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.
Subtopic:  Ideal Gas Equation |
 84%
From NCERT
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The pressure and temperature of two different gases are P and T with volume V for each.  If they are mixed, keeping the same volume and temperature, the pressure of the mixture will be:

1. P/2 2. P
3. 2P 4. 4P
Subtopic:  Ideal Gas Equation |
 50%
From NCERT
PMT - 1997
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If the mean free path of atoms is doubled then the pressure of the gas will become:
1. \(P/4\)           
2. \(P/2\)           
3. \(P/8\)           
4. \(P\)

Subtopic:  Mean Free Path |
 64%
From NCERT
PMT - 2000
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A diatomic molecule has how many degrees of freedom-                                                                                             

(1) 3            (2) 4           (3) 5              (4) 6

Subtopic:  Law of Equipartition of Energy |
 83%
From NCERT
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A thermally insulated piston divides a container into two compartments.  Volume, temperature, and pressure in the right compartment are \(2V\), \(T\) and \(2P\), while in the left compartment the respective values are \(V\), \(T\) and \(P\).  If the piston can slide freely, then in the final equilibrium position, the volume of the right-hand compartment will be:

1. \(V\) 2. \(3V \over 5\)
3. \(9V \over 4\) 4. \(12V \over 5\)
Subtopic:  Ideal Gas Equation |
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The graph which represents the variation of mean kinetic energy of molecules with temperature t°C is ?

1. 2.
3. 4.

Subtopic:  Kinetic Energy of an Ideal Gas |
From NCERT
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Vrms,Vav,Vmp 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. Vrms<Vav<Vmp

2. Vrms>Vav>Vmp

3. Vrms < Vav>Vmp

4. Vavg>Vrms<Vmp

Subtopic:  Types of Velocities |
 82%
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Gas is found to obey the law P2V = constant. The initial temperature and volume are T0 and V0. If the gas expands to a volume 3V0, its final temperature becomes:

1. T03           

2. T03

3. 3T0           

4. None of these

Subtopic:  Ideal Gas Equation |
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For a gas, the r.m.s speed at 800 K is:

1. Four times the value at 200 K

2. Half the value at 200 K

3. Twice the value at 200 K

4. Same as at 200 K

Subtopic:  Types of Velocities |
 68%
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The average kinetic energy of a helium atom at 30°C is:                                                                                           [MP PMT 2004]

1. Less than 1 eV

2. A few KeV

3. 50-60 eV

4. 13.6 eV

Subtopic:  Kinetic Energy of an Ideal Gas |
From NCERT
PMT - 2004
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