The rate at which solar energy is received by the Earth's surface perpendicular to the rays at the outer edge of the atmosphere, equal to approximately 1.94 calories per sq. cm. per minute, is known as the:

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?