Read the following passage and answer the (four) items that follow:
The transfer of heat and water vapor from the ocean to the air above it depends on disequilibrium at the interface of the water and the air. Within about a millimeter of the water, air temperature is close to that of the surface water and the air is nearly saturated with water vapor. But the differences, however small, are crucial, and the disequilibrium is maintained by air near the surface mixing with air higher up, which is typically appreciably cooler and lower in water-vapor content. The air is mixed by means of turbulence that depends on the wind for its energy. As wind speed increases, so does turbulence, and thus the rate of heat and moisture transfer. Detailed understanding of this phenomenon awaits further study. An interacting and complicating phenomenon is wind-to-water transfer of momentum that occurs when waves are formed. When the wind makes waves, it transfers important amounts of energy—energy that is therefore not available to provide turbulence
Q28. The passage suggests that if on a certain day the wind were to decrease until there was no wind at all which of the following would occur?
Read the following passage and answer the (four) items that follow:
The transfer of heat and water vapor from the ocean to the air above it depends on disequilibrium at the interface of the water and the air. Within about a millimeter of the water, air temperature is close to that of the surface water and the air is nearly saturated with water vapor. But the differences, however small, are crucial, and the disequilibrium is maintained by air near the surface mixing with air higher up, which is typically appreciably cooler and lower in water-vapor content. The air is mixed by means of turbulence that depends on the wind for its energy. As wind speed increases, so does turbulence, and thus the rate of heat and moisture transfer. Detailed understanding of this phenomenon awaits further study. An interacting and complicating phenomenon is wind-to-water transfer of momentum that occurs when waves are formed. When the wind makes waves, it transfers important amounts of energy—energy that is therefore not available to provide turbulence
Q28. The passage suggests that if on a certain day the wind were to decrease until there was no wind at all which of the following would occur?
The correct option is A (a) The air closest to the ocean surface would become saturated with water vapor
As the wind decreases, turbulence too will decrease which in turn hamper the transfer of heat and moisture between the surface air and the air higher up. Thus the surface would become saturated with moisture. Hence Option (a) is correct and Option (c) is wrong. This also means that Option (b) is wrong as without turbulence, the disequilibrium at the interface of the water and the air is not created and hence there will be no temperature and moisture difference.
Option (d) is incorrect because the air higher up is typically appreciably cooler and lower in water-vapor content.
(a) The air closest to the ocean surface would become saturated with water vapor
As the wind decreases, turbulence too will decrease which in turn hamper the transfer of heat and moisture between the surface air and the air higher up. Thus the surface would become saturated with moisture. Hence Option (a) is correct and Option (c) is wrong. This also means that Option (b) is wrong as without turbulence, the disequilibrium at the interface of the water and the air is not created and hence there will be no temperature and moisture difference.
Option (d) is incorrect because the air higher up is typically appreciably cooler and lower in water-vapor content.
