Question

For a given material, the Young's modulus is $2.4$ times that of the modulus of rigidity. Its Poisson's ratio is

• A. $2.4$
• B. $1.2$
• C. $0.4$
• D. $0.2$

Answer 1

Answer: (D)

$0.2$

As $Y=2\eta (1+\sigma )$
where the symbols have their usual meanings
Given: $Y=2.4\eta$
$\therefore 2.4\eta =2\eta (1+\sigma )$
$1.2=1+\sigma or\sigma 1.2-1=0.2$