Thermal Equilibrium

If a closed system has adiabatic boundaries, then atleast one boundary must be:

 Which of the following is constant in a diathermic boundary?
 

 Which of the following is constant in a diathermic boundary?
 

Which one of the following is correct about an adiabatic boundary?

$n$ moles of an ideal gas undergoes a process $\mathrm{A}\to \mathrm{B}$ as shown in the figure. The maximum temperature of the gas during the process will be:

When the temperature of a body is equal to that of the surroundings then the body appears
 

Zeroth law of thermodynamics 

An adiabatic wall is one which

A diathermic wall is one which

When the temperature of a body is equal to that of the surroundings then the body appears
 

Zeroth law of thermodynamics 

Samples $A$ and$B$ are initially kept in the same state. They expand through adiabatic and isothermal processes respectively to the same final volume. If $P_A$ is final pressure of sample $A$ and $P_B$ that of sample $B$. Then

  What percentage of total heat supplied is used for doing work, If a gas is heated at constant pressure? (Given: $\gamma$ for gas =$\frac{4}{3}$ )

Which of the following is an equivalent V-T graph corresponding to the thermodynamic cycle given in the figure , where, $1\to 2$ is adiabatic. (Graphs are schematic and are not to scale)

Ice at $0^{o}C$ is added to $200 gm$ of water initially at ${70}^{o}C$ in a vacuum flask. When $50 gm$ of ice has been added and has all melted, the temperature of flask and contents is ${40}^{o}C$, When a further $80 gm$ of ice is added and has all melted, the temperature of the whole becomes ${10}^{o}C$. Neglecting heat lost to surroundings the latent heat of fusion of ice is :

Equal molecules of two gases are in thermal equilibrium. If $P_a$, $P_b$ and $V_a$, $V_b$ are their respective pressures and volumes, then which of the following relation is true?

The thermo emf E (in volts) of a certain thermocouple is found to vary with Q (in C) according to equation $\left(E=20Q-\frac{Q^2}{20},\right)\text{where} Q$ is temperature of the hot function, the cold function being kept at $0^{o}C$ . Then, the neutral temperature of the thermocouple is

An adiabatic process occurs in

There are four objects A, B, C and D. It is observed that A and B are in thermal equilibrium and C and D are also in thermal equilibrium. However, A and C are not in thermal equilibrium. We can conclude that

Area of piston is $1 {\mathrm{m}}^2$. When heat is supplied to the gas, it expands and displaces piston by $\frac{L}{2}$, where, $L=1 \mathrm{m}$. Natural length of springs $L=1 \mathrm{m}$. Spring constant $K=100 \mathrm{N} {\mathrm{m}}^{-1}$. The pressure of gas in final situation is (considering equilibrium)