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NEET UG PHYSICS MCQ: MECHANICAL PROPERTIES OF SOLIDS

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Understanding +4 | -1
Assertion: From the relation Y=FlAΞ”l,Y=\frac{F l}{A \Delta l}, we can say that, if length of a wire is doubled, its Young's modulus of elasticity will also becomes two times.

Reason: Modulus of elasticity is a material property.
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Correct option: D
If Assertion is false but the Reason is true
Option D (If Assertion is false but the Reason is true) is correct because Young's modulus is a material property and does not change with length.

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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 msβˆ’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 Ξ·\eta is
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