The absolute entropy for all crystalline substances at absolute zero temperature is ____________________?

Related Mcqs:

1. “At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero”. This follows from the __________________?

   A. Third law of thermodynamics
   B. Second law of thermodynamics
   C. Nernst heat theorem
   D. Maxwell’s relations

2. Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is_______________?

   A. Superheated vapour
   B. Partially condensed vapour with quality of 0.9
   C. Saturated vapour
   D. Partially condensed vapour with quality of 0.1

3. At absolute zero temperature, the _____________ of the gas is zero?

   A. Pressure
   B. Volume
   C. Mass
   D. None of these

4. Absolute zero temperature signifies the ____________________?

   A. Minimum temperature attainable
   B. Temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in
   C. Temperature of the heat reservoir to which a Carnot engine rejects no heat
   D. None of these

5. Entropy change of mixing two liquid substances depends upon the_________________?

   A. Molar concentration
   B. Quantity (i.e. number of moles)
   C. Both A. and B
   D. Neither A. nor B

6. As the temperature is lowered towards the absolute zero, the value of the quantity (∂ΔF/∂T) approaches________________?

   A. Zero
   B. Unity
   C. Infinity
   D. None of these

7. As the temperature is lowered towards the absolute zero, the value of ∂(ΔF)/∂T, then approaches_______________________?

   A. Unity
   B. Zero
   C. That of the heat of reaction
   D. Infinity

8. A change in state involving a decrease in entropy can be spontaneous, only if ____________________?

   A. It is exothermic
   B. It is isenthalpic
   C. It takes place isothermally
   D. It takes place at constant volume

9. A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1 is_________________?

   A. -1.87
   B. 0
   C. 1.26
   D. 3.91

10. Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is ___________________?

    A. 0
    B. ∞
    C. +ve
    D. -ve