## Thermodynamics Quiz

Important topics for Thermodynamics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with the day-to-day experiences.

Q1. Starting with the same initial conditions, an ideal gas expands from volume V_1 to V_2 in three different ways. The work done by the gas is W_1 if the process is purely isothermal, W_2 if purely isobaric and W_3 if purely adiabatic. Then:
•  W2>W1>W3
•  W2>W3>W1
•  W1>W2>W3
•  W1>W3>W2
Solution

Q2.Two moles of ideal helium gas are in a rubber balloon at 30℃. The balloon is fully expandable and can be assumed to require no energy in its expansion. The temperature of the gas in the balloon is slowly changed to 35℃. The amount of heat required in raising the temperature is nearly (take R=8.31 J/mol.K):
•  62 J
•  104 J
•  124 J
•  208 J
Solution

Q3.  A closed hollow insulated cylinder is filled with gas at 0°C and also contains an insulated piston of negligible weight and negligible thickness at the middle point. The gas on one side is heated to 100°C. If the piston moves through 5 c m, the length of the follow cylinder is:
•   13.65 cm
•  27.3 cm
•  38.6 cm
•  64.6 cm
Solution

Q4. The isothermal Bulk modulus of an ideal gas at pressure P is
•  P
•  yP
•  P/2
•  P/y
Solution

Q5. If the ratio C_p/C_v = Î³, the change in internal energy of the mass of a gas, when the volume changes from V to 2 V at constant pressureP is
•
•
•
•
Solution

Q6. The equation of state of a gas is
Where a,b,c and Rare constants. The isotherms can be represented by
Where A and B depend only on temperature and
•  m = -c,n = -1
•  m= c, n =1
• m= -c, n=1
•  m= c,n= -1
Solution

Q7. Heat energy absorbed by a system in going through a cyclic process shown in Fig. is
:
•
•
•
•
Solution

Q8. If 2 moles of an ideal monoatomic gas at temperature T are mixed with 3 moles of another monoatomic gas at temperature 2T, the temperature of the mixture will be:
•  8T/5
•  6T/5
•  4T/3
•  3T/2
Solution

Q9. An ideal gas is initially at temperature T and volume V. Its volume is increased by ∆V due to an increase in temperature ∆T, pressure remaining constant. The quantity Î´=∆V/(V ∆T) varies with temperature as (see Figs.):
•
•
•
•
Solution

Q10. In a certain process, pressure P, volume V and temperature T of a gas are related as PV=kT^n where k and n are constants. The work done by the gas when the pressure is kept constant, is proportional to:
•  (T)^1/n
•  (T)^n
•  (T)^(n+1)
• T^(n-1)
Solution

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