If γ denotes the ratio of two specific heats of a gas, the ratio of slopes of adiabatic and isothermal PV curves at their point of intersection is 

(1) 1γ

(2) γ

(3) γ-1

(4) γ+1

Subtopic:  Types of Processes |
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Air in a cylinder is suddenly compressed by a piston, which is then maintained at the same position. With the passage of time 

1. The pressure decreases
2. The pressure increases
3. The pressure remains the same
4. The pressure may increase or decrease depending upon the nature of the gas
Subtopic:  Types of Processes |
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The adiabatic Bulk modulus of a perfect gas at pressure P is given by 

(1) P

(2) 2P

(3) P/2

(4) γ P

Subtopic:  Types of Processes |
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An adiabatic process occurs at constant 

(1) Temperature

(2) Pressure

(3) Heat

(4) Temperature and pressure

Subtopic:  Types of Processes |
 84%
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For adiabatic processes γ=CpCv 

(1) PγV = constant

(2) TγV = constant

(3) TVγ1 = constant

(4) TVγ = constant

Subtopic:  Types of Processes |
 90%
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An ideal gas is expanded adiabatically at an initial temperature of 300 K so that its volume is doubled. The final temperature of the hydrogen gas is (γ = 1.40)      [Given : 20.4 = 1.3 ]

(1) 227.36 K

(2) 500.30 K

(3) 454.76 K

(4) –47°C

Subtopic:  Types of Processes |
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In an adiabatic expansion of a gas, if the initial and final temperatures are \(T_1\) and \(T_2\), respectively, then the change in internal energy of the gas is:
1. \(\frac{nR}{\gamma-1}(T_2-T_1)\)
2. \(\frac{nR}{\gamma-1}(T_1-T_2)\)
3. \(nR ~(T_1-T_2)\)
4. Zero

Subtopic:  First Law of Thermodynamics |
 67%
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Helium at 27°C has a volume of 8 litres. It is suddenly compressed to a volume of 1 litre. The temperature of the gas will be [γ = 5/3] 

(1) 108°C

(2) 9327°C

(3) 1200°C

(4) 927°C

Subtopic:  Types of Processes |
 65%
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A cycle tyre bursts suddenly. This represents an 

(1) Isothermal process

(2) Isobaric process

(3) Isochoric process

(4) Adiabatic process

Subtopic:  Types of Processes |
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One mole of helium is adiabatically expanded from its initial state (Pi,Vi,Ti) to its final state (Pf,Vf,Tf). The decrease in the internal energy associated with this expansion is equal to

(1) CV(TiTf)

(2) CP(TiTf)

(3) 12(CP+CV)(TiTf)

(4) (CPCV)(TiTf)

Subtopic:  Types of Processes |
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