Propulsion of rocket follows from the_________________?

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. The combustion equations of carbon and carbon monoxide are as follows: C + O2 = CO2, ΔH = – 394 kJ/kg .mole CO + ½ O2 = CO2, ΔH = – 284.5 kJ/kg. mole. The heat of formation of CO is _____________ kJ/kg. mole?

   A. -109.5
   B. +109.5
   C. +180
   D. +100

3. Between 230 and 370°C, blue brittleness is caused in mild steel because of the_________________?

   A. Immobility of dislocation
   B. Strain-ageing
   C. Increase in Young’s modulus
   D. Strain hardening

4. The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the_________________?

   A. Ionosphere
   B. Troposphere
   C. Stratosphere
   D. None of these

5. “The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances”. This is the_________________?

   A. Lewis-Randall rule
   B. Statement of Van’t Hoff Equation
   C. Le-Chatelier’s principle
   D. None of these

6. The unit of fugacity is the same as that of the_________________?

   A. Pressure
   B. Temperature
   C. Volume
   D. Molar concentration

7. Second law of thermodynamics is concerned with the_________________?

   A. Amount of energy transferred
   B. Direction of energy transfer
   C. Irreversible processes only
   D. Non-cyclic processes only

8. In a homogeneous solution, the activity co-efficient of a component depends upon the_________________?

   A. Pressure
   B. Composition
   C. Temperature
   D. All (A), B. and (C)

9. 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

10. A chemical process is said to occur under unsteady state, if the_________________?

    A. Inventory changes do not take place
    B. Ratio of streams entering/leaving are independent of time
    C. Flow rates & composition both are time dependent
    D. None of these