The molar specific heats of an ideal gas at constant pressure and volume are denoted by CP and CV respectively. If γ=CP/CV and R is the universal gas constant, then CV is equal to

(1) 1+γ/1-γ
 

(2)R/(γ-1)
 

(3)(γ-1)/R
 

(4)γR

Subtopic:  Specific Heat |
 87%
From NCERT
NEET - 2013
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If Cp and Cv denote the specific heats (per unit mass) of an ideal gas of molecular weight M

(1) Cp-Cv=RM2                             

(2) Cp-Cv=R

(3) Cp-Cv=RM                               

(4) Cp-Cv=MR

Subtopic:  Specific Heat |
 58%
From NCERT
NEET - 2010
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At 10°C the value of the density of a fixed mass of an ideal gas divided by its pressure is x. At 110°C this ratio is 

(1) x

(2)383283x

(3)10110x

(4) 283383x

Subtopic:  Ideal Gas Equation |
 63%
NEET - 2008
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The ratio of two specific heats of gas Cp/Cv for argon is 1.6 and for hydrogen is 1.4. Adiabatic elasticity of argon at pressure P is E. Adiabatic elasticity of hydrogen will also be equal to E at the pressure :

(1) P                                       

(2) 87P

(3) 78P                                   

(4) 1.4P

Subtopic:  Specific Heat |
 59%
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One mole of a perfect gas in a cylinder fitted with a piston has a pressure P, volume V and temperature 273 K. If the temperature is increased by 1 K keeping pressure constant, the increase in volume is

(1) 2V273

(2) V91

(3) V273

(4) V

Subtopic:  Ideal Gas Equation |
 75%
From NCERT
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If 300 ml of a gas at 27°C is cooled to 7°C at constant pressure, then its final volume will be -

(1) 540 ml

(2) 350 ml

(3) 280 ml

(4) 135 ml

Subtopic:  Ideal Gas Equation |
 88%
From NCERT
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Which one of the following gases possesses the largest internal energy?

1. 2 moles of helium occupying 1m3 at 300 K
2. 56 kg of nitrogen at \(10^5 \mathrm{Nm}^{-2}\) and 300 K
3. 8 grams of oxygen at 8 atm and 300 K
4. \(6 \times 10^{26}\) molecules of argon occupying 40 m3 at 900 K


 

Subtopic:  Law of Equipartition of Energy |
From NCERT
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The mean free path of molecules of a gas, (radius r) is inversely proportional to :
(1) r3

(2) r2

(3) r

(4) √r

Subtopic:  Mean Free Path |
 80%
From NCERT
NEET - 2014
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A monoatomic gas at a pressure p, having a volume V expands isothermally to a volume 2 V and then adiabatically to a volume 16 V. The final pressure of the gas is: (take  γ=5/3)

(1) 64ρ

(2) 32ρ

(3) ρ/64

(4) 16ρ 

Subtopic:  Specific Heat |
 70%
From NCERT
NEET - 2014
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Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weight of A and B is:

(a)2/3

(b)3/4

(c)2

(d)1/2

Subtopic:  Ideal Gas Equation |
 86%
From NCERT
NEET - 2015
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