An adiabatic process occurs at constant 

(1) Temperature

(2) Pressure

(3) Heat

(4) Temperature and pressure

Concept Questions :-

Types of processes
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A polyatomic gas γ=43 is compressed to 18 of its volume adiabatically. If its initial pressure is P0, its new pressure will be -

(1) 8 P0

(2) 16 P0

(3) 6 P0

(4) 2 P0

Concept Questions :-

Types of processes
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For adiabatic processes γ=CpCv 

(1) PγV = constant

(2) TγV = constant

(3) TVγ1 = constant

(4) TVγ = constant

Concept Questions :-

Types of processes
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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

Concept Questions :-

Types of processes
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In an adiabatic expansion of a gas initial and final temperatures are T1 and T2 respectively, then the change in internal energy of the gas is -

(1) Rγ1(T2T1)

(2) Rγ1(T1T2)

(3) R(T1T2)

(4) Zero

Concept Questions :-

First law of thermodynamics
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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

Concept Questions :-

Types of processes
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A cycle tyre bursts suddenly. This represents an 

(1) Isothermal process

(2) Isobaric process

(3) Isochoric process

(4) Adiabatic process

Concept Questions :-

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)

Concept Questions :-

Types of processes
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A diatomic gas initially at 18°C is compressed adiabatically to one-eighth of its original volume. The temperature after compression will be 

(1) 10°C

(2) 887°C

(3) 668 K

(4) 144°C

Concept Questions :-

Types of processes
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During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio Cp/Cv for the gas is 

(1) 32

(2) 43

(3) 2

(4) 53

Concept Questions :-

Types of processes
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