Q1: Boiling point of water gets lowered at high altitudes (e.g., hills), because

ANS:B - atmospheric pressure is low.

The boiling point of water gets lowered at high altitudes (e.g., hills) because atmospheric pressure is low. The boiling point of a liquid is the temperature at which its vapor pressure equals the pressure exerted on the liquid by its surroundings. At sea level or low altitudes, atmospheric pressure is higher, which means it exerts greater pressure on the surface of the liquid. As a result, the boiling point of water is higher at sea level due to the higher atmospheric pressure. Conversely, at higher altitudes such as hills or mountains, the atmospheric pressure is lower because there is less air above pushing down on the surface of the liquid. With lower atmospheric pressure, water molecules can escape into the air more easily, and therefore the boiling point of water decreases. This means that at higher altitudes, water boils at a lower temperature than at sea level. So, the correct answer is: atmospheric pressure is low.