Article Detail Which is Largest library in the world ? Answer: United State Library of Congress, Washington D.C. Similar Questions : 1. Which is Longest Dam in India ? Answer: Hirakod Dam (Orissa) 2. Which is Longest national highway of India ? Answer: NH-7 ( Varanasi to Kanyakumari - 2,369 km) 3. Which is largest Delta of India ? Answer: Sundarban (W. Bengal) 4. Which is the longest rail tunnel in India ? Answer: Pir Panjal (J&k, 11215 metre) 5. Which is the shortest day in the year ? Answer: December 22 6. Which is the highest Plateau ? Answer: Pamir, Tibet 7. Which is longest tributary river of India ? Answer: Yamuna Read more from - Longest and Largest