If the Poisson’s ratio is not between 0 to 1 then the values assumed or solved are wrong.
Therefore, the correct answer is none of the given options. It means option (d) is correct.


Note: Be sure about the differences of lateral strain and the linear strain, when there is change in the diameter of a material then it is called as lateral strain, if the change is in linear or in length of the material then it is called as the linear strain. So the ratio of both strains (lateral and linear) is called the Poisson’s ratio.