Two thermally insulated vessels 1 and 2 are filled with air at temperatures T1, T2, volume V1, V2 and pressure P1, P2 respectively. If the valve joining the two vessels is opened, the temperature inside the vessel at equilibrium will be

1. T1+T2                               

2. T1+T2/2

3. T1T2P1V1+P2V2P1V1T2+P2V2T1                 

4. T1T2P1V1+P2V2P1V1T2+P2V2T2

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For matter to exist simultaneously in gas and liquid phases :

1. The temperature must be 0 K.

2. The temperature must be less than 0°C.

3. The temperature must be less than the critical temperature.

4. The temperature must be less than the reduced temperature.

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The value of critical temperature in terms of Vander Waal’s constant a and b is

1. Tc=8 a27 Rb                           

2. Tc=a2 Rb

3. Tc=827 Rb                             

4. Tc=27 a8 Rb

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In Vander Waal’s equation, a and b represent P+aV2v-b=RT

1. Both a and b represent correction in volume

2. Both a and b represent adhesive force between molecules

3. a represents adhesive force between molecules and b correction in volume

4. a represents correction in volume and b represents adhesive force between molecules

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At 0°C the density of a fixed mass of a gas divided by pressure is x. At 100°C, the ratio will be:

1. x                                   

2. 273373x

3. 373273x                           

4. 100273x

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At what temperature volume of an ideal gas at 0°C becomes triple :

1. 546°C                                 

2. 182°C

3. 819°C                                 

4. 646°C

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Types of velocity
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If an ideal gas has volume V at 27°C and it is heated at a constant pressure so that its volume becomes 1.5V. Then the value of final temperature will be

1. 600°C                             

2. 177°C

3. 817°C                             

4. None of these

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A tyre kept outside in sunlight bursts off after sometime because of :

1. Increase in pressure                                 

2. Increases in volume

3. Both (a) and (b)                                       

4. None of these

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Specific heat
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In Boyle's law what remains constant :

1. PV                                     

2. TV

3. VT                                     

4. PT

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Equation of gas in terms of pressure (P), absolute temperature (T) and density (d) is :

1. P1T1d1=P2T2d2                                 

2. P1T1d1=P2T2d2

3. P1d2T1=P2d1T1                                 

4. P1d1T1=P2d2T2

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