Updated: Question in GATE 2012 Mechanical Engineering Paper with Solution

A question in GATE 2012 Mechanical Engineering Paper with Solution has been updated:

A thin walled spherical shell is subjected to an internal pressure. If the radius of the shell is increased by 1% and the thickness is reduced by 1%, with the internal pressure remaining the same, the percentage change in the circumferential (hoop) stress is

1. 2.02
2. 1
3. 1.08
4. 0