A simple pendulum with a string length of 30 cm performs 20 oscillations in 10 s. The length of the string required for the same pendulum to perform 40 oscillations in the same time duration (10 s) is:

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?