Physics - Heat & Thermo Question with Solution | TestHub
PhysicsHeat & ThermoThermal ExpansionMedium2 minQB
PhysicsMediumassertion reason
Assertion: A fan can make a sweating person feel cooler without lowering room temperature.
Reason: The fan must lower the entire room air temperature below ambient.
Options:
Answer:
C
Solution:
A fan does not cool the air (its motor slightly warms it). It moves air over the skin, which carries away the humid layer next to the skin, so sweat evaporates faster and removes latent heat. It also increases convective heat loss from the body when the air is cooler than skin. Assertion is true, but Reason is false. Correct option: (C).
Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion
⏱ 2mℹ️ Source: QB
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