Q1: The intensity of rain is expressed in

ANS:B - cm/hour

The intensity of rain is typically expressed in cm/hour. Rainfall intensity refers to the rate at which precipitation falls over a specific area during a given period of time. It is commonly measured in units of length (such as centimeters) per unit of time (such as hours). Therefore, rainfall intensity is often expressed as the depth of rainfall accumulated over a specific area in a given time period, such as centimeters per hour (cm/hour). Expressing rainfall intensity in cm/hour allows for quantifying the rate at which rain falls and assessing its impact on various factors such as flooding, erosion, and runoff. Other common units for rainfall intensity include millimeters per hour (mm/hour) and inches per hour (in/hour), depending on regional preferences and conventions. While rainfall can accumulate over longer periods such as days, expressing intensity in cm/day is less common and typically used for broader climatological or hydrological analyses rather than immediate or short-term assessments of rainfall impact. Therefore, the correct unit for expressing the intensity of rain is cm/hour.