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341.

The mean free path of a gas least depends on

A.	viscosity of gas	B.	pressure of gas
C.	density of gas	D.	volume of gas

342.

Most of gases exhibit drop in temperature upon expansion. However, this may not be true in case of

A.	Carbondioxide	B.	Oxygen
C.	Hydrogen	D.	Helium

343.

For a gas the difference between the values of Cp and Cv aceounts for

A.	external work done	B.	increased kinetic energy of molecules
C.	increase in volume is more rapid as compared to that of pressure	D.	None of the above

344.

A gas having adiabatic index y = 1.4 and atmic weight A will have molecular weight

A.	A	B.	3A
C.	2A

345.

If a surface is elastically hit by N balls each of mass M, moving with same velocity V, the force on the surface will be

A.	MNV	B.	2 MNV
C.	2 MNV2	D.	4 MNV

346.

The specific heat at constant volume of solids obeys Deby's T3 law

A.	at high pressures	B.	at low pressures
C.	at low temperatures	D.	at all temperatures

347.

One litre of gas A and two litres of gas B. both having same temperature 100?C and same pressure 2.5 bar will have the ratio of kinetic energies of their molecules as

A.	1 ; 1	B.	1 ; 2
C.	1 ; 4	D.	4 ; 1

348.

The fastest moving gas molecules are those of

A.	Nitrogen	B.	Oxygen
C.	Chlorine	D.	Hydrogen

349.

The external work donw is zero all the following cases EXCEPT:

A.	Isothermal	B.	Constant volume
C.	Free expansiton	D.	Throttling

350.

Which of the following relation does not hold good for a throttling process?

A.	dW = 0	B.	dQ = 0
C.	dH = 0	D.	dS = 0