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Assertion (A): Cork is a good insulator.
Reason (R): Good insulators are highly porous.
- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R individually true but R in not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'A'. Can you explain this answer?
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Assertion (A): Cork is a good insulator.Reason (R): Good insulators ar...
It is the air which fills the cells in the cork that makes it an excellent thermal insulator. The same protective principle can also be found in other natural products, such as wool and feathers, and in industry, such as double glazed windows, for example. However, none of these materials have such a high level of insulation as cork.
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Assertion (A): Cork is a good insulator.Reason (R): Good insulators ar...
According to strength of materials cork is a material having 0 Poisson ration meaning it is having very very low ductility property indicating it is as equal as rigid body so acts as insulator
As it acts as a rigid body and have small micro porous hole as cork is made of wood option A is correct
As it acts as a rigid body and have small micro porous hole as cork is made of wood option A is correct
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Assertion (A): Cork is a good insulator.Reason (R): Good insulators ar...
Assertion (A): Cork is a good insulator.
Reason (R): Good insulators are highly porous.
The correct answer is option 'A' - Both A and R are individually true and R is the correct explanation of A.
Explanation:
Insulation and Porosity:
Insulation refers to the ability of a material to resist the flow of heat, electricity, or sound. Good insulators have low thermal conductivity, meaning they are not easily conductive to heat transfer. Porosity, on the other hand, refers to the presence of pores or voids in a material. Porous materials have small air pockets or spaces within them that can trap air or gas, resulting in low heat transfer.
Properties of Cork:
Cork is a natural material derived from the bark of the cork oak tree. It has several properties that make it a good insulator:
1. Low Thermal Conductivity: Cork has low thermal conductivity, which means it does not easily conduct heat. This property makes it suitable for insulation applications.
2. High Porosity: Cork is highly porous due to its unique cellular structure. It consists of cells that are filled with air or gas, providing insulation by trapping air and preventing heat transfer.
3. Low Density: Cork has a relatively low density, which contributes to its insulating properties. The low density combined with high porosity allows cork to provide effective thermal insulation.
4. Sound Insulation: Cork also exhibits good sound insulation properties. Its porous structure helps absorb and dampen sound waves, reducing noise transmission.
5. Non-Conductive: In addition to thermal insulation, cork is also a good electrical insulator. It does not conduct electricity, making it suitable for electrical insulation applications.
Explanation of the Reason:
The reason provided in the assertion-reason statement is that good insulators are highly porous. This is true because the presence of pores or voids in a material creates air pockets that hinder heat transfer. The porous nature of cork allows it to trap air, resulting in low thermal conductivity and making it a good insulator. Therefore, the reason (R) is a correct explanation of the assertion (A).
Conclusion:
In conclusion, cork is indeed a good insulator due to its low thermal conductivity, high porosity, and other properties. The reason provided in the statement correctly explains why cork is a good insulator, as good insulators are generally highly porous.
Reason (R): Good insulators are highly porous.
The correct answer is option 'A' - Both A and R are individually true and R is the correct explanation of A.
Explanation:
Insulation and Porosity:
Insulation refers to the ability of a material to resist the flow of heat, electricity, or sound. Good insulators have low thermal conductivity, meaning they are not easily conductive to heat transfer. Porosity, on the other hand, refers to the presence of pores or voids in a material. Porous materials have small air pockets or spaces within them that can trap air or gas, resulting in low heat transfer.
Properties of Cork:
Cork is a natural material derived from the bark of the cork oak tree. It has several properties that make it a good insulator:
1. Low Thermal Conductivity: Cork has low thermal conductivity, which means it does not easily conduct heat. This property makes it suitable for insulation applications.
2. High Porosity: Cork is highly porous due to its unique cellular structure. It consists of cells that are filled with air or gas, providing insulation by trapping air and preventing heat transfer.
3. Low Density: Cork has a relatively low density, which contributes to its insulating properties. The low density combined with high porosity allows cork to provide effective thermal insulation.
4. Sound Insulation: Cork also exhibits good sound insulation properties. Its porous structure helps absorb and dampen sound waves, reducing noise transmission.
5. Non-Conductive: In addition to thermal insulation, cork is also a good electrical insulator. It does not conduct electricity, making it suitable for electrical insulation applications.
Explanation of the Reason:
The reason provided in the assertion-reason statement is that good insulators are highly porous. This is true because the presence of pores or voids in a material creates air pockets that hinder heat transfer. The porous nature of cork allows it to trap air, resulting in low thermal conductivity and making it a good insulator. Therefore, the reason (R) is a correct explanation of the assertion (A).
Conclusion:
In conclusion, cork is indeed a good insulator due to its low thermal conductivity, high porosity, and other properties. The reason provided in the statement correctly explains why cork is a good insulator, as good insulators are generally highly porous.
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Assertion (A): Cork is a good insulator.Reason (R): Good insulators are highly porous.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R individually true but R in not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer?
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