Question

1L of water is kept in 4 different bowls having surface areas as 50 $m^2$, 100 $m^2$, 150 $m^2$, 200 $m^2$ respectively. Arrange the surface areas in the increasing order of rate of evaporation.

• A. $100m^2$ < $150m^2$ < $200m^2$ < $50m^2$
• B. $50m^2$ < $200m^2$ < $150m^2$ < $100m^2$
• C. $50m^2$ < $150m^2$ < $200m^2$ < $100m^2$
• D. $50m^2$ < $100m^2$ < $150m^2$ < $200m^2$

Answer 1

The correct option is D $50m^2$ < $100m^2$ < $150m^2$ < $200m^2$

Rate of evaporation is directly proportional to change in surface area. If the surface area is increased, then the amount of liquid exposed to atmosphere also increases. Hence, the rate of evaporation is in order of $50m^2$ < $100m^2$ < $150m^2$ < $200m^2$.