# Past Papers Thermodynamics and Kinetic Energy

[OBJECTIVE]

Subject: Thermodynamics and Kinetic Energy

Time Allowed: 15 Minutes

Max Marks: 10

NOTE: Attempt this Paper on this Question Sheet only. Please encircle the correct option. Division of marks is given in front of each question. This Paper will be collected back after the expiry of time limit mentioned above.

Part-I  Answer the following Questions, cutting and overwriting are not allowed. (10)

Why does the glass sometimes break if you quickly pour boiling water into it?

a) Hot water expands, pushing the glass out

b) Hot water cools when it touches the glass

c) The glass becomes hot and expands, causing the molecules to break

d) The inside of the glass expands faster than the outside of the glass, causing the glass to break.

Which has the higher mass density at same temperature and pressure.

a) Dry air b) Humid air

c) Both have same d) Other conditions needed to be mentioned

Which of the following is not a State Function of the system

a) Pressure b) Temperature

c) Internal Energy d) Work

In Carrot Engine, Internal Energy in one Cycle is

a) Positive b) Negative

c) Constant d) Zero

The Efficiency of the Carrot engine in terms of T1and T2 is

a) 1-(T2/T1)

b) 1-(T1/T2)

c) 1+(T2/T1)

d) 1+(T1/T2)

The density of gas in a bell jar is kept constant while varying the temperature, if the temperature is doubled, then the mean free path will

a) Double b) Remain the same

c) Decrease by half d) Becomes four times

7. Which type of ideal gas will have the largest value of Cp/C,

a) Monoatomic b) Diatomic

c) Polyatomic d) The value will be the same for all

8. Which of the following is a necessary condition for a process involving an ideal gas to do work

a) ∆T ≠ 0 b) ∆P ≠ 0

c) ∆V ≠ 0 d) Q ≠ 0

A block of Aluminum originally at 80°C is placed into an insulated container of water originally at 25° C , After a while the system reaches an equilibrium temperature of 31°C, During the process

a) Change in entropy of Aluminum block is positive

b) Change in entropy of Aluminum Hock is negative

c) Change in entropy of Aluminum block is zero

d) None of the above

Work done in an adiabatic process is than that in isothermal process

a) Greater b) Smaller

c) Equal d) Zero

[SUBJECTIVE]

Subject: Thermodynamics and Kinetic Energy

Time Allowed: 2 Hours 45 Minutes

Max Marks: 50

NOTE: ATTEMPT THIS (SUBJECTIVE) ON SEPARATE ANSWER SHEET PROVIDED

Part-II  Give Short Answers, Each question carries equal marks. (20)

Q#1: State the two forms of zeroth law of thermodynamics

Q#2: Write conversion formulae between Fahrenheit and Kelvin Scales.

Q#3: Write the expressions for the van der Waals equation of state of real gases. And write the reason for volume correction.

Q#4: Define the linear Coefficient of thermal expansion in solids and relate it to the corresponding coefficient of volume expansion.

Q#5: Explain the strange behavior of volume expansion of water in the temperature range  0-4°C

Q#6: Write the statements of the second law of thermodynamics in terms of Entropy ii) Heat engine.

Q#7: Define the latent heat of i) Fusion ii) Vaporization Also write the respective units

Q#8: Write the expressions for the following thermodynamic potentials mentioning the quantities involved

i) Helmholtz Free Energy

ii) Gibbs Free energy

Q#9: Derive any one of the Maxwell thermodynamic relations.

Q#10: The turbine in the steam power plant takes steam from a boiler at 600°C temperature reservoir and rejects at 60°C, calculate its efficiency.

Part-III  Give Long Answers, Each question carries equal marks. (30)

Q#1: Derive the following expressions considering one mole of the ideal gas to be the thermodynamic system under consideration with the standard notations for the quantities:

i) PVy = Constant

ii) Cp-Cv = R

Q#2: What do you mean by thermoelectricity and thermocouple, Explain the Seebeck Effect and Peltier effect.

Q#3: Derive the first and the second TdS equations and explain one application in each case.