UPSC Recruitment Paper 2017 : Post of Senior Scientific Officer Grade-II (Metallurgy) in Ministry of Defence

UPSC Recruitment Paper 2017 : Post of Senior Scientific Officer Grade-II (Metallurgy) in Ministry of Defence

1. The equilibrium in multi-component systems has not been derived, to avoid:
(a) Elaboration and complexity
(b) Simplicity
(c) Elaboration
(d) Mathematical equation

2. Quasi chemical theory helps to understand:
(a) The qualitative behaviour of solution
(b) The qualitative behaviour of solvent
(c) The qualitative behaviour of solute
(d) The chemical reaction

3. The Gibbs-Duhem equation is very useful to:
(a) Evaluate the activity of a component in solution when that of the other component is known
(b) Evaluate the activity of a component in solution when that of the other component is not known
(c) Evaluate the activity of a component in solution and is very easy
(d) Measure the activity accurately 

4. What is the entropy change for the reaction as below at 298 KK?
fe₂o₃ + 3C = 2 Fe + 3 CO
Given the standard values of entropies at 298 K for the following elements/compounds:

(a) 27.16 cal/mole
(b) 47.3 cal/mole
(c) 30.82 cal/mole
(d) 37.26 cal/mole

5. The free energy of the reaction: < CaCO₃ > = < CaO > +{CO₂} is,
 ∆ G⁰ = +40250 − 34.4 T Cal/g mol
What is the minimum temperature at which the reaction will occur?
(a) 789°C
(b) 879°C
(c) 897°C
(d) 910°C

6. Fractography is evaluated by:
(a) X-ray Diffraction
(b) X-ray Fluorescence Spectroscopy
(c) Scanning Electron Microscopy
(d) Transmission Electron Microscopy

7. X-ray Diffraction technique is used to determine:
(a) Grain size of cold-worked material
(b) Inclusion content in steel
(c) Microstructure of metal
(d) Curie temperature of magnetic material

8. In solid solution strengthening, which mechanism is relatively insensitive to temperature?
(a) Stacking - fault interaction
(b) Elastic interaction
(c) Electrical interaction
(d) Short-range order interaction

9. Which of the following is a sessile dislocation?
(a) Shockley partial dislocation
(b) Frank partial dislocation
(c) Edge dislocation
(d) Screw dislocation

10. In ductile metals, the Bauschinger effect causes lowering of:
(a) Tensile stress
(b) Fracture stress
(c) Elastic Modulus
(d) Yield stress

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Courtesy:UPSC