Article Detail Which is the longest rail tunnel in India ? Answer: Pir Panjal (J&k, 11215 metre) Similar Questions : 1. Which is smallest planet ? Answer: Mercury 2. Which is the smallest state of India by Population ? Answer: Sikkim 3. Which is Highest Award in India ? Answer: Bharat Ratna 4. Which is the longest day in the year ? Answer: June 21 5. Which is Highest Gallantry Award in India ? Answer: Paramveer Chakra 6. Which is Longest road tunnel in the World ? Answer: Lærdal Tunnel (Norway - 24.51 kilometre) 7. Which is Largest Dome in World ? Answer: St. Peter's Basilica (Rome) Read more from - Longest and Largest