Current Affairs The work done by gas in going from state B to C is double the work done by gas in going from state A to B. The pressure of the gas in final state is. | If the work done by the engine when it transfers heat from reservoir to sink is \[12.6\times {{10}^{6}}J,\] the quantity of heat absorbed by the engine from the reservoir is. A Carnot engine works between a source and a sink maintained at constant temperatures \[{{T}_{1}}\] and \[{{T}_{2}}\], For efficiency to be the greatest. If \[{{L}_{1}}\] and \[{{L}_{2}}\] are the length of the gas column before and after expansion respectively, then \[\frac{{{T}_{1}}}{{{T}_{2}}}\] is given by, question_answer38) One mole of an ideal gas is taken from state A to state B by three different processes, (i) ACB (ii) ADB (iii) AEB as shown in the P-V diagram. | If such a gas at initial temperature T is adiabatically compressed to half the initial volume, its final temperature will be. FAQ The cycle consists of three steps: (i) an isothermal expansion \[(a\to b),\] (ii) an isobaric compression \[(b\to c),\] and (iii) a constant volume increases in pressure \[(c\to a).\] If \[{{T}_{a}}=400K,\] \[{{P}_{a}}=4atm,\]and \[{{P}_{b}}={{P}_{c}},=1atm,\] the work done by the gas per cycle is, A 500 ml sealed cylinder contains nitrogen at a pressure of 1 atm. Jobs THERMODYNAMICS Syllabus : First law of thermodynamics and its … question_answer62) The pressure-volume diagram shows six curved paths that can be followed by the gas (connected by vertical paths). If Q is positive, the system has gained energy (by heating).. | question_answer46) Which of the following graphs correctly represents the variation of \[\beta =\frac{dV/dP}{V}\] with P for an ideal gas at constant temperature? Browse videos, articles, and exercises by topic. The change in entropy: In Carnot engine efficiency is 40% at hot reservoir temperature T. For efficiency 50% what will be temperature of hot reservoir? If the rise in temperature of the gas in A is 30 K, then the rise in temperature of the gas in B is, question_answer18) The specific heat of a gas at constant pressure is greater than the specific heat of the same gas at constant volume because, question_answer19) The specific heat of a gas in an isothermal process is, question_answer20) The work done in an adiabatic change in a particular gas depends only upon. Sample Papers question_answer22) The slopes of isothermal and adiabatic curves are related as, question_answer23) 2 k mol of hydrogen at NTP expands isobarically to twice its initial volume. | The work done by gas in going from state B to C is double the work done by gas in going from state A to B. | The correct P-F diagram representing the two processes is: One mole of an ideal gas at an initial temperature of T K does 6R joules of word adiabatically. Ncert Solutions The values of x and n respectively are, Copyright © 2007-2020 | Current Affairs | Study Packages | Which of the following processes is irreversible? This unit is part of the Physics library. Its efficiency is, question_answer73) A Carnot engine whose efficiency is 50% has an exhaust temperature of 500 K. If the efficiency is to be 60% with the same intake temperature, the exhaust temperature must be (in K), question_answer74) For an ideal gas four processes are marked as 1, 2, 3 and 4 on P-V diagram as shown in figure. It is found that work done on the gas is 70% higher than what would be on an ideal gas. question_answer59) The temperature of source and sink of a heat engine are \[127{}^\circ C\] and \[27{}^\circ C\] respectively. Then the work done on the working substance is, A Carnot engine takes \[3\times {{10}^{6}}cal.\] of heat from a reservoir at \[\,627{}^\circ C,\]and gives it to a sink at \[27{}^\circ C.\] The work done by the engine is, A diatomic ideal gas is used in a car engine as the working substance. This implies that, question_answer40) A mass of diatomic gas \[(\gamma =1.4)\]at a pressure of 2 atmospheres is compressed adiabatically so that its temperature rises from \[27{}^\circ C\] to \[927{}^\circ C\]. Free Question Bank for 11th Class Physics Thermodynamical Processes Thermodynamics Conceptual Problems Here, heat, temperature, specific heat, and latent heat are concepts which are studied. A thermodynamic system undergoes cyclic process ABCDA as shown in fig. Let\[\Delta {{U}_{1}}\], \[\Delta {{U}_{2}}\]and \[\Delta {{U}_{3}}\]be the change in internal energy of the gas is these three processes. First Law of Thermodynamics This law states that energy is conserved in a closed system. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, the final temperature of gas will be, In pressure-volume diagram, the isochoric, isothermal, isobaric and iso-entropic parts respectively, are. Thermodynamics definition, the science concerned with the relations between heat and mechanical energy or work, and the conversion of one into the other: modern thermodynamics deals with the properties of systems for the description of which temperature is a necessary coordinate. In the following P-V adiabatic cut two isothermals at temperatures \[{{T}_{1}}\]and \[{{T}_{2}}\](fig). Newton’s law of cooling is another important topic studied under the thermodynamics of physics. A tiny glass tube lies at the bottom of the cylinder. | If a given mass of an ideal gas followed a relation VT = constant during a process, then which of the following graphs correctly represents the process? If the tyre bursts suddenly at temperature 300 K, what will be the new temperature? | W along the path ibf is. Which of the following holds good for an isochoric process? 6 Diagnostic Tests 149 Practice Tests Question of the Day Flashcards Learn by … A monatomic ideal gas, initially at temperature \[{{T}_{1}}\] is enclosed in a cylinder fitted with a frictionless piston. Franchise https://www.studyadda.com If the system is returned to state 1 and \[{{Q}_{1\to 2}}+10kJ\] the work done \[{{W}_{1\to 2}}\]is, During an adiabatic process of an ideal gas, if P is proportional to \[\frac{1}{{{V}^{1.5}}}\], then the ratio of specific heat capacities at constant pressure to that at constant volume for the gas is. | The gas is allowed to expand adiabatically to a temperature \[{{T}_{2}}\,\] by releasing the piston suddenly. Then it is heated at constant volume by supplying 150 J of energy. | The branch of science called thermodynamics deals with systems that are able to transfer thermal energy into at least one other form of energy (mechanical, electrical, etc.) | question_answer41) One mole of an ideal gas goes from an initial stated to final state B via two processes: It first undergoes isothermal expansion from volume V to 3 V and then its volume is reduced from 3V to Fat constant pressure. | Starting with the same initial conditions, an ideal gas expands from volume \[{{V}_{1}}\] to \[{{V}_{2}}\] in three different ways. The key concept is that heat is a form of energy corresponding to a definite amount of mechanical work. | A certain diatomic gas has the same specific heats as an ideal gas but a slightly different equation of state:\[PV=R(T+\alpha {{T}^{2}}),\]\[\alpha =0.001{{K}^{-1}}.\]The temperature of the gas is raised from \[{{T}_{1}}=300K\]to \[{{T}_{2}}\] at constant pressure. | Enter OTP. question_answer25) Choose the incorrect statement related to an isobaric process. During an adiabatic process an object does 100 J of work and its temperature decreases by 5K. The gas has a higher ternperature \[\,{{T}_{2}}\] at the final states a and b, which it can reach the paths shown. | The relation between U, P and V for an ideal gas in an adiabatic process is given by relation \[U=\text{ }a+bPV.\] Find the value of adiabatic exponent \[\left( \gamma \right)\]of this gas. When the state of a gas adiabatically changed from an equilibrium state A to another equilibrium state B an amount of work done on the system is 35 J. During another process it does 25J of work and its temperature decreases by 5K. Then \[{{T}_{1}}\]and \[{{T}_{2}}\] are, respectively, question_answer71) If the co-efficient of performance of a refrigerator is 5 and operates at the room temperature \[\]the temperature inside the refrigerator is, question_answer72) The temperature-entropy diagram of a reversible engine cycle is given in the figure. There are two processes ABC and DBF. For an ideal gas graph is shown for three processes, Process 1, 2 and 3 are respectively. | | The amount of heat supplied to the gas in the process 1, 2, 3 and 4 are \[{{Q}_{1}}\], \[{{Q}_{2}}\], \[{{Q}_{3}}\] and \[{{Q}_{4}}\] respectively, then correct order of heat supplied to the gas is [AB is process-1, AC is process-2, AD is adiabatic process-3 and AE is process-4]. Test Series The work done during isobaric compression is, 1 gm of water at a pressure of \[1.01\times {{10}^{5}}\] Pa is converted into steam without any change of temperature. In particular, it describes how thermal energy is converted to and from other forms of energy and how it affects matter. At what volume will the entropy of gas be maximum? Choose from 500 different sets of thermodynamics physics flashcards on Quizlet. question_answer58) A Carnot engine works between a source and a sink maintained at constant temperatures \[{{T}_{1}}\] and \[{{T}_{2}}\], For efficiency to be the greatest. Physics is the basic physical science.Until rather recent times physics and natural philosophy were used interchangeably for the science whose aim is the discovery and formulation of the fundamental laws of nature. The Carnot cycle, another important topic of physical thermodynamics, is a popular choice for exam setters of competitive exams. 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