A vertical rod PQ of length L is fixed at its top end P and has a flange fixed to the bottom end Q. A weight W is dropped vertically from a height h(< L) on to the flange. The axial stress in the rod can be reduced by-A-increasing the length of the rodB-decreasing the length of the rodC-decreasing the area of cross section of the rodD-increasing the modulus of elasticity of the material-A-increasing the length of the rod

Question

A vertical rod PQ of length L is fixed at its top end P and has a flange fixed to the bottom end Q. A weight W is dropped vertically from a height h(&lt; L) on to the flange. The axial stress in the rod can be reduced by-A-increasing the length of the rodB-decreasing the length of the rodC-decreasing the area of cross section of the rodD-increasing the modulus of elasticity of the material-A-increasing the length of the rod

APTITUDE CRACK · Accepted Answer

The correct option is  A increasing the length of the rod Stress is propotional to strain and (strain=PL/AE) thus reduction in length will decrease strain which will reduce stress.

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Q1: A vertical rod PQ of length L is fixed at its top end P and has a flange fixed to the bottom end Q. A weight W is dropped vertically from a height h(< L) on to the flange. The axial stress in the rod can be reduced by

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Q1: A vertical rod PQ of length L is fixed at its top end P and has a flange fixed to the bottom end Q. A weight W is dropped vertically from a height h(< L) on to the flange. The axial stress in the rod can be reduced by

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