NEET UG PHYSICS MCQ: MECHANICAL PROPERTIES OF SOLIDS

1 Medium

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Analyzing +4 | -1

Statement I: A steel wire of natural length '

\ell

' breaks, when clongated by length '

x

'. If original length is halved and elongated by

x / 2

it breaks.
Statement II: Breaking force is directly proportional to the length of the wire.

View answer and explanation

Correct option: B

Statement I is true and statement II is false

Statement I is true and statement II is false because the breaking stress is a material property and independent of length, while the breaking force depends on the area of cross-section.

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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

, Bulk modulus

\mathrm{K}

and modulus of rigidity

\eta