Solution: (a)
National Highway 1 or NH 1 is a National Highway in Northern India that links the national capital New Delhi to the town of Attari in Punjab near the India–Pakistan border. This was a part of Grand Trunk Road of Sher Shah Suri that ran from Lahore to Bengal, built on earlier roads that existed from time immemorial.

Solution: (a)
The North–South Corridor comprises NH 1A (Srinagar–Jalandhar), NH 1 (Jalandhar – Delhi), NH 2 (Delhi–Agra), NH 3 (Agra–Gwalior), NH 75 (Gwalior– Jhansi), NH 26 (Jhansi–Lakhnadon), NH 7 (Lakhnadon–Nagpur-Hyderabad-Bangalore-MaduraiKanyakumari), NH 47 (Salem–Coimbatore–Kochi).

Solution: (a)
The busiest rail section in respect to goods transportation is Delhi-Kolkata section.

Solution: (d)
India has a long coastline, spanning 7516.6 kilometers, forming one of the biggest peninsulas in the world. It is serviced by 13 major ports (12 government and 1 corporate) and 187 notified minor and intermediate ports. The latest addition to major ports is Port Blair on June 2010, the 13th port in the country.
The largest natural port in India is Mumbai port Trust.
The thirteen seaports include Kochi port in Kerala, Kamarajar port (formally Ennore port) in Tamil Nadu, Port blair port in Andaman and Nicobar Islands, Kolkata port in West Bengal, Kandla port in Gujarat, Mangalore port in Karnataka, Marmagoa port in Goa, Mumbai Port in Maharashtra, Jawaharlal Nehru Port in Maharashtra, Paradip port in Odisha, Tuticorin port in Tamil Nadu, Vishakhapatnam port in Andhra Pradesh, and Chennai port in Tamil Nadu.

Solution: (c)
Mumbai is the headquarters of two railway zones: Western and Central Zones. The Western Railway is one of the 17 zones of Indian Railways, and is among the busiest railway networks in India. The central zone covers a large part of the state of Maharashtra and parts of North-Eastern Karnataka and Southern Madhya Pradesh.