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

Related Mcqs:

1. Temper brittleness of a material can be fairly detected by the ________________ test ?

   A. Fatigue
   B. Notched bar impact
   C. Tensile
   D. Hardness

2. Propulsion of rocket follows from the_________________?

   A. Newton’s second law of motion
   B. Newton’s third law of motion
   C. Law of projectiles
   D. Archimedes principle

3. 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

4. “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

5. The heat capacities for the ideal gas state depend upon the_________________?

   A. Pressure
   B. Temperature
   C. Both A. & B.
   D. Neither A. nor B.

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