# Heat and Thermodynamics

## Gas molecules of different masses in the same container have the same average transnational kinetic energy which is directly proportional to their

A.volume B.pressure C.absolute temperature D.time

## The performance of a refrigerator is described by

A.efficiency B.coefficient of performance C.both (a) and (b) D.not described

## Which one of correct relation ?

A.Cp+Cv=? B.Cp=1+R/Cv C.?=Cp/Cv D.Cp=1-R/Cv

## The purpose of flywheel in the engines is

A.to smooth out the energy variation B.to add more weight to engine to work it stable C.to start engine D.both (a) and (b)

## The reading on the Fahrenheit scale will be double the reading on the centigrade scale when the temperature on the centigrade scale is

A.460?C B.280?C C.360?C D.160?C

## The unit of entropy is

A.J.K B.J/K C.N.m/sec D.Kgm2/sec2.K

## The area enclosed by the curve ABCDA for a Carnot heat engine represents the work done by Carnot engine

A.at any instant B.averagely C.during its operation D.during one cycle

## Petrol engine is a

A.C.I engine B.SI engine C.IC engine D.all the above

## For a gas obeying Boyles law if the pressure is doubled the volume becomes

A.double B.one half C.four times D.one fourth

## Triple point of water is

A.273?C at 6.11 Kpa B.273K at 61.6 Kpa C.273.16?C at 0.611 Kpa D.273.16K at 750 Kpa