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1mark questions12 Thermodynamics T, =0, Both of them are not possible.
6. Derive the relation C -C =R where C, andC
1.State first law of thermodynamics. (March 2019) are molar specific heat capacities of an ideal g
If an amount of heat AQ is added to a system, a part at constant pressure and volume respectively201
an
of it may increase its internal energy by an amount R is the universal gas constant. (SAY
AU, while the remaining part may be used as the According to first law of thermodynamics
external work AW done by the system on the envi AQ = AU+PAV
ronment. .. AQ = AU + AW PAV
AQ AU PAV
2. The work done during an isochoric process is
AT AT
+
AT
’C,-C,+
(Model 2018)
Zero By gas equation PV = RT ----- (1)
3. (a) Heat engine is a device used to convert After heating P(V+AV) = R (T+ AT) -- (2)
energy into ----energy. (March 2016)
eq. (2) - eq. (1) PAV= RAT
Heat energy to mechanical energy. RAT
:C= C+R
G=C + AT
2mark questions
4, (a) State first law of thermodynamics. ..C-C, =R.
(b) An electric heater supplies heat to a system at 1. A hole is drilled in a copper sheet. The diamet
a rate of 100 J/s. If the system performs work of the hole is 4.24 cm at 27°C. What is the chang
at a rate of 75 J/s, caleulate the internal energy in diameter of the hole when the sheet is heated
increased. (Model 2020)
(a) If an amount of heat AQ is applied to a system,
227°C? (Coefficient of linear expansion of copp
= 1.7 x 105 /C). (March 2016)
a part of it may increase its internal energy by an
amount AU, while the remaining part may be used 4-1,(1+ At) Or c
as external work AW done by the system. l× At
(b) AQ = 100 J/s, AW= 75 J/s 1,=4.24 (1+1.7 x 10-5 x 200) =4.2544 cm
AU= AQ AW= 100 75 = 25 J/s. Al=1,-1,= 0.0144 cm.
3. Heat engine is a device which converts heat
energy into mechanical energy. 3mark questions
(4) Name the processes in a Carnot's cycle. 8. Observe the given figure.
(b) Can you design an engine of 100% efficiency?
Justify your answer. (Model 2020)
Hot Cold
(a) Isothermal expansion, adiabatic expansion, iso Reservoir Reservoir
thermal compression, adiabatic compression.
(b) No. Justification: It is not possible to convert the
entire heat input to work output and there will be (a) Is this a heat engine or refrigerator?
friction losses. (b) Write the 4steps of operation in the Carnot cy
cle. (March 2020)
Orn=1-.If
T
efficiencyn = 1, then T,=0 or (a) Heat engine
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