NEET UG PHYSICS MCQ: MECHANICAL PROPERTIES OF SOLIDS

1 Medium

1 of 1

Application +4 | -1

A force of 200 N is applied at one end of a wire of length

2m

and having area of cross-section

{10^{ - 2}}c{m^2}

. The other end of the wire is rigidly fixed. If coefficient of linear expansion of the wire

\alpha = 8 \times {10^{ - 6}}/{\,^0}C

and Young’s modulus

Y = 2.2 \times {10^{11}}\;N/{m^2}

and its temperature is increased by

{5^0}C

, then the increase in the tension of the wire will be

View answer and explanation

Correct option: D

8.8 N

Option D (8.8 N) is correct because the increase in tension is calculated considering both the applied force and the thermal stress due to temperature change.

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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