Article Detail Which is the lightest metal ? Answer: Lithium Similar Questions : 1. Which is smallest planet ? Answer: Mercury 2. Which is the Densest populated State of India ? Answer: West Bengal 3. What is the name of tallest Animal ? Answer: Giraffe 4. Which is the longest Platform ? Answer: Gorakhpur railway station, Uttar Pradesh, India (1355.40 meters) 5. Which is the longest rail tunnel in India ? Answer: Pir Panjal (J&k, 11215 metre) 6. Which is the shortest day in the year ? Answer: December 22 7. Which is Highest Battle field ? Answer: Siachin Glacier. Mastguru team Salutes to Indian soldiers. Read more from - Longest and Largest