Physics-Young's Modulus
NEET Physics Young's Modulus MCQ Question
Type: MCQ-fact-Hard-Class 11
What is the minimum area of cross-section required for a steel rope to safely lift a load of 10 tonnes, given the yield strength of mild steel is 300 × 10^6 N/m²?
A
3 × 10^-4 m²
B
0 × 10^-4 m²
C
5.0 × 10^-4 m²
D
0 × 10^-4 m²
Correct Answer
Option A
Detailed Explanation
The minimum area of cross-section is calculated using the formula A ≥ W/σ_y. For a load of 10 tonnes (10,000 kg) and yield strength of mild steel, the area comes out to be 3.3 × 10^-4 m².
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