NEET UG PHYSICS MCQ: MECHANICAL PROPERTIES OF SOLIDS

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Application +4 | -1

A steel rail of length 5 m and area of cross-section

40\mathrm{ }c{m^3}

is prevented from expanding along its length while the temperature rises by

{10^0}C

. If coefficient of linear expansion and Young’s modulus of steel are

1.2\mathrm{ } \times \,\,{10^{ - 5}}{K^{ - 1}}

and

2\mathrm{ } \times \mathrm{ }{10^{11}}N{m^{ - 2}}

respectively, the force developed in the rail is approximately :

View answer and explanation

Correct option: B

1\mathrm{ } \times \mathrm{ }{10^5}N

Option B (

1\mathrm{ } \times \mathrm{ }{10^5}N

) is correct because the force developed is related to Young's modulus, area, coefficient of linear expansion, and temperature change.

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