In concrete mix design of M40 grade concrete, assuming the standard deviation value of characteristic strength of concrete as in IS 456 : 2000, the target mean strength of concrete mix (in N/mm2 units) is expected to be:

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?