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Doctors Medicines MCQs Q&A

  1. Clothes kept bundled up inside a dark room. 
  2. Clothes kept spread out inside a dark room with fan on. 
  3. Clothes kept bundled up in sunlight. 
  4. Clothes kept spread out in sunlight. 
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Option 4 : Clothes kept spread out in sunlight. 

The correct answer is Clothes kept spread out in sunlight.

Concept:

Evaporation:

  • The process of a liquid changing into vapour (or gas) even its boiling point is called evaporation.
  • Factors affecting evaporation:
    • Temperature: The rate of evaporation increases by increasing the temperature of the liquid.
    • The surface area of the liquid: The rate of evaporation increases by increasing the surface area of the liquid. 
    • The humidity of Air: When the humidity of air is low, then the rate of evaporation is high, and water evaporates more readily.
    • Wind Speed: The rate of evaporation of liquid increases with increasing wind speed.

Explanation:

  • When the clothes are bundled up, the surface area is reduced and thus the rate of evaporation also reduces. 
  • When the clothes are in a dark room, there is no sunlight, and the temperature is low thus, the rate of evaporation is also low.
  • When clothes are spread in sunlight, both the surface area and temperature are increased leading to an increase in the rate of evaporation. 
  • Thus, the washed, wet clothes dry the fastest when clothes are kept spread out in sunlight. 
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