भारत का सबसे पुराना पर्वतीय रेलवे कौन सा है जिसे यूनेस्को (UNESCO) विश्व धरोहर स्थल घोषित किया गया है?

Which mode of transport is most suitable for carrying bulky and heavy goods over very long distances, particularly in international trade, at the lowest cost?

National Waterway-1 of India covers which of the following stretches?

The North–South corridor, which is a part of the National Highway network, links which two locations in India?