Article Detail Which is smallest planet ? Answer: Mercury Similar Questions : 1. Which is longest river in world ? Answer: Nile, Africa 2. Which Indian state is having longest coastline ? Answer: Gujrat 3. Which is the largest Mosque in India ? Answer: Jama Masjid (Delhi) 4. Which is largest Delta of India ? Answer: Sundarban (W. Bengal) 5. Which is the largest desert in India ? Answer: Thar (Rajasthan) 6. Which is the Densest populated State of India ? Answer: West Bengal 7. Which is Largest library in the world ? Answer: United State Library of Congress, Washington D.C. Read more from - Longest and Largest