If the ratio of specific heat of a gas at constant pressure to that at constant volume is γ, the change in internal energy of a mass of gas, when the volume changes from V to 2V constant pressure p, is 

(1) R/(γ1)

(2) pV

(3) pV/(γ1)

(4) γpV/(γ1)

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If heat given to a system is 6 kcal and work done is 6 kJ. Then the change in internal energy is :

(1) 19.1 kJ

(2) 12.5 kJ

(3) 25 kJ

(4) Zero

Concept Questions :-

First law of thermodynamics
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A monoatomic gas of n-moles is heated from temperature T1 to T2 under two different conditions (i) at constant volume and (ii) at constant pressure. The change in internal energy of the gas is 

(1) More for (i)

(2) More for (ii)

(3) Same in both cases

(4) Independent of number of moles

Concept Questions :-

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Can two isothermal curves cut each other

(1) Never

(2) Yes

(3) They will cut when temperature is 0°C

(4) Yes, when the pressure is critical pressure

Concept Questions :-

Types of processes
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A vessel containing 5 litres of a gas at 0.8 m pressure is connected to an evacuated vessel of volume 3 litres. The resultant pressure inside will be (assuming whole system to be isolated) 

(1) 4/3 m

(2) 0.5 m

(3) 2.0 m

(4) 3/4 m

Concept Questions :-

Types of processes
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For an isothermal expansion of a perfect gas, the value of ΔPP is equal -

(1) γ1/2ΔVV

(2) ΔVV

(3) γΔVV

(4) γ2ΔVV

Concept Questions :-

Types of processes
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If a gas is heated at constant pressure, its isothermal compressibility 

(1) Remains constant

(2) Increases linearly with temperature

(3) Decreases linearly with temperature

(4) Decreases inversely with temperature

Concept Questions :-

Types of processes
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In isothermal expansion, the pressure is determined by -

(1) Temperature only

(2) Compressibility only

(3) Both temperature and compressibility

(4) None of these

Concept Questions :-

Types of processes
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The isothermal bulk modulus of a perfect gas at normal pressure is -

(1) 1.013×105N/m2

(2) 1.013×106N/m2

(3) 1.013×1011N/m2

(4) 1.013×1011N/m2

Concept Questions :-

Types of processes
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In an isothermal change, an ideal gas obeys -

(1) Boyle's law

(2) Charle's law

(3) Gaylussac law

(4) None of the above

Concept Questions :-

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