Chapter 8 – Thermodynamics
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A sample of an ideal gas is taken through the cyclic process abca as shown in the figure. The change in the internal energy of the gas along the path ca is –180 J. The gas absorbs 250 J of heat along the path ab and 60 J along the path bc. The work done by the gas along the path abc is:
11
Sep
A sample of an ideal gas is taken through the cyclic process abca as shown in the figure. The change in the internal energy of the gas along the path ca is –180 J. The gas absorbs 250 J of heat along the path ab and 60 J along the path bc. The work done [...]
When heat Q is supplied to a diatomic gas of rigid molecules, at constant volume its temperature increases by ΔT. The heat required to produce the same change in temperature, at a constant pressure is :
10
Sep
When heat Q is supplied to a diatomic gas of rigid molecules, at constant volume its temperature increases by ΔT. The heat required to produce the same change in temperature, at a constant pressure is : at a constant pressure is : at constant volume its temperature increases by ΔT. The heat required to produce [...]
A cylinder with fixed capacity of 67.2 lit contains helium gas at STP. The amount of heat needed to raise the temperature of the gas by 20 C is :
10
Sep
A cylinder with fixed capacity of 67.2 lit contains helium gas at STP. The amount of heat needed to raise the temperature of the gas by 20 C is : A cylinder with fixed capacity of 67.2 lit contains helium gas at STP. The amount of heat needed to raise the temperature of the gas [...]
Two materials having coefficients of thermal conductivity ′ 3K ′ and ′ K ′ and thickness ‘d’ and ′ 3d ′ , respectively, are joined to form a slab as shown in the figure. The temperature of the outer surfaces are ′ θ2 ′ and ′ θ1 ′ respectively, (θ2 > θ1 ). The temperature at the interface is?
10
Sep
Two materials having coefficients of thermal conductivity ′ 3K ′ and ′ K ′ and thickness ‘d’ and ′ 3d ′ , respectively, are joined to form a slab as shown in the figure. The temperature of the outer surfaces are ′ θ2 ′ and ′ θ1 ′ respectively, (θ2 > θ1 ). The [...]
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(θ2 > θ1 ). The temperature at the interface is? ,
are joined to form a slab as shown in the figure. The temperature of the outer surfaces are ′ θ2 ′ and ′ θ1 ′ respectively ,
respectively ,
Two materials having coefficients of thermal conductivity ′ 3K ′ and ′ K ′ and thickness 'd' and ′ 3d ′ ,
The figure shows two process A and B for a gas. If ΔQ A and ΔQB are the amount of heat absorbed by the system in two cases. and ΔUA and ΔUB are changes in internal energies, respectively, then:
10
Sep
The figure shows two process A and B for a gas. If ΔQ A and ΔQB are the amount of heat absorbed by the system in two cases. and ΔUA and ΔUB are changes in internal energies, respectively, then: respectively The figure shows two process A and B for a gas. If ΔQ [...]
The given diagram shows four processes i.e., isochoric, isobaric, isothermal and adiabatic. The correct assignment of the processes, in the same order is given by :
10
Sep
The given diagram shows four processes i.e., isochoric, isobaric, isothermal and adiabatic. The correct assignment of the processes, in the same order is given by : in the same order is given by : isobaric isochoric isothermal and adiabatic. The correct assignment of the processes The given diagram shows four processes i.e. September 10, 2021 [...]
A thermally insulated vessel contains 150g of water at 0 C. Then the air from the vessel is pumped out adiabatically. A fraction of water turns into ice and the rest evaporates at 0 C itself. The mass of evaporated water will be closest to: (Latent heat of vaporization of water = 2.10×10^6 J kg^−1 and Latent heat of Fusion of water =3.36×10^5 J kg^−1 )
10
Sep
A thermally insulated vessel contains 150g of water at 0 C. Then the air from the vessel is pumped out adiabatically. A fraction of water turns into ice and the rest evaporates at 0 C itself. The mass of evaporated water will be closest to: (Latent heat of vaporization of water = 2.10×10^6 J kg^−1 [...]