Thermodynamics-Quiz-2

Thermodynamics Quiz

Dear Readers,

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.  The pressure and density of a diatomic gas (γ=7/5) change adiabatically form (p_1,d_1)to (p_2,d_2). If d_2/d_1 =32, then p_2/p_1 is:

•  1/128
•  32
•  128
•  256

Solution

Q2.One mole of a monoatomic gas (γ=5/3) is mixed with one mole of a diatomic gas (γ=7/5). What will be value of γ for the mixture?:

•  1.5
•  1.54
•  1.4
•  1.45

Solution

Q3.  A gas mixture consists of 2 moles of oxygen and 4 moles argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is:

•   4RT
•  15RT
•  9RT
•  11RT

Solution

Q4. Figure shows a cyclic process ABCA for an ideal diatomic gas. The ratio of the heat energy absorbed in the process A→Bto the work done on the gas in the in the process B→C is

•  
  
•  
  
•  
  
•  
  

Solution

Q5. A diatomic ideal gas is compressed adiabatically to 1/32 of its initial volume. In the initial temperature of the gas is T_f(in kelvin) and the final temperature is T_f, the value of a is

•  4
•  6
•  5
•  9

Solution
a 

Q6. 5 moles of Hydrogen (γ=7/5) initially at S.T.P. are compressed adiabatically so that its temperature becomes 400°C. The increase in the internal energy of the gas in kilo-joules is: (R=8.30 J mol^(-1) K^(-1))

•  21.55
•  41.50
• 65.55
•  80.55

Solution

Q7. 5.6 L of helium gas at STP is adiabatically compressed to 0.7 L. Taking the initial temperature to be T_1, the work done in the process is:

•  9/8*RT
•  3/2*RT
•  15/8*RT
•  9/2*RT

Solution

Q8. P-V plots for two gases during adiabatic processes are shown in Fig. Plots 1 and 2 should correspond respectively to:

•  He and O_2
• &nbspO_2 and He
•  He and Ar
•  O_2 and N_2

Solution

Q9. A balloon is filled with a mixture of ideal gases. The pressure P in the balloon is related to the volume Vas PV^(2/3)=k, where k is a constant. If T is the temperature of the mixture, volume V is proportional to:

•  T
•  T^2
•  T^3
•  T^4

Solution

Q10. A certain amount of heat energy is supplied to a monoatomic ideal gas which expands at constant pressure. What fraction of the heat energy is converted into work?:

•  1
•  2/3
•  2/5
• 5/7

Solution