The government agency responsible for laying down and maintaining roads in India.

Which are the chief means of transportation in India? Discuss the factors affecting their development.

Give a detailed account of the development of railways in India and highlight their importance.

Describe the role of roads in the economic development of India.

Explain the importance and characteristics of different modes of transportation in India . 

State the different gauges of Indian railway.

Mention two national waterways.

Describe Golden Quadrangle.

Mention any three national highways along with their terminals in India.

Which remote sensing agency is located at Hyderabad and what is its role?

Name the air service which is widely used in hilly areas of North-Eastern states of India.