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### Conceptual question for Thermodynamics

PART 4

1. The amount of energy radiated by a body depends on
a.The nature of the surface
b. The area of the surface
c. Temperature of the surface
d. all the above

2. The wavelenght of the radiation emitted by the body depends on
a.The nature of the surface
b. The area of the surface
c. Temperature of the surface
d. all the above

3.A solid sphere and a hollow sphere of same material and size are heated to the same temperature and allowed to cool in the same surounding.If the temperature diffrence between the sphere and surrounding is T.then
a. Both sphere will cool at the same rate for all values of T
b Hollow sphere will cool faster for all values of T
c. Solid sphere will cool faster for all values of T
d. Both sphere will cool at the same rate for small values of T

4. An ideal black body is thrown in the furnace.It is observed that
a. Intially it is the darkest body and at later times the brightest
b. it is the darkest body all the times
c. It cannot be distinguish at all the times
d. Intially it is the darkest body and at later times It cannot be distinguish

5.In which of the following process,convection does not takes place
a. sea and land breeze
b.boiling of the water
c.heating air around the furnace
d.warming of glass of bulb due to filament

6.One end of a metal rod is kept in a furnace.In steady state,the temperature of the rod
a. Increase
b decrease
c. remains constant
d is non uniform

7 what is true for black body
a e=a=1
d none of the above

a. all bodies emit radiation at all temperature
b. Good reflectors are good emitters of thermal radiation
c. Thermal radiation travel in free space with the velocit of light
d. Thermal radiation are not reflected from the mirror

Solutions

PLease take a look at other parts also
Conceptual Questions Part 1
Conceptual Questions Part 2
Conceptual Questions Part 3

### Conceptual question for Thermodynamics

PART 3

1.In a given process of an ideal gas,dW=0 and dQ<0 ,then for a gas
a.dT <0
b. dV>0
c.dP=0
d. dT>0

2.what is true for a free expansion process
a. dW=0
b. dQ=0
c. dU=0
d. all the above

3. Consider the following two statement
A.If heat is added to the system,it temperature must increase
B.If dW >0 then dV >0
a A & B both are correct
b A is correct only
c. B is correct only
d A &B both are wrong

4.what is true of Isothermal process
a. dT>0
b. dT=0
c. dQ=dW
d. none of the above

5. if dU=-dW for a process,the process is
b. Isothermal
c. Isobaric
d. None of the abobe

6.What is true of a cyclic process
a.ΔQ=ΔW
b ΔU=0
c.ΔU >0
d None of the above

7. An ideal gas is taken from state A(P,V) to state B(P/2,2V) along a straight line path in P-V diagram.Select the correct statement from the following
a.The workdone by the gas in process A to B exceeds the work that would be done by it if the system were taken from A to B along a isotherm
b.in the T-V diagram ,the path AB becomes a part of a parabola,
c. In the P-T diagram,the path becomes a part of a parabola
d.In going from A to B,the temperature T of the gas first increase to a maximum and then decrease

8.Let W1,W2 are the workdone in the two process A & B by an ideal gas.ΔTA=ΔTB. Let CA and CB are the molar heat capacities in two process
Also W1 > W2. whic of the following is correct
a.CA=CB
b.CA < CB
c. CA > CB
d None of the above.

9.which of the following is correct
a. Molar heat capacity is 0 for PVy=Constant
b. Molar heat capacity is infinity in adiabatic process
c. Internal energy does not change in Isothermal Process
d. All the above

10.An ideal gas is taken from state A(P1,V1) to state B(P2,V2) by two method X & Y..which of the following is correct
a.ΔQ1-ΔW1=ΔQ2-ΔW2
b.ΔU1=ΔU2
c. ΔQ1+ΔW1=ΔQ2+ΔW2
d. None of the above

Solutions

Please take a look at other parts also
Conceptual Questions Part 1
Conceptual Questions Part 2
Conceptual Questions Part 4