Q1: With rise in temperature, the heat capacity of a substance

ANS:A - increases

The heat capacity of a substance generally increases with a rise in temperature. This increase in heat capacity is primarily due to the increased vibrational and rotational motions of the atoms or molecules within the substance as temperature rises. These additional degrees of freedom lead to greater thermal energy absorption for a given increase in temperature, resulting in an increase in heat capacity. However, it's worth noting that for some substances, particularly those undergoing phase transitions or exhibiting anomalous behavior (like water near its boiling point), the heat capacity may exhibit complex behavior. So, the correct answer is: increases