NEET UG PHYSICS MCQ: MECHANICAL PROPERTIES OF SOLIDS

1 Medium

1 of 1

Application +4 | -1

A rectangular bar

2\,\,cm

in breadth and

1\,\,cm

in depth and

100\,\,cm

in length is supported at its ends and a load of

2

kg is applied at its middle. If Young’s modulus of the material of the bar is

20\,\, \times \,\,{10^{11}}\,\,\mathrm{dyne c}{\mathrm{m}^{ - 2}},

, the depression in the bar is

View answer and explanation

Correct option: C

0.1225{\mkern 1mu} {\mkern 1mu} \,cm

Option C is correct. The depression in the bar is calculated using the formula for the deflection of a rectangular beam supported at its ends with a load at the center.

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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