- Heat does not spontaneously flow from a colder body to a hotter one. Which of the following thermodynamics law states this?
a) Zeroth law of thermodynamics
b) First law of thermodynamics
c) Second law of thermodynamics
d) Third law of thermodynamics - Which of the following is an application of thermodynamics??
a) Refrigerators
b) Gas compressors
c) Power plants
d) All of the mentioned - Which of the following is a type of thermodynamic system??
a) Open system
b) Closed system
c) Thermally isolated system
d) All of the mentioned - Which of the following occurs without a change in the internal energy? (ppsc 2020)?
a) Isochoric process
b) Isenthalpic process
c) Steady-state process
d) none of these - What is the value of the absolute thermodynamic temperature scale??
a) 3K
b) 0K
c) 1K
d) none of these - Which of the following follows the Carnot theorem?
a) Heat engines
b) Gas turbine engines
c) Gas compressors
d) All of the mentioned - Which of the following processes is used to do maximum work done on the ideal gas that is compressed to half of its initial volume?
a) isothermal
b) isochoric
c) isobaric
d)adiabatic - What is the ratio of Cp/Cv for gas if the pressure of the gas is proportional to the cube of its temperature and the process is an adiabatic process? (PPSC 2021)?
a) 2
b) 3/2
c) 4/3
d) 5/3 - Which of the following laws was formulated by Nernst? (PPSC 2017)?
a) Third law of thermodynamics
b) Second law of thermodynamics
c) First law of thermodynamics
d) None of the above - The standard condition for enthalpy changes are?
a) the pressure of 100 kPa
b) temperature 298K
c) normal physical state
d) all of above - The application of law of thermodynamics to the enthalpy change was done by?
a) Newton
b) Hess’s
c) Lewis
d) Sophocles - Pick out the Clausius-Clapeyron equation from the following? (PPSC 2020)?
a) dP/dT = ΔH/TΔV
b) ln P = – (ΔH/RT) + constant
c) ΔF = ΔH + T [∂(ΔF)/∂T]P
d) None of these - Clausius Clapeyron equation applies to the _ process?
a) Sublimation
b) Melting
c) Vaporisation
d) All A., B. & C
14- What will be the value of ΔH, if the forward and reverse reactions have the same energy of activation? (PPSC 2017)?
a) ΔH = ΔG = ΔS = 0
b) ΔS = 0
c) ΔG = 0
d) ΔH = 0
15- What is the function of a catalyst in a chemical reaction??
a) decrease rate constant of reaction
b) increases activation energy of reaction
c) reduces enthalpy of reaction
d) does not affect the equilibrium constant of reaction
17- Which is true for the entropy of a spontaneous reaction? (PPSC 2021)?
a) ΔS(system) – ΔS(surroundings) > 0
b) ΔS(system) + ΔS(surroundings) > 0
c) ΔS(surroundings) > 0 only
d) ΔS(system) > 0 only
