I need the answer as soon as possible Transcribed Image Text: Assist Prof

I need the answer as soon as possible Transcribed Image Text: Assist Prof. Dr. Mohsin AI- Yasiri
18. Spherical and ellipsoidal carbon nanomaterials are referred to as: (a) nanotubes, E
fullerenes, (c) graphene, or (d) quantum dots.
19. The precipitation hardening via intermetallics in Fe-Ni superalloys is occurred due to
presence of: (a) Mo and Cr, (6 Al and Ti, (c) W and Nb, or (d) Co and Cr.
20. The chemical formula of Gama Prime (y’) phase in Ni-based superalloys is: (a) NijAl,
(b) Ni3Ti, (c) Niz (Al, Ti), (d) Ni3Al, Ni3Ti, or Ni3 (Al, Ti), or (e) Ni3Al or Ni,Ti,.
21. It is a very expensive addition but leads to an improvement in the creep strength of
Ni-based superalloys:(a Rhenium, (b) Hafnium, (c) Tantalum, or (d) Molybdenum
22. In shape memory alloys, the most common mechanism for lattice invariant shear
during the growth processes of Martensitic Transformations is: (a) slip, (6) twinning,
(c) both, or (d) none.
23. It is used for replacement of diseased and damaged parts: (a Cardiac pacemaker, (b)
Orthodontic, (c) Catheters, or (d) Artificial hip joint.
24. MMCS reinforced with aligned fibers are stronger and stiffer when the direction of
applied load is: (a) perpendicular to the direction of the fibers, (6 in the same
direction of the fibers, or (c) no effect.
25. At elevated temperatures, nanophase ceramics are more: (a) brittle, (b) ductile, or (
no effect.

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