Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Heat and Thermodynamics question

2015 · Q148
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Heat and Thermodynamics
  5. /2015 · Q148

Heat and Thermodynamics question

2015 · Q148

NEETPhysicsHeat and ThermodynamicsMCQ+4 / −1
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 weight of A and B is
  1. A
    2
  2. B
    12{1 \over 2}21​
  3. C
    23{2 \over 3}32​
  4. D
    34{3 \over 4}43​
View written solutionFree

Correct answer: D

From PV = nRT

PA=ρAMART{P_A} = {{{\rho _A}{M_A}} \over {RT}}PA​=RTρA​MA​​ and PB=ρBMBRT{P_B} = {{{\rho _B}{M_B}} \over {RT}}PB​=RTρB​MB​​

From question,

PAPB=ρAρBMAMB=2MAMB=32{{{P_A}} \over {{P_B}}} = {{{\rho _A}} \over {{\rho _B}}}{{{M_A}} \over {{M_B}}} = 2{{{M_A}} \over {{M_B}}} = {3 \over 2}PB​PA​​=ρB​ρA​​MB​MA​​=2MB​MA​​=23​

∴\therefore∴ MAMB=34{{{M_A}} \over {{M_B}}} = {3 \over 4}MB​MA​​=43​

PreviousNext

More from Heat and Thermodynamics

  • A Carnot engine, having an efficiency of as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is2015 · MCQ
  • The ratio of the specific heats Cv​Cp​​=γ in terms of degrees of freedom (n) is given by2015 · MCQ
  • 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… Includes diagram2015 · MCQ
  • 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 Includes diagram2015 · MCQ
  • A monatomic gas at a pressure P, having a volume V expands isothermally to a volume 2V and then adiabatically to a volume 16V. The final pressure of the gas is (Take γ = 5/3)2014 · MCQ
  • A thermodynamic system undergoes cyclic process ABCDA as shown in figure. The work done by the system in the cycle is Includes diagram2014 · MCQ
  • The mean free path of molecules of a gas, (radius r) is inversely proportional to2014 · MCQ
  • Which of the following relations does not give the equation of an adiabatic process, where terms have their usual meaning?2013 · MCQ