Article Detail Which is the longest rail tunnel in India ? Answer: Pir Panjal (J&k, 11215 metre) Similar Questions : 1. Which is the Densest populated State of India ? Answer: West Bengal 2. Which is the highest dam in India ? Answer: Tehri Dam on Bhagirathi River in Uttarakhand (Height of 260 metres) 3. Which is the largest Zoo in India ? Answer: Zoological Gardens, Alipur, Kolkata 4. Which is the longest day in the year ? Answer: June 21 5. Which is the Largest lake of the world ? Answer: Caspian Sea (371,000 sq km) 6. Which is the largest epic in world ? Answer: Mahabharat 7. Which is the largest desert in India ? Answer: Thar (Rajasthan) Read more from - Longest and Largest