A cylindrical boiler shell has an internal diameter of 2000 mm and a plate thickness of 15 mm. It is subjected to an internal pressure of 4 MPa. If the joint efficiency is 90%, what is the maximum allowable longitudinal stress in the shell?

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?