The question asks about the direction of heat flow when two bodies of different temperatures are in contact. This is a fundamental concept in thermodynamics, specifically related to the second law of thermodynamics.
A) The hotter body to the colder body. This statement correctly describes the natural direction of heat flow, which is from a region of higher thermal energy (hotter body) to a region of lower thermal energy (colder body) until thermal equilibrium is achieved.
The question asks about the fundamental principle behind the operation of a calorimeter. A calorimeter is a device used to measure the heat of chemical reactions or physical changes. Its function is directly related to how energy is transferred and accounted for within an isolated system.
Correct Option: B) Conservation of energy. A calorimeter measures heat changes based on the principle that in an isolated system, the total energy remains constant. Heat lost by one component is gained by another, allowing for the calculation of the heat of reaction or process.
This question pertains to the fundamental principle of calorimetry, which is based on the law of conservation of energy. When heat transfer occurs between objects in an isolated system, the total energy remains constant. This means that any heat lost by one object must be gained by another.
Correct Option: C) Equal to the heat gained by the cold object
This option correctly states the principle of calorimetry, which is based on the conservation of energy. In an ideal isolated system, all the heat given out by the hot body is absorbed by the cold body.
The question asks for the definition of an insulator. We need to understand the properties of insulators, particularly their interaction with heat and electricity, to identify the correct option.
Correct Option: C) Do not allow heat to flow easily
This statement accurately describes a key property of insulators. Materials like wood, plastic, and air are good thermal insulators because they resist the transfer of heat.
The question asks for the term that describes a material's opposition to heat flow. We need to evaluate each option to identify the correct physical property.
Correct Option: B) Thermal resistance is the property of a material that opposes the flow of heat through it. It is the reciprocal of thermal conductance and is analogous to electrical resistance.
The question asks to identify the material with the highest thermal conductivity among the given options. Thermal conductivity is a measure of a material's ability to conduct heat. Materials with high thermal conductivity are good heat conductors, while those with low thermal conductivity are good insulators.
Therefore, copper has the highest thermal conductivity.
Correct Option: C) Copper — Copper is a metal and is well-known for its excellent thermal conductivity, making it the best heat conductor among the given options.