Materials science of waterproof fabrics: Why are raincoats and tents waterproof? Consider the property or treatment that prevents water penetration through fabric. Choose the correct option.
IIT JEE
Physics
Difficulty: Easy
Choose an option
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ABecause of surface tension of water alone
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BDue to tight weaving only with no coating
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CBecause they are coated/laminated (e.g., with rubber, PVC, PU) to block pores and prevent capillary action
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DBecause water has zero viscosity
Answer
Correct Answer: Because they are coated/laminated (e.g., with rubber, PVC, PU) to block pores and prevent capillary action
Explanation
ConceptWaterproofing is achieved by applying impermeable coatings/laminates that seal fabric pores and suppress capillary wicking. Surface tension alone cannot guarantee waterproofing under pressure.
Final AnswerBecause they are coated/laminated (e.g., with rubber, PVC, PU) to block pores and prevent capillary action