Question

If the coefficient of cubical expansion of a meterial is 'x' times of the coefficient of surfacial expansion , then value of 'x' is

• A. $\frac{1}{2}$
• B. 1.5
• C. 2
• D. 4

Answer 1

Answer: (B)

1.5

Let the coefficient of cubical expansion and surfacial expansion are denoted by $\gamma$ and $\sigma$ respectively.
The relation is given by -
$\frac{\gamma }{3}=\frac{\sigma }{2}$
$⟹$ $\gamma =1.5\sigma$
Thus we get $x=1.5$