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
a) 1 J
b) 90 J
c) 99 J
d) 100 J
Thermodynamic processes are indicated in the following diagram.Match the following
a) a) P → a, Q → c, R → d, S → b
b) P → c, Q → a, R → d, S → b
c) P → c, Q → d, R → b, S → a
d) P → d, Q → b, R → a, S → c
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]
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]
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]
a) 2 R
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]
a) Compressing the gas isothermally will requiremore work to be done
b) Compressing the gas through adiabatic process will require more work to be done.
c) Compressing the gas isothermally oradiabatically will require the same amount ofwork.
d) Which of the case (whether compressionthrough isothermal or through adiabaticprocess) requires more work will depend uponthe atomicity of the gas.
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 ?
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]
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]
The ratio of the specific heats γ=CP/CV in terms of degrees of freedom (n) is given by : … [ AIPMT 2015]
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]
a) -12 kJ
b) 20 kJ
c) - 20 kJ
d) 20 J
A thermodynamic system undergoes cyclic process ABCDA as shown in Fig. Theworkdone by the systemin the cycle is …. [ AIPMT 2014]
a) P0V0 /2
d) 2 P0V0
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]
a) P/ 64
In the given (V – T) diagram, what is the relationbetween pressures P1 and P2?
a) P2 = P1
b) P2 > P1
c) P2 < P1
d) Cannot be predicted
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
A gas is taken through the cycle A → B → C → A,as shown. What is the net work done by the gas?
a) 2000 J
b) 1000 J
d) –2000 J
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]
An ideal gas exerts a pressure P. The mean kinetic energy per unit volume is E. Which of the following relations is correct.
The change in internal energy, when a gas is cooled from 927°C to 27°C
An ideal gas is allowed to expand freely against a vacuum in a rigid insulated container. The gas undergoes:
a) An increase in its internal energy
b) A decrease in its internal energy
c)Neither an increase nor decrease in temperature or internal energy
d)An decrease in temperature
According to the kinetic theory of gases, the intermolecular force between the gas molecules are
b) very small
Which of the following is not an assumption of kinetic theory of gases?
a) Matter is composed of tiny discrete particles called molecules
b) All molecules have same size and mass
c)All molecules are in constant motion
d)The difference between the solid, liquid and gaseous state of matter lies in the relative freedom of motion of their respective molecules
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
b) 52.56 m/s
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
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?
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
At what temperature is the root mean square velocity of gaseous hydrogen molecules equal to that of oxygen molecules at 47°C?
a) 20 K
b) 80 K
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]
If Cp and Cv denotes the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively then .. [ AIEEE 2007]
a) Cp - Cv=28R
b) Cp - Cv=R/28
c) Cp - Cv=R/14
d) Cp - Cv=R
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]
a) 100 J
b) 99 J
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]
c)a mixture of monoatomic and diatomic
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]
a) relation between ΔU1 and ΔU2 can not be determined
b) ΔU1 = ΔU2
c) ΔU2 < ΔU1
d) ΔU2 > ΔU1
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