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Question

The ratio of hydraulic stress and its associated tetanic tension is called __________.

This question was previously asked in
RPF SI 2018 Question Paper PDF (10-Jan-2019) (Shift 1)
The correct answer is

Volume amplitude modulus

The stem means: the ratio of hydraulic stress to the corresponding hydraulic (volumetric) strain is called ______.

When a body is subjected to uniform pressure from all sides (hydraulic stress), its volume changes. The bulk modulus is defined as \(B = -\dfrac{p}{\Delta V / V}\), where p is the hydraulic stress and \(\Delta V / V\) is the volume strain.

The negative sign shows that volume decreases when pressure increases. Its reciprocal is called compressibility. This 'volume modulus' is what the translated option 'Volume amplitude modulus' refers to.

Hence, the answer is the bulk (volume) modulus, given as 'Volume amplitude modulus'.

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