Article Detail Which is smallest planet ? Answer: Mercury Similar Questions : 1. Which is the largest Mosque in India ? Answer: Jama Masjid (Delhi) 2. Which is the largest Zoo in India ? Answer: Zoological Gardens, Alipur, Kolkata 3. Which is Highest Battle field ? Answer: Siachin Glacier. Mastguru team Salutes to Indian soldiers. 4. Which is smallest planet ? Answer: Mercury 5. Which Indian state is having longest coastline ? Answer: Gujrat 6. Which is the largest Mosque in World ? Answer: Masjid al Haram (Saudi Arabia) 7. Which is Longest road tunnel in the World ? Answer: Lærdal Tunnel (Norway - 24.51 kilometre) Read more from - Longest and Largest