Thermodynamics (Phy)
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Thermodynamics (Phy)
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25 Questions

1. An ideal gas A and a real gas B have their volumesincreased from V to 2V under isothermal conditionsTheincrease in internal energy [1993]
2. Which of the following processes is reversible?[2005]
3. During an isothermal expansion - a confined idealgas does -“150 J of work against its surroundingsThisimplies that [2011]
4. If ΔU and ΔW represent the increase in internalenergy and work done by the system respectively in athermodynamical process - which of the following istrue? [2010]
5. A diatomic gas initially at 18°C is compressedadiabatically to one eighth of its original volumeThetemperature after compression will be [1996]
6. The molar specific heat at constant pressure of anideal gas is (7/2) RThe ratio of specific heat at constantpressure to that at constant volume is [2006]
7. At 27° Ca gas is compressed suddenly such that itspressure becomes (1/8) of original pressureFinaltemperature will be (γ= 5/3) [1989]
8. Which of the following relations does not give theequation of an adiabatic process - where terms have theirusual meaning?
9. A Carnot engine whose sink is at 300 K has anefficiency of 40%By how much should the temperatureof source be increased so as to increase - its efficiency by50% of original efficiency? [2006]
10. An ideal gas at 27°C is compressed adiabatically to8/27 of its original volumeThe rise in temperature is (γ= 5/3)[1999]
11. A Carnot engine whose efficiency is 50% has anexhaust temperature of 500 KIf the efficiency is to be60% with the same intake temperature - the exhausttemperature must be (in K) [2002]
12. A gas at 27°C temperature and 30 atmosphericpressure is allowed to expand to the atmosphericpressureIf the volume becomes 10 times its initialvolume - then the final temperature becomes [2001]
13. The temperature of source and sink of a heatengine are 127°C and 27°C respectivelyAn inventorclaims its efficiency to be 26% - then: [2001]
14. An ideal gas heat engine operates in Carnot cyclebetween 227°C and 127°CIt absorbs 6 × 10 4 cals of heatat higher temperatureAmount of heat converted towork is [2005]
15. One mole of an ideal gas at an initial temperatureof T K does 6R joules of work adiabaticallyIf the ratio ofspecific heats of this gas at constant pressure and atconstant volume is 5/3 - the final temperature of gas willbe [2004]
16. Amass of diatomic gas (γ = 1.4) at a pressure of 2atmospheres is compressed adiabatically so that itstemperature rises from 27°C to 927°CThe pressure ofthe gas in final state is [2011M]
17. An engine has an efficiency of 1/6When thetemperature of sink is reduced by 62°C - its efficiency isdoubledTemperature of the source is [2007]
18. A reversible engine converts one-sixth of the heatinput into workWhen the temperature of the sink isreduced by 62°C - the efficiency of the engine is doubled.The temperatures of the source and sink are [2000]
19. During an adiabatic process - the pressure of a gasis found to be proportional to the cube of itstemperatureThe ratio of C p/Cv for the gas is[NEET2013]
20. An ideal gas heat engine operates in a Carnot cyclebetween 227°C and 127°CIt absorbs 6 kcal at the highertemperatureThe amount of heat (in kcal) convertedinto work is equal to
21. A sample of gas expands from volume V1 to V2Theamount of work done by the gas is greatest - when theexpansion is [1997]
22. 110 joules of heat is added to a gaseous system - whose internal energy is 40J then the amount ofexternal work done is [1993]
23. An ideal carnot engine - whose efficiency is 40%receives heat at 500 KIf its efficiency is 50% - then theintake temperature for the same exhaust temperature is[1995]
24. We consider a thermodynamic systemIf ΔUrepresents the increase in its internal energy and W thework done by the system - which of the followingstatements is true? [1998]
25. The internal energy change in a system that hasabsorbed 2 kcals of heat and done 500 J of work is:[2009]

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