(c) Both of these
   (d) None of these
Ans: (b)
239. The thermodynamical definition of an ideal gas implies that it is only
   temperature dependent and independent of its volume; it is the statement of :
   (a) Joule"s law
   (b) Joule-Kelvin"s
   (c) Wein"s law
   (d) Stefan"s law
Ans: (a)
240. In the porous plug experiment which one of the following physical
   quantity remains constant:
   (a) enthalpy
   (b) entropy
   (c) Both of these
   (d) None of these
Ans: (a)
241. Which one of the following has maximum energy? [IAS (Pre) 2009]
   (a) Violet light
   (b) Green light
   (c) Red light
   (d) Yellow light
Ans: (a)
242. The external work done is the maximum for the thermo dynamical
   expansion of which one of the following process:
   (a) adiabatic
   (b) isothermal
   (c) isobaric
   (d) isochoric
Ans: (c)
243. The energy radiance is maximum for the lowest wavelength; it is :
   (a) Wein"s law
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