Article Detail Which is the longest day in the year ? Answer: June 21 Similar Questions : 1. Which is the longest Platform ? Answer: Gorakhpur railway station, Uttar Pradesh, India (1355.40 meters) 2. Which is Largest library in the world ? Answer: United State Library of Congress, Washington D.C. 3. Which is smallest and largest bird ? Answer: Smallest Bird is Humming Bird and Largest bird is Ostrich 4. Which is Highest Gallantry Award in India ? Answer: Paramveer Chakra 5. Which is biggest planet ? Answer: Jupiter 6. Which is longest tributary river of India ? Answer: Yamuna 7. Which is the biggest museum in the world ? Answer: British Museum, London Read more from - Longest and Largest