Consider the statements A and B and identify the correct answer given below.
A) If the volume of a body remains unchanged, when subjected to tensile strain, the value of Poisson's ratio is 1/2 

B) Phosphor bronze has low Young's modulus and high rigidity modulus

• Since the volume changes by zero or stays constant, the Poissons ratio, which we know to be 0.5, indicates that the proposition is true. 
• The alloy phosphor bronze has a low stiffness modulus and a high Youngs modulus.

Hence the correct answer is A is correct and B is wrong .