The relation, TdS = dU + PdV, is valid for
TdS= dU + PdV
This equation holds good for any process reversible or irreversible, undergone by a closed system, since it is a relation among properties which are independent of the path.
The equation, δQ = dU + PdV, is true for
In statistical thermodynamics, entropy is defined as
1. measure of irreversibility of a system
2. a universal property
3. degree of randomness
4. thermodynamic probability of disorderness
Which of the above is/are correct
Energy tends over to gravitate to a lower degree of intensity so long as it undergoes no transformation.
Which law of thermodynamics is related to this statement
Consider the following statements:
In an irreversible process
1. entropy always increases
2. the sum of the entropy of all bodies taking part in a process always increases
3. once created, entropy can not be destroyed
Which among the above are correct?
a) An irreversible process increases the entropy of the universe. Because entropy is a state function, the change in entropy of the system is the same, whether the process is reversible or irreversible.
b) The total entropy of a system either increases or remains constant; it never decreases. Entropy is zero in a reversible process; it increases in an irreversible process.
c) Once some entropy is created in a process , the universe has to carry the burden of that entropy forever .
One kg of water at room temperature is brought into contact with a high temperature thermal reservoir. The entropy change of the universe is
For a thermodynamics cycle to be irreversible, it is necessary that
⇒For cycle is possible This is known as Clausius inequality.
Match List-I with List-ll and select the correct answer using the codes given below
A. Mechanical work
C. Zeroth law
D. H - TS
1. Clausius-Clapeyron equation
2. Gibb’s equation
3. High grade energy
4. Concept of temperature
G = H - TS
• Mechanical work is high grade energy
• Zeroth law gives the concept of temperature
• is known as Clausius inequality
Increase in entropy of a system represents
Increase in entropy of a system leads to increase in randomness and degradation of energy.
For reversible adiabatic process, change in entropy is
For reversible adiabatic process