Q1. What is the formula for calculating the heat transfer in a substance? (2023)
Solution:
The formula for calculating the heat transfer in a substance is Q = mcΔT, where Q is the heat added, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.
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Q2. Which law states that the pressure of a gas is directly proportional to its temperature at constant volume? (2019)
Solution:
Gay-Lussac's Law states that the pressure of a gas is directly proportional to its temperature at constant volume.
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Q3. Which law states that the heat absorbed or released by a substance is proportional to the change in temperature? (2021)
Solution:
Calorimetry states that the heat absorbed or released by a substance is proportional to the change in temperature.
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Q4. What is the specific heat capacity of air at constant pressure? (2022)
Solution:
The specific heat capacity of air at constant pressure is approximately 1.005 J/kg·K.
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Q5. In which process does a substance change from solid to gas? (2022)
Solution:
The process in which a substance changes from solid to gas is called sublimation.
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Q6. Which of the following processes involves a change of state without a change in temperature? (2018)
Solution:
Melting involves a change of state (solid to liquid) without a change in temperature.
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Q7. What is the term for the temperature at which a substance changes from liquid to gas? (2023)
Solution:
The temperature at which a substance changes from liquid to gas is called the boiling point.
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Q8. In which process does a substance change from solid to gas without becoming liquid? (2022)
Solution:
The process in which a substance changes from solid to gas without becoming liquid is called sublimation.
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Q9. What is the specific heat capacity of iron? (2023)
Solution:
The specific heat capacity of iron is approximately 0.45 J/g·K.
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Q10. Which of the following materials has the highest thermal conductivity? (2020)
Solution:
Copper has the highest thermal conductivity among the given materials.
