An isolated system-

1.	is a specified region where transfer of energy and mass takes place
2.	is a region of constant mass and only energy is allowed through the closed boundaries
3.	is one in which mass within the system is not necessarily constant.
4.	cannot transfer neither energy nor mass to or from the surroundings.

 

$V_{rms},V_{av},V_{mp}$ are root mean square, average and most probable speeds of molecules of a gas obeying Maxwellian velocity distribution. Which of the following statements is correct?

1. $V_{rms}<V_{av}<V_{mp}$

2. $V_{rms}>V_{av}>V_{mp}$

3. $V_{rms} < V_{av}>V_{mp}$

4. $V_{avg}>V_{rms}<V_{mp}$

Gas is found to obey the law $P^{2}V$ = constant. The initial temperature and volume are $T_0$ and $V_0$. If the gas expands to a volume $3V_0$, its final temperature becomes:

1. $\frac{T_0}{3}$           

2. $\frac{T_0}{\sqrt{3}}$

3. $3T_0$           

4. None of these

The curve between absolute temperature and \(\mathrm{v}^2_{rms}\)${\mathrm{}}^{}$ is:

1.		2.
3.		4.

The root-mean-square (RMS) speed of oxygen molecules $\left(O_2\right)$ at a certain absolute temperature is v. If the temperature is doubled and the oxygen gas dissociates into atomic oxygen, the RMS speed would be:

1. V                       

2. $\sqrt{2}v$

3. 2 v                     

4. 2 $\sqrt{2}v$

At what temperature is the root mean square speed of molecules of hydrogen twice as that at STP?
1. \(273\) K
2. \(546\) K
3. \(819\) K
4. \(1092\) K

 Volume, pressure, and temperature of an ideal gas are \(V\), \(P\), and \(T\) respectively. If the mass of its molecule is \(m\), then its density is: [\(k\)=Boltzmann's constant]

In the adjacent V-T diagram what is the relation between $P_{1 }and P_2$ ?

1. $P_2=P_1$                               

2. $P_2>P_1$

3. $P_2<P_1$                                 

4. cannot be predicated

Which one of the following graph is correct at constant pressure?

1.		2.
3.		4.

The equation $\left(p+\frac{a}{v^2}\right)\left(v-b\right)=RT$ is known as:

1. Perfect gas equation

2. Joule Thomson's equation

3. Vander Waal's equation

4. Maxwell's equation