Which of the following is a TRUE statement? Energy can be transferred unassisted

Question

Which of the following is a TRUE statement? Energy can be transferred unassisted from a low temperature reservoir Energy can be created It is not possible to completely convert heat from a thermal revolt to work Reversible process is similar to a cyclic process Consider heat loss through the two walls of a home on a winter night. The walls are identical, except that one of them has a tightly fit glass widow identify the correct statement in this context Heat loss through the wall with the glass window will be smaller Heat loss through the wall with tie glass window will be zero. loss through the wall with the be larger. Heat loss through both the walls will be the same. The thermal conductivity of a material is a measure of how fast heat will be conducted in that material. Yes No

Explanation / Answer

Q1.

the true statement is :

it is not possible to completely convert heat from a thermal reservoir to work.

as 100% efficiency is only achieved at true zero temperature which is not physically reliable, total conversion of heat to work is not possible.

hence the third statement is true.

Q4.

the thermal conductivity of a material is a measure of how fast heat will be conducted in that material.

the statement is true.

as rate of flow of heat=thermal conductivity*area*temperature difference/thickness

thermal conductivity is directly proportional to rate of energy transfer.

Q5.

heat loss through the glass window will be smaller as thermal conductivty of glass is smaller than material of the wall.

hence first option is correct.

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