Comprehensive Guide: Important Question
Welcome to our definitive resource for Important conceptual questions of class 12 first law of thermodynamics. As students prepare for the upcoming NEB (National Examination Board) examinations, having access to high-quality, structured study materials is the difference between an average score and achieving distinction. This specific study module focuses deeply on core concepts within Important Question, completely aligned with the latest updated curriculum for the 2082/2083 academic session.
The document provided below contains expertly curated past paper solutions, essential theoretical summaries, and step-by-step problem-solving techniques. By thoroughly reviewing this material, students will develop a stronger foundation in Important Question, allowing them to tackle both conceptual and numerical exam questions with confidence. Examiners frequently test these specific conceptual frameworks, making this a critical area for high-yield revision.
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- Can the temperature of an isolated system changes?
Ans: Yes, in adiabatic process, the temperature of an isolated system changes. - When the air of the atmosphere rises up, it cools. Why?
Ans:When air rises, it expands due to decrease in the atmospheric pressure. As the expansion occurs in the air, it becomes cool. - What is the change in the internal energy of a gas which is compressed isothermally?
Ans: Internal energy is the function of temperature. During isothermal compression the temperature of the gas does not change. Therefore, the internal energy of the gas remains the same. - Ice at 0°C is heated to be converted into steam at 100°C. State the isothermal changes in the process of conversion of ice into stema.
Ans: In isothermal process, temperature remains constant. When ice melts at 0°C to water at 0°C and when water boils at 10°C to become steam at 100°C are the isothermal changes. - What happens to the air temperature in a valley when cold air blowing across the mountain tops descends into the valley?
Ans: As the cold air blowing across the mountain tops descends into the valley, it is adiabatically compressed. Consequently, the temperature in the valley is increased. - While stirring a liquid, it becomes warm. Is it reversible process?
Ans: While stirring a liquid some work is done on the system and it gets converted into heat. But, the heat cannot be converted back into the work. Hence it is not reversible process. - Can two isothermal curves intersect each other?
Ans: If two isothermal curves intersect each other, a gas will have the same values of pressure and volume at two different temperatures, which is imposssible. Hence, two isothermal curves do not intersect each other.