Article Detail Which is the longest day in the year ? Answer: June 21 Similar Questions : 1. Which is the largest desert in India ? Answer: Thar (Rajasthan) 2. Which is the largest Mosque in World ? Answer: Masjid al Haram (Saudi Arabia) 3. Which state is largest by Population ? Answer: Uttar Pradesh 4. Which is the lightest metal ? Answer: Lithium 5. Which is the biggest country in Area ? Answer: Russia 6. Which is the highest Plateau ? Answer: Pamir, Tibet 7. Which is longest railway station ? Answer: Grand Central Terminal, Chicago(USA). Read more from - Longest and Largest