Q. Which among the following would be the longest day in Australia?
Answer: December 22
Notes: The longest day in Australia occurs on December 22, which is the summer solstice in the Southern Hemisphere. On this day, Australia experiences the most daylight hours, with regions like Darwin having up to 13.5 hours of sunlight. In contrast, June 21 is the winter solstice, resulting in the shortest day. September 22 and March 23 are equinoxes, where day and night are approximately equal in length.