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NEET UG PHYSICS MCQ: MECHANICAL PROPERTIES OF SOLIDS

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What is the Young's modulus of elasticity for a perfectly rigid body?
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Correct option: A
Infinity
Option A is correct because a perfectly rigid body does not deform under any stress, thus its Young's modulus is infinite.

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A 20 kg load is suspended by a wire of area of cross section is 1 mm21\,m{m^2}. The stress produced in N/m2N/{m^2} is [g=10 ms−2 ] \left[ {g = 10\,m{s^{ - 2}}\,} \right]\, In magnitude hydraulic stress is equal to: A wire extends by 1mm\mathrm{1 mm} when a force is applied. Double the force is applied to another wire of same material and length but half the radius of cross-section. The elongation of the wire in mm will be Stress to strain ratio is equivalent to A 2  m2\,\,m long rod of radius 1  cm1\,\,cm which is fixed from one end is given a twist of 0.80.8 radians. The shear strain developed will be The relationship between Young’s modulus YY, Bulk modulus K\mathrm{K} and modulus of rigidity η\eta is
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