VIT - VITEEE 2025
National level exam conducted by VIT University, Vellore | Ranked #11 by NIRF for Engg. | NAAC A++ Accredited | Last Date to Apply: 7th April | NO Further Extensions!
Heat, Internal energy and Work in Thermodynamics is considered one of the most asked concept.
43 Questions around this concept.
In a given process of an ideal gas dW=0 and dQ<0. Then for the gas
Which statement is true for heat energy?
A system goes from 1 to 2 via three process A,B,and C as shown in figure.
For which process the work done will be maximum
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Which of the following statements is correct for any thermodynamic system?
Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will
An insulated container of gas has two chambers separated by an insulating partition. One of the chambers has volume and contains ideal gas at pressure
and temperature
. The other chamber has volume
and contains ideal gas at pressure
and temperature
. If the partition is removed without doing any work on the gas, the final equilibrium temperature of the gas in the container will be
A sample of gas expands from V1 to V2. In which of the following, the work done will be greatest?
National level exam conducted by VIT University, Vellore | Ranked #11 by NIRF for Engg. | NAAC A++ Accredited | Last Date to Apply: 7th April | NO Further Extensions!
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Two thermally insulated vessels 1 and 2 are filled with air at temperatures volume
and pressure
respectively. If the valve joining the two vessels is opened, the temperature inside the vessel at equilibrium will be
Choose the correct statement regarding internal energy
The change in internal energy when an ideal gas is expanded from volume
Quantities Involved in First Law of Thermodynamics -
(a) Heat (Q) : It is the energy that is transferred between a system and its environment because of the temperature gradient.
(b) Work (W) : Work can be defined as the energy that is transferred from one body to the other owing to a force that acts between them.
(C) Internal energy (U) : Internal energy of a system is the energy possessed by the system due to molecular motion and molecular configuration.
Types of internal energy -
Due to molecular motion internal energy is kinetic internal energy (UK).
Due to molecular configuration, it is called internal potential energy (UP).
Important points :
Heat and work are path dependent quantities and Internal energy is point function.
2.
The area of P-v diagram on volume axis give the work done in a reversible process. Also for quasistatic process work is given by
4. And for a cyclic process the clockwise area will show positive work and anticlockwise area will show the negative work done.
5. Internal energy of an ideal gas is totally kinetic and is given by
So, Internal energy of an ideal gas is the function of temperature only.
6. For heat transfer -
or,
Where,
Sign of dQ(Heat)
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