Practice free Thermodynamics (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The internal energy change in a system that has absorbed 2 Kcal of heat and done 500J of work is
$ \triangle Q = \triangle U + \triangle W $
Which of the following is not a thermodynamical function.
Work done is not a thermodynamic function because it depends on the path taken, rather than being a state function like Enthalpy, Gibbs energy, and Internal energy, which depend only on the initial and final states of the system.
Which of the following is not a thermodynamic co-ordinate.
In thermodynamics, the common thermodynamic coordinates are Pressure (P), Temperature (T), and Volume (V). The option 'R' is not considered a thermodynamic coordinate.
The work of 62-25 KJ is performed in order to compress one kilo mole of gas adiabatically and in this process the temperature of the gas increases by $ 5 ^\circ $. The gas is......... R = 8.3 J/molk
$ \triangle Q = \triangle U + \triangle W $ $ \triangle u = \triangle u - 62.25 (adiabatic process) $ $ u = 62.25 \times 10^3 J$ $C_v = { \triangle u \over n \triangle t } $ $ for monoatomic gas C_v = {3 \over 2} R = { 3 \over 2} \times 8 - 3 = 12.45 J / mol K $
Cp and Cv denote the specific heat of oxygen per unit mass at constant Pressure and volume respectively, then
$ If CP_1 and CV_1 is a molar specific heat CP_1 - CV_1 = R ......(i) $ $Cp = {Cp_1 \over 32} , Cv = {Cv_1 \over 32 } [ molar mass of O_2 = 32 ] $ From equation (i) 32Cp - 32Cv = R Cp - Cv = R/32
One kg of adiatomic gas is at a pressure of $ 5 \times 10 ^ 5 N/m^2 $ 5kg The density of the gas is $ 5 kg /m^3 $ what is theenergy of the gas due to its thermal motion ?
$ u = { 5 \over 2} lRT $ $ PV = l RT [diatomic gas]$ $ u = { 5 \over 2} PV$ $ V = { mass \over density } = { 1 \over 5} m^3 $
200g of water is heated from $ 25 ^\circ to 45 ^\circ $ Ignoring the slight expansion of the water the change in its internal energy is (Specific heat of wafer $ 1 cal / 9 ^\circ C $ )
$ \triangle u = mc \triangle T $
During an adiabatic process, the pressure of a gas I found to be propostional to the fifth power of its absolute temperature. The ratio $ {cp \over cv } $ for the gas is
$ given P \alpha T^5 $ $ an adiabatic process P \alpha T ^ { \wp \over \wp -1 } $
One mole of oxygen is heated at constant pressure stasting at $ 0 ^ \circ $ . How much heat energy in cal must be added to the gas to double its volume ? Take R = 2 cal / molk
$ \therefore { \wp \over \wp - 1} = 5 $
Heat capacity of a body depends on the .......... as well as on ..........
Heat capacity of a body is defined as the amount of heat required to change its temperature by one degree. It depends on the material of the body and its mass. Different materials have different specific heat capacities, and a larger mass requires more heat to achieve the same temperature change.
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