Entropy, which is a measure of the disorder of a system, is__________________?

Related Mcqs:

1. 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

2. Entropy is a measure of the _____________ of a system?

   A. Disorder
   B. Orderly behaviour
   C. Temperature changes only
   D. None of these

3. When a system is in equilibrium for all possible processes, the differential or finite change of entropy is__________________?

   A. < 0
   B. > 0
   C. = 0
   D. None of these

4. Entropy change for an irreversible isolated system is__________________?

   A. ∞
   B. 0
   C. < 0
   D. > 0

5. The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for ______________________?

   A. Reversible isothermal volume change
   B. Heating of a substance
   C. Cooling of a substance
   D. Simultaneous heating and expansion of an ideal gas

6. For spontaneous changes in an isolated system (S = entropy) ___________________?

   A. ds = 0
   B. ds <0
   C. ds > 0
   D. ds = Constant

7. High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process ?

   A. Δ H = 0 and ΔS = 0
   B. Δ H ≠ 0 and ΔS = 0
   C. Δ H ≠ 0 and ΔS ≠ 0
   D. Δ H = 0 and ΔS ≠ 0

8. As the entropy of the universe is increasing, day by day, the work producing capacity of a heat engine is_________________?

   A. Not changed
   B. Decreasing
   C. Increasing
   D. Data sufficient, can’t be predicted

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. Entropy is a/an___________________?

    A. State function
    B. Macroscopic property
    C. Extensive property
    D. None of these