AIIMS 2019 Physics Coefficient of Expansion MCQ Question

Option A is correct because it represents the calculated coefficient of cubical expansion (Y) for the material, derived from the linear expansion coefficient (α) using the relationship Y = 3α. The calculation shows that α = 1.9 × 10⁻⁵ / °C, leading to Y = 5.7 × 10⁻⁵ / °C, which is consistent with the principles of thermal expansion where solids expand in three dimensions. Other options are not applicable as they do not provide relevant values or calculations related to the problem presented. Understanding these coefficients is crucial in materials science, particularly in applications involving temperature changes in solids, liquids (like H₂O), and gases (like CO₂).