Q.1
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
Q.2
The change in volume V with respect to an increase in pressure P has been shown in the adjoining figure for a non-ideal gas at four different temperatures T1, T2, T3 and TThe critical temperature of the gas is [ CPMT 1986]
ch-12_que_no-152_img_no1.png
  • a) T1
  • b) T2
  • c) T3
  • d) T4
Q.3
According to the kinetic theory of gases, the intermolecular force between the gas molecules are
  • a)zero
  • b) very small
  • c)large
  • d)very large
Q.4
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
Q.5
The change in internal energy, when a gas is cooled from 927°C to 27°C
  • a)200%
  • b) 100%
  • c)300%
  • d) 400%
Q.6
The pressure exerted by an ideal gas at a particular temperature is directly proportional to:
  • a) The mean speed of the gas molecules
  • b) The mean of the square of speed of the gas molecules
  • c) The square of the mean speed of the gas molecules
  • d) The root mean square speed of the gas molecule
Q.7
Figure shows the volume (V) vs Temperature (T) graphs for certain amount of perfect gas at two pressure P1 and P2 Then.
ch-12_que_no-157_img_no1.png
  • a)P1=P2
  • b) P1 > P2
  • c)P1 < P2
  • d)P1 ≥ P2
Q.8
A container has an ideal gas at pressure of 5atmosphere and temperature 27°C. One third of the mass of the gas from the container is removed and temperature is increased by 60°C. The pressure of gas in the enclosure is
  • a) 5atm
  • b) 6 atm
  • c)4 atm
  • d)3 atm
Q.9
An ideal gas exerts a pressure P. The mean kinetic energy per unit volume is E. Which of the following relations is correct. [ MLNR 1994]
  • a) P=E
  • b) P=E/2
  • c)P=(2/3)E
  • d)P=(3/2)E
Q.10
the cylinder of capacity 200 litres is filled with hydrogen gas. The total average kinetic energy of translatory motion of molecules is 1.52×105 joules. The pressure of hydrogen in the cylinder is .. [ MPPMT 1993]
  • a) 2×105 N/m2
  • b) 3×105 N/m2
  • c) 4×105 N/m2
  • d) 5×105 N/m2
Q.11
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]
  • a)
    ch-12_qn-161choice_img_no1.png
  • b)
    ch-12_qn-161choice_img_no2.png
  • c)
    ch-12_qn-161choice_img_no3.png
  • d) γR
Q.12
A piece of iron is heated in a flame. It first becomesdull red then becomes reddish yellow and finallyturns to white hot. The correct explanation for theabove observation is possible by using
  • a) Stefan's Law
  • b) Wien's displacement Law
  • c) Kirchoff's Law
  • d) Newton's Law of cooling
Q.13
A gas is taken through the cycle A → B → C → A,as shown. What is the net work done by the gas?
ch-12_que_no-163_img_no1.png
  • a) 2000 J
  • b) 1000 J
  • c) Zero
  • d) –2000 J
Q.14
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) 4/3
  • b) 2
  • c) 5/3
  • d) 3/2
Q.15
e given (V – T) diagram, what is the relationbetween pressures P1 and P2?
ch-12_que_no-165_img_no1.png
  • a) P2 = P1
  • b) P2 > P1
  • c) P2 < P1
  • d) Cannot be predicted
Q.16
The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from T1K to T2K is [NEET 2013]
  • a)
    ch-12_qn-166choice_img_no1.png
  • b)
    ch-12_qn-166choice_img_no2.png
  • c)
    ch-12_qn-166choice_img_no3.png
  • d)
    ch-12_qn-166choice_img_no4.png
Q.17
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
  • b) 16P
  • c) 64P
  • d) 32P
Q.18
A thermodynamic system undergoes cyclic process ABCDA as shown in Fig. Theworkdone by the systemin the cycle is …. [ AIPMT 2014]
ch-12_que_no-168_img_no1.png
  • a) P0V0 /2
  • b) zero
  • c) P0V0
  • d) 2 P0V0
Q.19
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 205]
ch-12_que_no-169_img_no1.png
  • a) -12 kJ
  • b) 20 kJ
  • c) - 20 kJ
  • d) 20 J
Q.20
A Carnot engine, having an efficiency of η = 0.1 as heat engine, is used as a refrigerator. If the workdone on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is :
  • a) 1 J
  • b) 100 J
  • c) 99 J
  • d) 90 J
Q.21
The ratio of the specific heats γ=CP/CV in terms of degrees of freedom (n) is given by : … [ AIPMT 2015]
  • a)
    ch-12_qn-171choice_img_no1.png
  • b)
    ch-12_qn-171choice_img_no2.png
  • c)
    ch-12_qn-171choice_img_no3.png
  • d)
    ch-12_qn-171choice_img_no4.png
Q.22
Figure below shows two paths that may be taken by a gas to go from a state A to a state C In process AB, 400 J of heat is added to the system and in process BC, 100 J of heat is added to the system. The heat absorbed by the system in the process AC will be :
ch-12_que_no-172_img_no1.png
  • a) 300 J
  • b) 380 J
  • c) 500 J
  • d) 460 J
Q.23
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]
  • a) 1/2
  • b) 2/3
  • c) 3/4
  • d) 2
Q.24
The coefficient of performance of a refrigerator isIf the temperature inside freezer is -20°C, thetemperature of the surroundings to which it rejects heat is : …[ReAIPMT 2015]
  • a) 21°C
  • b) 31°C
  • c) 41°C
  • d) 11°C
Q.25
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 ?
  • a) Isothermal
  • b) Adiabatic
  • c) Isobaric
  • d) Isochoric
Q.26
A refrigerator works between 4째C and 30째C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is: (Take 1 cal = 4.2 Joules)
  • a) 2.365 W
  • b) 23.65 W
  • c) 236.5 W
  • d) 2365 W
Q.27
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.
Q.28
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
  • b) R
  • c) 3R/2
  • d) 5R/2
Q.29
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]
  • a)
    ch-12_qn-179choice_img_no1.png
  • b)
    ch-12_qn-179choice_img_no2.png
  • c)
    ch-12_qn-179choice_img_no3.png
  • d)
    ch-12_qn-179choice_img_no4.png
Q.30
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]
  • a) P/(kTV)
  • b) mkT
  • c) P/(kT)
  • d) Pm/(kT)
0 h : 0 m : 1 s