The correct option is A 2×10−5∘C−1
We know,
Final volume V=V0(1+γΔT)
where γ is coefficient of volumetric expansion
ΔVV0=γΔT
% Change in volume ΔVV0×100=γΔT×100
⇒0.24=γ×40×100
∴γ=6×10−5∘C−1
Also,we know,
α=γ3
where α is coefficient of linear expansion
∴α=6×10−5∘C−13
=2×10−5∘C−1