Q1: A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.

ANS:B - >10

The rate of cooling of a body is typically proportional to the temperature difference between the body and its surroundings. This relationship follows Newton's law of cooling, which states that the rate of heat loss from a body is directly proportional to the temperature difference between the body and its surroundings. Since the temperature difference is the same (5°C) for both cooling intervals (75°C to 70°C and 70°C to 65°C), and assuming the cooling process continues to follow Newton's law of cooling, we can expect the same cooling time for both intervals. Therefore, the body will also cool down from 70°C to 65°C in 10 minutes, similar to the cooling time for the interval from 75°C to 70°C. So, the correct choice is: a) 10