Physics - Heat & Thermo Question with Solution | TestHub
PhysicsHeat & ThermoThermal ExpansionMedium2 minQB
PhysicsMediumassertion reason
Assertion: An ice block can melt first at its bottom on a warmer support.
Reason: The support can conduct heat into the ice at the contact surface.
Options:
Answer:
A
Solution:
Two effects: (1) the pressure from the weight of the block lowers the melting point slightly (about 0.0075 K per atm, tiny for ordinary blocks); (2) the main practical reason is that heat enters from the warm surface or the warm melt-water collecting at the bottom. Melt water drains down, so the bottom remains in contact with warmer water or surface. Both are true. The Reason gives the physical cause of the Assertion. Correct option: (A).
Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion
⏱ 2mℹ️ Source: QB
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