Chapter 11,12,13 Heat and Thermodynamics KTG
A Carnot engine having an efficiency of 1/10 as heat engine, is used as a refrigerator. If the work done onthe system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is … [ NEET 2017
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Thermodynamic processes are indicated in the following diagram.Match the following
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A given sample of an ideal gas occupies a volumeV at a pressure P and absolute temperature T. Themass of each molecule of the gas is m. Which ofthe following gives the density of the gas ?[ NEET II – 2016]
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The temperature inside a refrigerator is t2°C and the room temperature is t1°C. The amount of heatdelivered to the room for each joule of electricalenergy consumed ideally will be … [ NEET II – 2016]
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One mole of an ideal monatomic gas undergoes aprocess described by the equation PV3 = constant.The heat capacity of the gas during this process is…[ NEET II – 2016]
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A gas is compressed isothermally to half its initialvolume. The same gas is compressed separatelythrough an adiabatic process until its volume isagain reduced to half. Then :- [ AIPMT 2015]
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An ideal gas is compressed to half its initial volumeby means of several processes. Which of the processresults in the maximum work done on the gas ?
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The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is -20°C, thetemperature of the surroundings to which it rejects heat is : …[ReAIPMT 2015]
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Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular wigth of A and B is …[ REAIPMT 2015]
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The ratio of the specific heats γ=CP/CV in terms of degrees of freedom (n) is given by : … [ AIPMT 2015]
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One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure,The change in internal energy of the gas during the transition is : …[ NEET 2015]
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A thermodynamic system undergoes cyclic process ABCDA as shown in Fig. Theworkdone by the systemin the cycle is …. [ AIPMT 2014]
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A monoatomic gas at a pressure P, having avolumeVexpands isothermally to a volume 2V and then adiabatically to a volume 16V.The final pressure of the gas is …. (take γ = 5/3)[ AIPMT 2014]
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In the given (V – T) diagram, what is the relationbetween pressures P1 and P2?
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During an adiabatic process, the pressure of a gasis found to be proportional to the cube of its temperature.The ratio of Cp /Cv for the gas is
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A gas is taken through the cycle A → B → C → A,as shown. What is the net work done by the gas?
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The molar specific heats of an ideal gas at constantpressure and volume are denoted by Cp and Cv respectively. If γ=Cp/Cv and R is the universal gasconstant, then Cv is equal to … [ NEET 2013]
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An ideal gas exerts a pressure P. The mean kinetic energy per unit volume is E. Which of the following relations is correct.
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The change in internal energy, when a gas is cooled from 927°C to 27°C
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An ideal gas is allowed to expand freely against a vacuum in a rigid insulated container. The gas undergoes:
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According to the kinetic theory of gases, the intermolecular force between the gas molecules are
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Which of the following is not an assumption of kinetic theory of gases?
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Four molecules of gas are having speeds of 1,4,8 and 16 m/s. the root mean square velocity of the gas molecules is
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At room temperature the r.m.s speed of the molecules of certain diatomic gas is found to be 1930 m/s. The gas is
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By what percentage should the pressure of a given mass of gas be increased so as to decrease its volume by 10% at constant temperature?
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A sample of Oxygen gas and a sample of Hydrogen gas both have the same mass, the same volume and the same pressure. The ratio of their absolute temperature is
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At what temperature is the root mean square velocity of gaseous hydrogen molecules equal to that of oxygen molecules at 47°C?
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One kg of diatomic gas is at a pressure of 8×104N/m2. The density of the gas is 4kg/m3. What is the energy of the gas due to thermal motion? [ AIEEE 2009]
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If Cp and Cv denotes the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively then .. [ AIEEE 2007]
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A carnot engine, having an efficiency of η=1/10 s heat engine, is used as refrigerator. If the work done on the system is 10J, the amount of energy absorbed from the reservoir at low temperature is [ AIEEE 2007]
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The work of 146kJ is performed in order to compresses one kilo mole of gas adiabatic ally and in this process the temperature of the gas increased by 7°C. The gas is ( R=8.3 J mol-1K-1) [ AIEEE 2006]
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A system goes from A to B via two process I and II as shown in figure. If ΔU1 and ΔU2 are the changes in internal energies in the process I and II respectively, then [ AIEEE 2005]
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