337. In an isothermal process, the internal energy
A.Increases
B.Decreases
C.Remains constant
D.First increases and then decreases

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338. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant
A.Pressure
B.Temperature
C.Volume
D.Internal energy

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339. The first law of thermodynamics was developed by
A.Charles
B.Joule
C.Einstein
D.Kelvin

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340. According to first law of thermodynamics
A.Mass and energy are mutually convertible
B.Carnot engine is most efficient
C.Heat and work are mutually convertible
D.Mass and light are mutually convertible

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341. Total heat of a substance is also known as
A.Internal energy
B.Entropy
C.Thermal capacity
D.Enthalpy

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342. First law of thermodynamics
A.Enables to determine change in internal energy of the system
B.Does not enable to determine change in entropy
C.Provides relationship between heat, work and internal energy
D.All of the above

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343. Addition of heat at constant pressure to a gas results in
A.Raising its temperature
B.Raising its pressure
C.Raising its volume
D.Raising its temperature and doing ex-ternal work

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