Heat and Thermodynamics
PART-A Unit-I: General Science
Previous Year Questions (PYQ) for this topic
Every TNPSC question asked from this topic, compiled as a PDF. · PDF 3.0 MB
Heat and Thermodynamics - PYQ Points
1. Laws of Thermodynamics
- Second Law: A refrigerator and ice factory operate based on the Second Law of Thermodynamics.
- Heat Transfer Principle: Without doing external work, heat cannot be transferred from a lower temperature to a higher temperature. A refrigerator transfers heat from a lower temperature region to a higher temperature region.
- Reversibility: The transition from normal state to superconducting state is reversible according to thermodynamics.
2. Modes of Heat Transfer
- Convection: Land breeze, sea breeze, and trade winds are formed due to convection.
- In Solids: In transparent solids, heat transfer occurs through conduction and radiation.
3. Pressure Cooker
Food cooks faster in a pressure cooker than in an ordinary vessel.
• Reason: Increased pressure raises the boiling point of water.
• In a pressure cooker, the boiling point of water is T > 100°C.
• Reason: Increased pressure raises the boiling point of water.
• In a pressure cooker, the boiling point of water is T > 100°C.
4. Properties of Ice
- Latent Heat of Fusion: Snow on mountains does not melt all at once because of its high latent heat of fusion.
- Change in Volume: Due to partial collapse of its tetrahedral crystal structure, the volume of ice
Free preview ends here
Practice
Practice quiz for this topic
28 questions · instant answer with an explanation
Premium members only