Article Detail Which is smallest planet ? Answer: Mercury Similar Questions : 1. Which is the deepest lake of the world ? Answer: Lake Baikal 2. Which is longest river in world ? Answer: Nile, Africa 3. Which is the longest road in India ? Answer: Grand Trunk Road (2500 Km) 4. Which is the largest Mosque in World ? Answer: Masjid al Haram (Saudi Arabia) 5. Which is the Densest populated State of India ? Answer: West Bengal 6. What is the name of tallest Animal ? Answer: Giraffe 7. Which is the highest Plateau ? Answer: Pamir, Tibet Read more from - Longest and Largest