Heat — Flashcards
Telangana Board · Class 9 · Physical Science
20 flashcards for Heat (Telangana Board Class 9 Physical Science) to test yourself on key terms and facts. Sample: "A metal spoon and wooden spoon are.
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A metal spoon and wooden spoon are left in hot water for 5 minutes. Which one will feel hotter when you touch it and why?
Answer
The metal spoon will feel hotter. Metals are good conductors of heat, so they transfer heat energy more quickly from hot water to your skin. Wood is a poor conductor, so it transfers less heat energy …
What is heat and how is it different from temperature?
Answer
Heat is energy in transit that flows from a hotter body to a colder body. Temperature is a measure of the degree of hotness or coldness of a body. Heat is the energy that flows, while temperature dete…
Calculate the heat required to raise the temperature of 2 kg of water from 20°C to 80°C. (Specific heat of water = 4180 J/kg-K)
Answer
Given: m = 2 kg, ΔT = 80°C - 20°C = 60°C = 60K, s = 4180 J/kg-K Using Q = msΔT Q = 2 × 4180 × 60 = 501,600 J = 501.6 kJ Therefore, 501.6 kJ of heat is required.
Why does water have such a high specific heat capacity and what are its practical implications?
Answer
Water has high specific heat (4180 J/kg-K) because heat energy is used for breaking hydrogen bonds between molecules, not just increasing kinetic energy. Practical implications: Ocean temperature rema…
What happens during thermal equilibrium? Give an example from daily life.
Answer
Thermal equilibrium occurs when two bodies in contact reach the same temperature and no heat flows between them. Example: When you put a thermometer in your mouth, initially heat flows from your body …
Why does a samosa appear cool outside but feel hot when you bite into it?
Answer
The outer covering (bread) has lower specific heat and cools down quickly. The inner filling (vegetables/curry) has higher specific heat capacity due to water content and retains heat longer. This is …
What is the principle of method of mixtures? State its mathematical form.
Answer
When bodies at different temperatures are brought into thermal contact, net heat lost by hot bodies equals net heat gained by cold bodies until thermal equilibrium is reached. Mathematical form: Heat …
How does evaporation cool the surroundings? Explain with the example of sweating.
Answer
During evaporation, high-energy molecules escape from the liquid surface, leaving behind molecules with lower average kinetic energy, thus cooling the liquid. When we sweat, water evaporates from skin…
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