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8. mechanical properties of solids — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics8. mechanical properties of solids1 Mark
MCQ
When a load $W$ is hung from a wire of length $2\ L$ , it just breaks. Now this wire is completely melted and a new wire of length $L$ is formed. If the load $W$ is hung from this new wire
  • A
    It will definitely break
  • ✓
    It will definitely not break
  • C
    cannot be predicted
  • D
    None of these
✓

Answer

Correct option: B.
It will definitely not break
b
If length halved, area is doubled

$\Rightarrow$ Breaking stress $=\frac{\mathrm{W}}{\mathrm{A}}=\frac{\mathrm{W}^{\prime}}{2 \mathrm{A}}$

to break new wire load $W^{\prime}=2 W$

on applying $W,$ new wire will not break.

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