World Polio Day is observed annually on October 24th. This day is dedicated to raising awareness about the importance of polio vaccination and efforts to eradicate polio worldwide. It is an opportunity to celebrate the progress made in the fight against polio and to renew commitments to end this crippling disease.

The NDA is located at Khadakwasla near Pune in the state of Maharashtra, India. It is the premier institution for training officers for the Indian Armed Forces. Dehradun, on the other hand, is home to the Indian Military Academy (IMA), which trains officers for the Indian Army.

Chhatrapati Shivaji Terminus (formerly known as Victoria Terminus) in Mumbai, India, was designed by the British architect Frederick William Stevens. The station, a UNESCO World Heritage Site, is a historic railway station and a remarkable example of Victorian Gothic architecture in India. It was completed in 1888 and has since been an iconic landmark in Mumbai.

The green color in the Indian National Flag signifies faith, fertility, and valor. It is associated with the greenery of the land, the prosperity of the nation, and the faith and valor of its people. The white stripe next to the green one represents truth and peace, while the saffron color at the top symbolizes courage and sacrifice. 

1. Four rivers (Rupangarh, Mentha, Khari, Khandela) fall into Sambhar Lake. Salt is produced on a large scale from this lake.

2. Sambhar Lake: This is a salt water lake located near Jaipur city in Rajasthan state of India. This lake is situated at an altitude of 1,200 feet above sea level.

The Danish East India Company was formed in the year 1616. The company played a role in trade and colonial activities in Asia, including India, during the 17th and 18th centuries. It established trading posts and forts in various parts of India, particularly in Tranquebar (now Tharangambadi) on the southeastern coast.

Raja Ram Mohan Roy is known as the father of Indian Nationalism, the Father of Indian Renaissance and the Prophet of Indian Nationalism. He started the Brahmo Samaj in 1828. He also started Atmiya Sabha by attracting young men from Calcutta and carried on struggle against the religious and social evils.