Thermodynamic Processes

Q. Pressure versus temperature graphs of an ideal gas are as shown in figure. Choose the wrong statement

1. Density of gas is constant in graph (iii)
2. Density of gas is increasing in graph (i)
3. Density of gas is decreasing in graph (ii)
4. None of these

Q. From the following V-T diagram we can conclude

1. P₁ > P₂
2. P₁ < P₂
3. None of these
4. P₁ = P₂

Q. A pressure cooker contains air at 1 atm and ${30}^{\circ }$C. If the safety value of the cooler blows when the inside pressure $\ge$ 3 atm, then the maximum temperature of the air, inside the cooker can be

1. 90°C
2. 636°C
3. 363°C
4. 909°C

Q. A monatomic gas of mass $4.0\text{u}$ is kept in an insulated container. Container is moving with a velocity of $30\text{m/s}$. If the container is suddenly stopped, then the change in temperature of the gas is $\frac{x}{3R}$ $(R=$ gas constant$)$. Value of $x$ is.

Q.

Which amongst the following graphs represents the V-T graph shown in the figure?

1. 

2. 

3. 

4. 

Q.

An ideal gas at 300 K occupies a volume of 0.5 $m^3$ at a pressure of 2 atm. The gas expands adiabatically until its volume is 1.2 $m^3$. Next, the gas is compressed isobarically to its original volume. Finally, the pressure is increased isochorically until the gas returns to its initial state. Represent the change on the P-V diagram. Determine the temperature at the end of each transformation; and the work done during the cycle. Assume g = 1.4.

1. 1.2

2. 1.5

3. 1.9

4. 2.5

Q.

The work done by a gas when it undergoes a state change from 1 $\to$ 2 isothermally is

1. 

2. 

3. 

4. 

Q.

A typical dorm room or bedroom contains about 2500 moles of air. Find the change in the internal energy of this much air when it is cooled from ${35.0}^{\circ }C$ to ${26.0}^{\circ }C$ at a constant pressure of 1.00 atm. Treat the air as an ideal gas with $\gamma =1.400$.

1. 

2. 

3. 

4. 

Q. A heat engine employs the following process. A liquid is heated isobarically till it reaches its boiling point, then vaporizes isothermally. The vapors expand adiabatically. It cools and condenses into the liquid and is brought back to its initial position by compression. Plot the process on P - V diagram.

1. 3
2. 1
3. 2
4. 4

Q.

What happens to the temperature of a gas in adiabatic expansion?

1. Reduces

2. Increases

3. Remains constant

4. Need additional information