Q. Which of the following statements is/are correct ?

Thermodynamics Report Error

A

A gas has two specific heats only

B

A material will have only one specific heat, if and only if its coefficient of thermal expansion is equal to zero.

C

A gas has infinite number of specific heats.

D

None of these

Solution:

Depending upon the type of thermodynamic process the specific of a material changes due to change in work done by the substance in different cases. If during heating a substance volume does not change then work done by it will be zero hence there will be a single specific heat exist for that substance.

Questions from Thermodynamics

1. The concept of temperature in thermodynamics is suggested by the

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3. One mole of an ideal gas at temperature was cooled isochorically till the gas pressure fell from to . Then, by an isobaric process, the gas was restored to the initial temperature. The net amount of heat absorbed by the gas in the process is

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5. An ideal monoatomic gas is confined in a cylinder by a spring loaded piston of cros section . Initially the gas is at 300K and occupies a volume of and the spring is in its relaxed state as shown in figure. The gas is heated by a small heater until the piston moves out slowly by . The force constant of the spring is and the atmospheric pressure is . The cylinder and the piston are thermally insulated. The piston and the spring are massless and there is no friction between the piston and the cylinder. The final temperature of the gas will be :
(Neglect the heat loss through the lead wires of the heater. The heat capacity of the heater coil is also negligible)

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