GENERAL KNOWLEDGE

Detailed explanation-1: -There is a general understanding among the countries of the world to select the standard meridian in multiples of 7°30’ of longitude. That is why 82°30’ E has been selected as the ‘standard meridian’ of India.

Detailed explanation-2: -When we compare the two lists to see what they have in common, we get the answer to “What are the common multiples of 7 and 30?” 210, 420, 630, 840, etc. Since 210 is the first number they have in common, 210 is the least common multiple of 7 and 30.

Detailed explanation-3: -Standard Meridian is a longitude that determines a standard time for the whole country. The standard meridian of India is 82°30’E. A standard meridian was adopted among many meridians for the country to bring about uniformity in time across the country. There are different time zones in India.

Detailed explanation-4: -Answer: From Gujarat to Arunachal Pradesh there is a time lag of two hours. Hence, time along the Standard Meridian of India (82° 30’ E) passing through Mirzapur (in Uttar Pradesh) is taken as the standard time for the whole country.