Longest, Largest, Biggest, Smallest, Tallest and Highest

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Longest river (India) Ganges
Longest river (World) Nile
The longest tributary river of India Yamuna
The longest river of the south Godavari
Highest mountain peak Godwin Austin(k2)
Largest lake (Fresh water) Wular lake (Kashmir)
Highest Dam Tehri Dam on Bhagirathi River
Largest Mosque Jama Masjid, Delhi

Longest Road Grand Trunk Road
State with longest coastline Gujarat
Largest railway route Dibrugarh in Assam to Kannyakumari in Tamil Nadu
Longest tunnel Jawahar tunnel (Jammu & Kashmir)
Longest national highway NH-7 which runs from Varanasi to Kanyakumari
Longest Dam Hirakod Dam (Orissa)
Longest River Bride Mahatma Gandhi Setu, Patna
Longest populated city Mumbai (1.60 crore)
Largest Museum National Museum, Kolkata
Largest Delta Sunderban Delta, W. Bengal
Largest Dome Gol Gumbaz, Bijapur (Karnataka)
Largest Zoo Zoological Gardens, Alipur, Kolkata
Largest man-made Lake Govind Vallabh Pant Sagar (Rihand Dam)
Largest Desert Thar (Rajasthan)
Highest Tower Pitampura Tower, Delhi
Smallest State (Area) Goa
Smallest State (Population) Sikkim
Highest Waterfall Gersoppa waterfall (Karnataka)
Longest Electric railway line From Delhi to Kolkata via Patna
Densest populated State West Bengal
Largest cave temple Kailash temple, Ellora (Maharashtra)
Largest animal Fair Sonepur (Bihar)
Highest Gateway Buland Darwaza, Fatehpur Sikri (Agra)
Biggest Hotel Oberal –Sharaton (Mumbai)
Largest State (Area) Rajasthan
Largest State (Population) Uttar Pradesh
Place of heaviest rainfall Mausinram (Meghalaya)
Largest corridor Rameshwaram temple corridor (Tamil Nadu)
Largest cantilever span bride Howrah Bridge (Kolkata)
Largest forest state M.P.
Highest straight gravity Dam Bhakra Dam
Longest Railway Platform Kharagpur (W. Bengal)
Largest Stadium Salt lake (Yuva Bharti), Kolkata
Largest Port Mumbai
Highest Lake Devatal (Garhwal)
Largest Lake (Saline water) Chika lake,Orissa
Highest Award Bharat Ratna
Highest Gallantry Award Paramveer Chakra
Largest Gurudwara Golden Temple, Amritsar
Deepest river valley Bhagirathi & Alaknanda
State with longest coastline of South India Andhra Pradesh
Longest river which forms estuary Narmada
Largest Church Saint Cathedral (Goa)
Longest Beach Marina Beach, Chennai
Highest Battle field Siachin Glacier
Highest Airport Len (Laddakh)
Largest river island Majuli (Brahmaputra river, Assam)
Largest Planetarium Birla Planetarium