Question

why do we prefer pressure cooker at hill stations for cooking rice ,pulses,gram etc?

Answer 1

At high altitudes pressure is very less due to which it takes much time to cook food as water reaches it boiling point very early even before the food is cooked so to increase pressure for proper cooking pressure cooker are preferred at high altitudes

Answer 2

At hill stations, the normal atmospheric pressure is less than the pressure at plains or at sea level. Due to this reason it takes longer time to cook food on hill stations.
A pressure cooker allows to maintain the desired pressure to cook food even at hill stations.