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प्रश्न
The first law of thermodynamics is concerned with the conservation of ______.
The first law of thermodynamics is consistent with the law of conservation of ______.
पर्याय
momentum
energy
temperature
mass
velocity
उत्तर १
The first law of thermodynamics is concerned with the conservation of energy.
Explanation:
The First Law of Thermodynamics states that heat is a form of energy, and thermodynamic processes are therefore subject to the principle of conservation of energy. This means that heat energy cannot be created or destroyed.
उत्तर २
The first law of thermodynamics is consistent with the law of conservation of energy.
संबंधित प्रश्न
Write the mathematical expression of the First Law of Thermodynamics for the Isobaric process.
A system can be taken from the initial state p1, V1 to the final state p2, V2 by two different methods. Let ∆Q and ∆W represent the heat given to the system and the work done by the system. Which of the following must be the same in both the methods?
The internal energy of an ideal gas decreases by the same amount as the work done by the system.
(a) The process must be adiabatic.
b) The process must be isothermal.
(c) The process must be isobaric.
(d) The temperature must decrease.
A thermally insulated, closed copper vessel contains water at 15°C. When the vessel is shaken vigorously for 15 minutes, the temperature rises to 17°C. The mass of the vessel is 100 g and that of the water is 200 g. The specific heat capacities of copper and water are 420 J kg−1 K−1 and 4200 J kg−1 K−1 respectively. Neglect any thermal expansion. (a) How much heat is transferred to the liquid-vessel system? (b) How much work has been done on this system? (c) How much is the increase in internal energy of the system?
50 cal of heat should be supplied to take a system from the state A to the state B through the path ACB as shown in figure. Find the quantity of heat to be suppled to take it from A to B via ADB.
The internal energy of a gas is given by U = 1.5 pV. It expands from 100 cm3 to 200 cm3against a constant pressure of 1.0 × 105 Pa. Calculate the heat absorbed by the gas in the process.
A gas is enclosed in a cylindrical vessel fitted with a frictionless piston. The gas is slowly heated for some time. During the process, 10 J of heat is supplied and the piston is found to move out 10 cm. Find the increase in the internal energy of the gas. The area of cross section of the cylinder = 4 cm2 and the atmospheric pressure = 100 kPa.
The compressibility of water is 5 × 10-10 m2/N. Pressure of 15 × 106 Pa is applied on 100 ml volume of water. The change in the volume of water is ______.
120 J of heat is added to a gaseous system, whose internal energy change is 60 J, then the amount of external work done is ____________.
Consider two containers A and B containing identical gases at the same pressure, volume and temperature. The gas in container A is compressed to half of its original volume isothermally while the gas in container B is compressed to half of its original value adiabatically. The ratio of final pressure of gas in B to that of gas in A is ______.
Three copper blocks of masses M1, M2 and M3 kg respectively are brought into thermal contact till they reach equilibrium. Before contact, they were at T1, T2, T3 (T1 > T2 > T3). Assuming there is no heat loss to the surroundings, the equilibrium temprature T is (s is specific heat of copper)
Consider a cycle followed by an engine (Figure)
1 to 2 is isothermal
2 to 3 is adiabatic
3 to 1 is adiabatic
Such a process does not exist because ______.
- heat is completely converted to mechanical energy in such a process, which is not possible.
- mechanical energy is completely converted to heat in this process, which is not possible.
- curves representing two adiabatic processes don’t intersect.
- curves representing an adiabatic process and an isothermal process don’t intersect.
Can a system be heated and its temperature remains constant?
A system goes from P to Q by two different paths in the P-V diagram as shown in figure. Heat given to the system in path 1 is 1000 J. The work done by the system along path 1 is more than path 2 by 100 J. What is the heat exchanged by the system in path 2?
Write the mathematical equation for the first law of thermodynamics for:
Isothermal process
A system is taken through a cyclic process represented by a circle as shown. The heat absorbed by the system is ______.
Mathematical equation of first law of thermodynamics for isochoric process is ______.
Which among the following equations represents the first law of thermodynamics under isobaric conditions?
If one mole of monoatomic gas `(gamma=5/3)` is mixed with one mole of diatomic gas `(gamma=7/5)`, the value of γ for the mixture is ______.
An ideal gas (γ = 1.5) is expanded adiabatically. How many times has the gas had to be expanded to reduce the root mean square velocity of molecules two times?
An ideal gas having pressure p, volume V and temperature T undergoes a thermodynamic process in which dW = 0 and dQ < 0. Then, for the gas ______.
104 J of work is done on a certain volume of a gas. If the gas releases 125 kJ of heat, calculate the change in internal energy of the gas.
In an adiabatic process, W = ______.
Using the first law of thermodynamics, show that for an ideal gas, the difference between the molar specific heat capacities at constant pressure and at constant volume is equal to the molar gas constant R.
What is Isobaric process?
Explain the formulation of first law of thrmodynamics.
Obtain an expression for the workdone by a gas in an isothermal process.
Write a short note on isobar.
Define isochoric process
