Physics - Heat & Thermo Question with Solution | TestHub
PhysicsHeat & ThermoThermal ExpansionMedium2 minQB
PhysicsMediumstatement
The Pyrex glass is having very low coefficient of linear expansion. It is also used as a very good transparent heat resistor as compared to ordinary glass. Explain?
Evaluate the following statements.
Statement I: Low expansion reduces differential thermal strain and thermal-shock stress; it does not mean zero heat conduction.
Statement II: Pyrex has infinite thermal conductivity.
Options:
Answer:
B
Solution:
Sudden heating makes one part of the glass hotter and expand more than another part; the resulting stress is about . Pyrex has small , so the stress is small and the glass does not crack. 'Heat resistant' here means thermal-shock resistant, not a good thermal insulator. Statement I is true and Statement II false. Correct option: (B).
Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion
⏱ 2mℹ️ Source: QB
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