Practice free Thermal Properties of Matter (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
How is the Kelvin absolute temperature scale (T) related to the Celsius scale ($T_C$)?
The summary provides the relation: 'The Kelvin absolute temperature scale (T) has the same unit size as the Celsius scale ($T_C$), but differs in the origin: $T_C = T - 273.15$.' This means $T = T_C + 273.15$.
Which of the following best describes temperature?
The text defines temperature as 'Temperature is a relative measure, or indication of hotness or coldness.'
The term 'hot' and 'cold' are considered relative terms. What does this imply about our perception of temperature by touch?
The text states, 'Note that hot and cold are relative terms, like tall and short. We can perceive temperature by touch. However, this temperature sense is somewhat unreliable and its range is too limited to be useful for scientific purposes.'
What is the primary reason for heat transfer between a system and its surroundings when their temperatures are different?
The text explains, 'It means that when the temperature of body, ice-cold water or hot tea in this case, and its surrounding medium are different, heat transfer takes place between the system and the surrounding medium, until the body and the surrounding medium are at the same temperature.'
Which of the following statements best describes the relationship between temperature and heat?
According to the NCERT text, 'Heat is a form of energy that flows between a body and its surrounding medium by virtue of temperature difference between them. The degree of hotness of the body is quantitatively represented by temperature.' This clearly distinguishes heat as energy transfer due to temperature difference, and temperature as a measure of the degree of hotness.
An ideal gas equation can be written as $PV = \mu RT$. What does $T$ represent in this equation?
The NCERT text states: 'The ideal gas equation connecting pressure (P), volume (V) and absolute temperature (T) is : $PV = \mu RT$'. Therefore, T represents absolute temperature, which is typically measured in Kelvin.
Which of the following phenomena is explained by the unreliability of our temperature sense?
The text states: 'We can perceive temperature by touch. However, this temperature sense is somewhat unreliable and its range is too limited to be useful for scientific purposes.' The scenario where two objects at the same temperature feel different to touch is a classic example of this unreliability, as it depends on their thermal conductivity, not just their actual temperature.
What is the primary condition for heat transfer to occur between a system and its surroundings?
The NCERT text clearly states: '...when the temperature of body... and its surrounding medium are different, heat transfer takes place between the system and the surrounding medium, until the body and the surrounding medium are at the same temperature.' This highlights the essential role of temperature difference in heat transfer.
How is the Kelvin absolute temperature scale ($T$) related to the Celsius scale ($T_C$)?
The summary explicitly provides the relation: '$T_C = T – 273.15$'. Rearranging this gives $T = T_C + 273.15$. The text also mentions 'K = °C + 273.15'.
Which of the following is NOT one of the three modes of heat transfer mentioned in the text?
Point 9 in the summary lists: 'The three modes of heat transfer are conduction, convection and radiation.' Absorption is a process related to heat but not a mode of transfer itself.
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