Statement-I is incorrect because one of the standard sizes of the National Flag of India is actually 630 mm × 420 mm instead of 600 mm × 400 mm, aligning with the specifications set by the Bureau of Indian Standards. Statement-II, however, is correct as the ratio of the length to the height (width) of the flag is indeed prescribed as 3:2, which is a fundamental design principle for the flag's dimensions as per the Flag Code of India, 2002. This distinction is significant in understanding the proper adherence to national symbols and their specifications, a topic relevant in governance and cultural representation discussed in UPSC Prelims syllabus.