Identify the material having low coefficient of volume expansion

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Question

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RRB ALP Fitter 23 Jan 2019 Official Paper (Shift 3)

Answer 1

Explanation:

Coefficient of volume expansion:

It is the measure of the fractional change of size per unit change in the temperature with the surrounding pressure being constant.
It affects the volume of the particular body.
This coefficient is most applicable to fluids.
It generally depends on the temperature as the coefficient increases with the subsequent increase in temperature.
For a small temperature change, ∆T, the fractional change in volume, ∆V/V, is directly proportional to ∆T.
- ∆V/V = αv ∆T, where αv is the coefficient of volume expansion.