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NEET UG PHYSICS MCQ: MECHANICAL PROPERTIES OF SOLIDS

1 Easy

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Understanding +4 | -1

Assertion(A): If length of a wire is halved, its Young's modulus of elasticity will become two times.

Reason(R): The ratio of longitudinal stress and longitudinal strain is called Young's modulus of elasticity.

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Correct option: D

If Assertion is false but Reason is true.

Option D (If Assertion is false but Reason is true) is correct because Young's modulus is a material property and does not depend on the length of the wire.

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A 20 kg load is suspended by a wire of area of cross section is

1\,m{m^2}

. The stress produced in

N/{m^2}

\left[ {g = 10\,m{s^{ - 2}}\,} \right]\,

In magnitude hydraulic stress is equal to: A wire extends by

\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\,\,m

long rod of radius

1\,\,cm

which is fixed from one end is given a twist of

0.8

radians. The shear strain developed will be The relationship between Young’s modulus

Y

\mathrm{K}

and modulus of rigidity

\eta